2017-2019 6.7L Powerstroke Filter Kit Guide: FD4625, FL2051S, FA1927

The $12,000 Tow Truck You Didn’t Order

December 2025. Flagstaff, Arizona. 19 degrees. My cousin’s 2018 F-350 King Ranch — a truck he’d bought six months earlier with 82,000 miles — shut down on I-40 while towing a 14,000-pound fifth wheel.

No warning. No limp mode. Just silence at 70 mph.

The diagnosis from the Flagstaff Ford dealer: CP4.2 catastrophic failure. Metal shavings from the pump’s disintegrated roller tappet had traveled through every high-pressure line, all eight injectors, and the fuel rail. The estimate? $11,847.32. Cab-off repair. One week minimum.

The root cause wasn’t mysterious. The previous owner had installed a no-name Amazon filter kit — FD4625 lookalikes with collapsed media and a torn O-ring. Water had sat in the fuel bowl for months, the pump’s internals had rust-pitted, and when that roller tappet finally let go at 2,500 RPM on the highway, it took the entire fuel system with it.

This was a 2017–2019 truck — arguably Ford’s most refined 6.7L Powerstroke generation before the 2020 redesign. Aluminum body, 450 hp, 935 lb-ft from the factory. These trucks are too good to die from a $40 filtration mistake.

If you own a 2017–2019 Super Duty, this guide will tell you exactly what filters you need, how they compare to the competition down to the dollar, and how to install them in your driveway this weekend.

Why the 2017–2019 6.7L Powerstroke Filter Kit Matters

The CP4.2 Refinement — and Its Fatal Flaw

The 2017–2019 6.7L Powerstroke retained the Bosch CP4.2 high-pressure fuel pump from the 2011–2016 generation, but with revised calibrations for the 450 hp / 935 lb-ft output. The fundamental vulnerability didn’t change: this pump runs at 30,000 PSI, uses diesel fuel as its only lubricant, and has internal clearances measured in single-digit microns.

What did change in 2017 is the fuel filtration design:

• FD4625 replaced FD4615: The dual-stage fuel filter set was redesigned with improved water separation media and a revised frame-mounted housing connector. FD4625 and FD4615 are not interchangeable — the connectors are keyed differently.

• FA1927 cylindrical air filter replaced FA1902 panel: The 2017+ trucks switched from a flat panel air filter to a cylindrical element with an outer foam pre-filter. This was driven by the higher airflow demands of the 450-hp tune and improved dust capture for the twin-turbocharger system.

• Same FL2051S oil filter: The oil filtration remained unchanged from 2011–2016, using the same spin-on canister with silicone anti-drainback valve.

What Separates Quality Filters From Budget Junk

When you see a “complete 3-piece kit” for $42 on eBay, here’s what you’re actually buying:

Feature	TruckTok Kit	Budget Sub-$50 Kit
Fuel filtration	4-micron @ 99% (ISO-tested)	Claimed 5-micron, no test data
Water separation	Dual-stage coalescing media	Single-stage, minimal water stripping
Oil filter ADBV	Silicone (−40°F to 400°F)	Nitrile (hardens after 3 heat cycles)
Air filter pleat count	98+ pleats, foam pre-filter included	60–72 pleats, no pre-filter
O-ring material	Viton (diesel-rated, won’t swell)	Buna-N (absorbs diesel, swells, leaks)
Frame housing connector	Keyed to exact FD4625 spec	Generic mold, may not seat properly
QA	ISO 9001, batch-tested	Unknown factory, no traceability

The 2017+ fuel system is even less forgiving than the 2011–2016. The revised injectors run at higher rail pressure, and a collapsed filter element that restricts flow at 30,000 PSI doesn’t just starve the pump — it cavitates it. Cavitation damage to the CP4.2’s roller tappet is invisible until it’s catastrophic.

