Description
Short answer: The iFJF FD-4625 fuel filter kit is a two-element diesel fuel filter set for the 2017–2025 Ford 6.7L Powerstroke V8 in the F-250 through F-750 Super Duty. It replaces Motorcraft FD-4625 and FD-4624 and the Ford OE numbers HC3Z-9N184-B and HC3Z-9N184-C, separates 98% of water from diesel, and is rated for a 15,000-mile service interval.
FD-4625 Fuel Filter Kit for 2017–2025 Ford 6.7L Powerstroke — Engine & Frame Mounted Set
The FD-4625 is the two-element fuel filter service set for the 2017-and-newer Ford 6.7L Powerstroke diesel. The 6.7L Powerstroke runs a two-stage fuel system, and this kit covers both stages: the frame-rail-mounted primary filter and water separator, and the engine-mounted secondary filter that protects the high-pressure CP4.2 injection pump. Both elements are direct replacements for Motorcraft FD-4625 and FD-4624 and for the Ford OE numbers HC3Z-9N184-B and HC3Z-9N184-C.
Diesel fuel carries water and abrasive particulate straight from the pump to the injectors. On a common-rail engine the CP4.2 pump and its injectors are lubricated by the fuel itself, so contamination is not a filter problem — it is a five-figure repair waiting to happen. This kit separates 98% of free water and traps fine particulate before it reaches the pump, keeping the fuel system clean and the injectors on spec.
📋 Key Takeaways
- ✅ Complete Two-Filter Service: Includes both the frame-rail primary filter/water separator and the engine-mounted secondary element, plus the housing gasket and a spare fuel return line retainer clip — the full 6.7L Powerstroke fuel service in one box.
- ✅ Exact OEM Fit: Directly replaces Motorcraft FD-4625, FD-4624 and Ford OE HC3Z-9N184-B / HC3Z-9N184-C, plus the superseded FD-4625-AA, HC3Z-9N184-J, LC3Z-9N184-A and FD-4641 numbers.
- ✅ 98% Water Separation: Pulls free water out of the fuel stream before it reaches the CP4.2 high-pressure pump and the injectors.
- ✅ 15,000-Mile Service Interval: Rated for 15,000 miles or 12 months under normal duty, with a shorter severe-duty cycle for heavy towing and high-idle work.
- ✅ Broad Super Duty Coverage: Fits 2017–2025 F-250, F-350, F-450, F-550, F-600, F-650 and F-750 Super Duty trucks with the 6.7L Powerstroke V8 diesel.
Features & Benefits
| Feature |
Benefit (What It Means for You) |
| Two-Element Kit (Engine + Frame Mounted) |
Covers both stages of the 6.7L Powerstroke fuel system in a single purchase, so the water separator and the fine filter are replaced together — the way Ford specifies the service. |
| 98% Water Separation |
Free water is the number one cause of CP4.2 pump and injector failure. Separating it upstream keeps water out of the high-pressure rail and off your repair bill. |
| High-Efficiency Media |
Traps fine dirt, rust and abrasive particulate so the pump and injectors see clean fuel, supporting stable rail pressure, clean starts and full towing power. |
| Exact OEM Dimensions and Sealing |
Correctly moulded end caps, gasket seat and O-ring grooves hold a leak-free seal in the factory housings — no trimming, no adapters, no air-in-fuel hard starts. |
| 15,000-Mile Service Rating |
Matches the scheduled maintenance most 6.7L owners already follow, so you plan one service instead of guessing at intervals. |
| Fresh Gasket Included |
Housing seals are one-time-use. A new gasket in the box means you are not reusing a heat-compressed seal that will weep after the first heat cycle. |
Compatibility & Cross-Reference
This kit fits