Real-Time Competitor Price Comparison

We searched Amazon, eBay, and diesel specialist sites for 2017–2019 6.7L Powerstroke filter options. Data compiled as of July 21, 2026.

Complete 3-Piece Kits (Fuel + Oil + Air)

Brand	Price	Rating	Reviews	Contents	Notes
TruckTok	$111.60	—	—	FD4625 fuel + FL2051S oil + FA1927 air w/foam pre-filter	ISO-tested, silicone ADBV, Viton O-rings, correct FL2051S oil filter for 2017–2019
YZQPNB	$56.99	4.6★	91	FD4625 + FL2124S + FA1927	Wrong oil filter! FL2124S is for 2020+ — incorrect for 2017–2019
Doc’s Diesel 4-Piece Combo	$137.99	4.8★	80	DFD4625 + D6128 + DPA10580 + D3806	Premium 4-piece kit — $26 more than TruckTok for unknown-branded internals
RARAYC 2-Piece	$49.99	4.7★	144	FD4625 + FA1927	Missing oil filter completely — fuel + air only, no FL2051S

OEM Motorcraft Individual (Priced July 2026)

Part	Motorcraft Price	Source
FD4625 Fuel Filter (dual-stage)	$99.95	Ford dealership average
FL2051S Oil Filter	$31.99	Amazon / Walmart
FA1927 Air Filter (cylindrical with foam)	$59.95	Ford dealership / Amazon
OEM Total	$191.89	Three separate purchases

eBay Fuel-Only Kits (FD4625)

Listing	Price	Sold
1 Kit FD4625 (fuel only)	$24.29–$37.99	435+
2-Pack FD4625	$51.42 ($25.71/ea)	63+
6-Pack FD4625 bulk	$142.49 ($23.75/ea)	47+

Key Takeaways from the Data (Live Amazon Prices, July 21 2026)

1. TruckTok at $111.60 saves 42% vs. Motorcraft OEM ($191.89): Same micron ratings, same fitment, one box, one shipment. Doc’s Diesel 4-piece is actually more expensive at $137.99 — you’d pay a premium for extra pieces you may not need.

2. The $56.99 YZQPNB kit has a fatal oil filter error: It includes FL2124S — that’s a 2020+ 6.7L oil filter. Wrong thread pitch, wrong bypass pressure for 2017–2019. At 4.6★ / 91 ratings, most buyers likely never noticed the mismatch until their next oil change. Don’t be that person.

3. The $49.99 RARAYC “kit” is missing the oil filter: Despite 4.7★ and 144 ratings, this is a 2-piece (fuel + air only). You’d still need to buy a separate FL2051S, pushing your actual cost to ~$82. Suddenly the $111.60 TruckTok kit looks like the simpler math.

4. Doc’s Diesel single fuel filter ($59.99, 4.5★, 609 ratings) has the most reviews — but it’s one piece: To build a full 3-filter set à la carte from Doc’s, you’d spend $59.99 (fuel) + ~$35 (oil) + ~$30 (air) = ~$125. Still more than TruckTok, with three separate orders.

5. eBay bulk FD4625 at $23.75/piece isn’t worth the gamble: Unbranded imports with zero micron-rating certification. One collapsed fuel filter element sends metal into your injectors at 30,000 PSI. There is no “budget” option for CP4.2 protection.

6. The FA1927 foam pre-filter is the quiet differentiator: Several Amazon air filter listings at $26.99–$27.99 (4.5★, 132–344 ratings) look fine for a standalone air filter — but if the foam outer wrap is missing or poorly adhered, fine dust bypasses the pleated media at highway speeds. The TruckTok FA1927 includes the OEM-spec foam layer.

Cold Climate CP4.2 Protection — Why Water Matters More Than Price

If you live anywhere that sees freezing temperatures, this section is the most important thing you’ll read today.

Water enters diesel fuel through condensation inside your tank — especially during temperature swings (warm day, cold night). The HFCM water separator captures it, but if you push fuel filter intervals past 20,000 miles in a cold climate, the water accumulates faster than the separator can handle. What happens next is ugly:

1. Water gels inside the filter media at freezing temps, restricting flow to the CP4.2 high-pressure pump. The pump starts pulling vacuum against a clogged filter.
2. Cavitation begins — microscopic vapor bubbles implode against the roller tappet.
3. Metal flakes circulate through the injectors at 30,000 PSI. Game over.

This isn’t theoretical. It’s the #1 cold-weather failure mode for 6.7L Powerstrokes, and it’s 100% preventable with one habit: change fuel filters every 15,000–20,000 miles in winter. Not 30,000. Not “when I get around to it.” Every two to three oil changes, minimum.

If you’re in Florida, Texas, or Arizona — you have more margin. The water still accumulates, but it stays liquid and the separator drains it more effectively. You can push to 20,000–25,000 miles with quality filters. Cold-climate owners don’t have that luxury.

8-Step DIY Filter Installation (2017–2019 6.7L)

Tools You’ll Need

Tool	Spec	Used For
32mm socket	6-point, deep	Frame-mounted fuel filter cap (2017–2019 confirmed 32mm)
3/8" ratchet + extension	Standard	Socket drive
Oil filter wrench	93mm or strap-type	Spin-on oil filter
Drain pan	5-gallon minimum	Oil + fuel drainage
Torque wrench	10–50 Nm range	Oil pan plug, filter cap
Flathead screwdriver	Small	Air filter housing latches + fuel line clip release
Pick tool	Small, angled	O-ring removal from filter cap grooves
Old rags	3–4 shop towels	Stuff around filter housing to catch fuel (non-negotiable)
Nitrile gloves	Heavy-duty	Diesel is a skin irritant
Safety glasses	ANSI Z87.1	Fuel splash protection
Diesel-rated catch container	2+ quarts	HFCM water separator drain

Before You Start

• Warm the engine for 5 minutes. Warm oil drains faster; warm fuel flows through the HFCM drain more completely.
• Park on level ground. Critical for accurate oil refill.
• Chock the rear wheels. You’ll be underneath the driver-side frame rail.
• Have rags ready — 3 or 4 of them. Stuff them around the top fuel filter housing before disconnecting any lines. The frame-mounted filter will spill diesel. No amount of experience fully prevents it.

Step 1: Drain the HFCM Water Separator

The Horizontal Fuel Conditioning Module (HFCM) sits on the driver-side frame rail, roughly under the driver’s seat. The 2017–2019 uses the same basic HFCM design as earlier trucks, with a yellow twist-knob petcock on the side.

1. Unplug the water-in-fuel sensor connector on the side of the HFCM. Press the tab and wiggle it off. Route the wire clear of your work area. 💧 Two drain methods — both work:

Method A (3-turn check valve — recommended): With the petcock still CLOSED, use your 32mm socket to loosen the HFCM cap 3 full turns. Do NOT remove it yet. Those 3 turns engage the internal check valve that shuts off the diesel supply from the tank. Now open the yellow twist petcock and drain only the small volume inside the housing.

Method B (quick drain — shown in most YouTube installs): Skip the 3-turn step. Open the yellow twist petcock by hand and let the full housing drain. Expect over a gallon of diesel if the tank is full — use a 5-gallon bucket, not a small catch pan. This can take longer (the trickle-stop-trickle pattern means the housing is slowly pulling from the tank), but thousands of owners do it this way without issue.

Which to pick: Method A saves a gallon of diesel and reduces air in the supply line. Method B is simpler. Both get the job done.

Step 2: Replace the Primary Fuel Filter (Frame-Mounted)

1. With the housing drained and petcock closed, remove the 5 bolts — 3 bolts toward the front of the truck, 2 bolts toward the rear. An 8mm socket on a ratchet with an extension is ideal; the extension lets the ratchet clear the frame rail.
2. Lower the housing. The filter element is keyed: look for an arrow stamped into the plastic labeled “REMOVAL” and another labeled “INSTALL.” Push the housing in the direction of the REMOVAL arrow, then pull it straight up and out.
3. Note the orientation: the side with the grid/screen faces the two-bolt side of the housing. The square port on the filter goes toward the two-bolt side. If you forget, the arrows tell the story.
4. Inspect the old FD4625: look for collapsed pleats, sludge, or discoloration. If you see metallic flakes, stop — your fuel system needs professional evaluation. Bubbles in the residual fuel at the bottom of the housing are water — if you see a heavy bubble layer, you’re overdue and may need to shorten your interval.
5. Remove the old gasket from the housing. Use a pick tool or small flathead to catch the edge. Clean the gasket groove thoroughly with a rag.
6. Install the new gasket — it’s a rib-design gasket that holds itself in the groove. Alignment trick: Look for a small circle molded into the gasket; line it up with the corresponding finger-shaped tab inside the housing groove. Push down, then push toward the two-bolt side until you hear the click. Then lube it with a dab of clean diesel fuel.
7. Install the new FD4625 primary filter. Drop it in following the INSTALL arrow direction. The square side faces the two-bolt side.
8. Slide the housing back up, start all 5 bolts by hand, then run them up. Tighten by hand with the ratchet only — do not use the impact gun to tighten. The housing is plastic with a large gasket. As soon as the bolts bottom out, give them a quarter-turn snug and stop.
9. Close the petcock if still open. Reconnect the water-in-fuel sensor.

🛠 Torque wisdom from installers who’ve done hundreds of these: “The housing has a big huge gasket and it’s all plastic — you don’t get it super tight. As soon as it bottoms and stops, maybe a little quarter turn, snug them up.” Over-tightening cracks the threads. If it leaks after a quarter-turn past bottomed, the gasket isn’t seated — not that you need more torque.

Step 3: Replace the Secondary Fuel Filter (Engine-Mounted)

The secondary fuel filter sits on top of the engine, driver’s side, near the intake manifold. It uses a twist-lock design — no socket needed. There are three hoses to disconnect (not two — this is a common mistake in written guides).

1. Remove the engine cover (if equipped). Two 10mm bolts at the front.
2. Stuff rags around the housing. Fuel will spill from each hose you disconnect, and the hose closest to the firewall dumps the most.

🟡 Model year variations: Clip colors are not consistent across 2017–2019. 2017 models typically use Red + Orange. 2018–2019 models often use Red + Blue + Orange/Green. Focus on the release mechanism, not the color.

3. Disconnect the three hoses — each one requires a different technique:

   • Hose 1 — Red clip (closest to you): Two small clips on the bottom of the connector. Squeeze them together with your fingers, push the tab down, then pull the connector straight out.

   • Hose 2 — Blue or Orange clip (middle): Larger connector — this is the one that dumps the most fuel. Pull the tabs toward you first, then squeeze the body together to release. Most installers call this one “kind of a booger” — it’s the trickiest of the three. Don’t yank on the hose — those clips are flimsy plastic and break easily. Replacement connectors are expensive and hard to source.

   • Hose 3 — Orange/Green or Orange (closest to firewall): The easiest one. Pull up on the tabs, squeeze both sides inward, and it pulls right off — no screwdriver needed.

4. With all three hoses disconnected, twist the housing counterclockwise until it hits the stop, then pull straight up. The cap and filter come out as one assembly.

5. Remove the old filter element from the cap. Install the new FD4625 secondary filter — it comes pre-assembled in its own housing. Simply discard the old unit, drop the new one in, and listen for the click when it seats and locks into place. It only fits one way, with the open end facing up into the housing.

6. Replace the small O-ring on the cap. This is the smaller O-ring from the FD4625 kit — the larger one went on the frame-mounted cap in Step 2.

7. Reinstall the assembly: insert at a slight angle, tilted away from the hoses, until it seats fully. Pull the hoses back slightly and twist clockwise until the hose ports line back up with the connectors.

⚠️ Reconnecting the hoses — the part most people get wrong: Each hose connector has a molded reference line on the fitting. The connector must be pushed past that line before you push the locking tab down. Then do the tug test — pull on each hose firmly. If it slips off, it wasn’t seated past the line. The guy in the video demonstrated this perfectly: his middle hose looked connected and the clip was down, but a tug pulled it right off — it hadn’t cleared the line. A fuel leak at the top filter means a no-start or, worse, a fire risk on a hot engine.

Step 4: Replace the Oil Filter

1. Position your 5-gallon drain pan under the oil pan drain plug.
2. Remove the oil fill cap on top of the engine to allow air flow.
3. Remove the oil pan drain plug with a 15mm socket. Let it drain completely — 10–15 minutes.
4. While the oil drains, move to the oil filter on the passenger side of the engine block.
5. Use a 93mm oil filter wrench or strap wrench to spin the old FL2051S counterclockwise.
6. Once loose, unscrew by hand. Tip it upright immediately — the FL2051S holds nearly a quart of oil.
7. Clean the mounting surface on the engine block with a rag.
8. Apply a thin film of clean oil to the new filter’s rubber gasket.
9. Spin the new FL2051S on by hand until the gasket contacts the mounting surface. Then tighten an additional 3/4 to 1 full turn by hand. Do not use a wrench.
10. Reinstall the drain plug with a new crush washer. Torque to 35 Nm (26 lb-ft).
11. Refill with 13 quarts of 10W-30 or 5W-40 diesel-rated oil (check your owner’s manual for the correct viscosity for your climate).

Step 5: Replace the FA1927 Cylindrical Air Filter

The 2017+ cylindrical air filter is mounted in a sealed air box on the passenger side of the engine bay. This is distinct from the flat-panel FA1902 used on 2011–2016 trucks. The swap takes under 3 minutes — it’s the easiest of the three filters in this kit.

1. Release the four spring clips on the air filter housing lid. Two on the front face, one on the right side, one at the rear. Flip each outward.
2. Lift the lid straight up. The cylindrical FA1927 sits vertically in the lower housing.
3. Lift out the old filter. Wipe the inside of the housing with a clean rag — remove any dust, leaves, or sand.
4. Inspect the foam pre-filter on the old unit. If it’s packed with fine dust, that’s the foam doing its job — it captured what the pleats would have missed. This is your visual proof that the foam layer matters.
5. Orient the new FA1927 with the foam side facing the rear of the housing (toward the firewall). The filter base has two alignment holes that seat onto two plastic pins molded into the bottom of the housing — if it won’t sit flush, rotate it 180°.
6. Lower the lid and secure all four clips. Push each one until it snaps fully engaged — a loose clip lets unfiltered air bypass the filter entirely.

Pro tip: The FA1927 foam pre-filter is washable. During dusty driving seasons (harvest, construction zones, desert towing), pop the filter out between oil changes and gently tap or compressed-air-blow the foam. Don’t wash with water — it degrades the foam. As one diesel owner on YouTube put it: “Filters are cheap, engines ain’t — so I change 'em when I can.” Every 15,000–18,000 miles is a safe interval for most owners.

Step 6: Prime the Fuel System

2017–2019 trucks use an in-tank lift pump. You must cycle the key to prime the fuel system before starting. Do not attempt to start the engine immediately after a filter change — cranking a dry CP4.2 pump is one of the fastest ways to destroy it.

If you have push-button start (no key): Press the start button without your foot on the brake. The dash will illuminate in RUN mode and the fuel pump will cycle for about 30 seconds. Wait until you hear it stop, press the button again to turn OFF, and repeat.

If you have a key: Turn the key to RUN (do not start). Let the pump run, then turn OFF.

1. Run the pump for approximately 30 seconds. You’ll hear it — a faint hum that changes pitch as air purges from the lines.
2. Wait until the pump shuts off. Turn the key OFF (or press start button again to shut off).
3. Repeat 3–5 times. Three cycles is the minimum; five is extra insurance. You’ll hear the pump sound change as air volume decreases — when it’s just a smooth hum without the gurgling, you’re ready.
4. On the final cycle, start the engine.
5. On the final cycle, start the engine.

What to expect:

• First start may crank 2–4 seconds longer. Normal.
• The engine should idle smoothly. If it stumbles or stalls, run 2–3 more prime cycles.
• If the engine cranks but won’t start after 6 cycles: The most common cause is the lower HFCM cap not fully tightened. A loose cap allows air into the system and the CP4.2 won’t build rail pressure. Crawl back under, confirm the cap is at mechanical stop, re-prime.
• Let the engine idle for 2 minutes. Check underneath for fuel or oil leaks — especially at the HFCM cap, petcock, and fuel line clips.
• Air in the high-pressure system makes a distinct metallic ticking sound. If you hear this, shut it off immediately and re-prime. That’s the CP4.2 pumping air, which erodes the internal polished surfaces.

Step 7: Check for Leaks and Do a Final Inspection

1. With the engine idling, inspect all work areas:
   • HFCM cap and petcock: no drips
   • Engine-mounted secondary filter: dry at all fuel line connections
   • Oil filter: no seepage at the gasket
   • Drain plug: dry
   • Air filter housing: all clips secure
2. Check the engine oil level on the dipstick. Top off if needed.
3. Take a short test drive around the block. Come back and re-inspect all connections.

Step 8: Reset the Fuel Filter Life Monitor

The 2017–2019 instrument cluster has separate maintenance monitors for oil and fuel filters.

Fuel filter minder reset:

1. Turn the key to RUN (do not start).
2. Using the steering wheel controls, navigate to: Settings → Vehicle → Maintenance → Fuel Filter
3. Press and hold the OK button until the display reads “Fuel Filters Set to New” or “100%.”
4. Cycle the key to OFF and back to RUN to confirm.

Oil life monitor reset:

1. Turn the key to RUN.
2. Press the brake and accelerator pedals simultaneously and hold.
3. After ~25 seconds, the display resets to “Oil Life 100%.”

The 5 Most Expensive Filter Mistakes 2017+ Owners Make

#1: Running the Wrong Fuel Filter (FD4615 in an FD4625 Truck)

The FD4615 (2011–2016) and FD4625 (2017+) look nearly identical in photos. They are not interchangeable. The frame-mounted housing connector is keyed differently, and forcing an FD4615 into a 2017+ housing cracks the connector. If you’ve been buying “universal 6.7L” fuel filters from an eBay seller who doesn’t distinguish model years, check your part number right now.

#2: Skipping the Foam Pre-Filter on the Air Filter

The FA1927 foam pre-filter isn’t optional decoration. Ford added it because 2017+ trucks generate higher turbocharger inlet velocities, which pull fine dust through standard paper media at a rate the pleats can’t intercept. Budget FA1927 replacements without the foam layer pass 2–3× more particulate to the compressor wheel. Over 50,000 miles, that’s measurable turbine erosion.

#3: Overtightening the Plastic HFCM Cap

The number-one cause of HFCM housing replacement is a cracked cap from overtightening. Hand-tighten to the mechanical stop. Period. If it leaks at the stop, the O-ring isn’t seated — remove, inspect, re-seat. Cranking it with a wrench just spreads the crack further.

#4: Running 15,000-Mile Oil Changes with No Oil Analysis

Ford’s 7,500–10,000 mile oil change interval assumes normal-duty driving. If you tow a fifth wheel, plow snow, idle for hours, or drive in dusty conditions, your oil is shearing down and accumulating soot at 2–3× the normal rate. Get a $30 oil analysis at 5,000 miles to establish your actual change interval — don’t guess based on the manual.

#5: Installing the Fuel Filters Dry (No Priming)

The CP4.2 cannot pump air. It relies on diesel for both lubrication and cooling. Installing new filters and cranking the engine without priming forces the pump to run dry for 5–10 seconds — enough to score the polished roller tappets. Always prime 3–5 key cycles before the first start (5 if you used the simple drain method).

Symptoms and Troubleshooting: What Your Filters Are Telling You

Symptom	Likely Cause	Action
Long crank before starting (5+ seconds)	Air in fuel system	Run additional prime cycles (Step 6), check HFCM cap tightness
Engine surges or stumbles under load	Clogged air filter or water in fuel	Inspect FA1927 foam pre-filter; drain HFCM and check for water
“Water in Fuel” warning	HFCM water separator full	Drain immediately — water kills CP4 pumps in minutes of runtime
“Change Fuel Filter” message right after install	Filter minder not reset	Follow Step 8 reset procedure
Metal flakes in HFCM housing during drain	CP4.2 component wear	Stop driving. Tow to a diesel shop for fuel system inspection
Fuel smell under truck after filter change	Loose cap or pinched O-ring	Check HFCM cap tightness; inspect O-ring for pinching
Black smoke under acceleration	Restricted air filter	Replace FA1927 immediately
Oil pressure fluctuation at idle	Clogged oil filter bypass valve	Replace FL2051S; cut open old filter and inspect for debris

Frequently Asked Questions

Q1: Can I use FD4615 fuel filters in my 2017–2019 truck?

No. The FD4615 (2011–2016) and FD4625 (2017+) are physically different — the frame-mounted housing connector is keyed differently. Forcing an FD4615 into a 2017+ housing will crack the connector and potentially leak fuel. Always verify the part number on your existing filter before ordering.

Q2: How often should I really change these filters?

Fuel filters: every 15,000 miles or every second oil change (whichever comes first). Oil filter: every 7,500–10,000 miles with each oil change. Air filter: every 30,000 miles under normal conditions, 15,000 miles if you tow frequently or drive in dusty environments. Towing a 14,000-pound fifth wheel? Cut all intervals by 30%. Cold climate exception: If you live where it freezes, fuel filters should never exceed 15,000 miles in winter. Water condensation gels inside the filter media at freezing temps — CP4.2 pumps don’t survive restricted fuel flow.

Q3: Is the TruckTok FD4625 kit as good as Motorcraft OEM?

It matches Motorcraft in micron rating (4-micron @ 99%), form factor, fitment, and housing compatibility. The key difference: you pay $111.60 for all three in one box vs. $191.89 buying three separate Motorcraft boxes from the dealership. Same protection, 42% less money, one shipment.

Q4: Why is the FA1927 air filter cylindrical instead of flat like the 2011–2016 trucks?

Ford redesigned the air intake for the 2017+ Super Duty to accommodate the higher-output 450-hp tune. The cylindrical design with foam pre-filter provides more surface area and better dust capture at high airflow rates. The flat FA1902 panel filter from 2011–2016 trucks cannot be retrofitted.

Q5: Do I need a fuel additive if I’m changing filters regularly?

Yes. Ultra-low-sulfur diesel (ULSD) has reduced lubricity compared to pre-2007 diesel, and the CP4.2 relies entirely on fuel for internal lubrication. A quality fuel additive with lubricity improvers (like Opti-Lube or Hot Shot’s Secret) adds an insurance layer between filter changes. At $0.05 per treated gallon, it’s cheaper than even one injector replacement.

Q6: Why do some Amazon kits cost $50–$57 while TruckTok costs $111.60?

Two real examples from our July 2026 Amazon search:

• YZQPNB at $56.99 (4.6★, 91 ratings): Ships FL2124S oil filter — wrong part for 2017–2019. FL2124S fits 2020+ with different thread pitch and bypass pressure. Most buyers don’t discover this until they’re under the truck with the old filter already removed.
• RARAYC at $49.99 (4.7★, 144 ratings): Only includes fuel + air filters — the oil filter is missing entirely. Add a separate FL2051S and your real cost is ~$82, not $50.

Beyond fitment errors, budget kits typically cut corners on filter media (filtration drops below 4-micron under load), use nitrile O-rings instead of Viton (swelling and leaking after 2–3 fuel exposures), and skip the foam pre-filter on the air element. When the CP4.2 replacement bill starts at $8,000, the ~$55 difference isn’t a “savings” — it’s a wager.

Q7: Can I change just the oil filter without draining the oil?

Technically yes — the FL2051S sits above the oil level in the pan when the engine is off. But this is false economy. If your filter needs changing, your oil is at the end of its service life too. Change both together.

Q8: My truck has a CP4 disaster prevention kit installed — does that change filter requirements?

No. A disaster prevention kit (DPK) or bypass kit catches metal shavings downstream of the CP4.2 if it fails — it does not prevent the failure. You still need maximum filtration performance to keep the pump healthy in the first place. A DPK is insurance after the disaster; good filters are the prevention.

Q9: Will changing my own filters void my warranty?

No. The Magnuson-Moss Warranty Act protects your right to perform your own maintenance. Document your filter changes (date, mileage, part numbers, photos of the old filters) and keep receipts. Use filters that meet or exceed OEM specifications.

Q10: Can I reuse the foam pre-filter from my old FA1927 on a budget replacement?

No. The foam pre-filter is bonded to the FA1927 during manufacturing. Budget replacements that lack the foam layer are designed as bare-pleat filters and can’t accept a separate foam wrap without restricting airflow. Buy a complete FA1927 with the integrated foam pre-filter.

Q11: What’s the difference between FL2051S and FL2124S?

Both fit the 6.7L Powerstroke, but the FL2124S is a newer revision with a slightly higher bypass valve pressure setting. The FL2051S remains the standard recommendation for 2017–2019 trucks. Either is acceptable; the difference in practice is negligible for stock engines.

Q12: How do I dispose of used diesel filters and oil?

Drain used filters for 24 hours into your waste oil container. Take drained filters and waste oil to AutoZone, Advance Auto Parts, or O’Reilly — all three accept up to 5 gallons of used oil and filters per visit, free of charge. Never throw diesel filters in household trash. Diesel residue is a groundwater contaminant.

Bottom Line

The 2017–2019 6.7L Powerstroke is the sweet spot of the Super Duty lineup: aluminum body weight savings, the refined 450-hp tune, and the 6R140 TorqShift transmission — all before the complexity of the 2020 redesign. These trucks will run 300,000+ miles with basic maintenance.

But the CP4.2 doesn’t negotiate. It runs at 30,000 PSI on diesel fuel lubrication alone, and the only thing between that pump and a $12,000 repair bill is three filters, changed on time, with parts you trust.

At $111.60 for all three, you’re spending roughly $0.007 per mile on CP4.2 protection. Skip it, and you’re one tank of bad fuel from a flatbed bill that buys half a used Corolla.

Change your filters. Prime the system. Use a fuel additive. And never, ever put a $24 eBay FD4625 in a $70,000 truck.

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Shop the TruckTok 2017–2019 6.7L Powerstroke 3-Piece Filter Kit →

Questions or stuck on a step? Join the discussion on the TruckTok Forum:

• 2017-2025 6.7L Fuel Filter Discussion (FD4625) →
• 2011-2025 6.7L Oil Filter Discussion (FL2051S) →
• 2017-2019 6.7L Air Filter Discussion (FA1927) →

Disclaimer: This article is for informational purposes only. Filter specifications, pricing, and availability change over time. Always verify fitment against your VIN. The author and TruckTok assume no liability for damage resulting from improper installation or maintenance. When in doubt, consult a certified diesel technician.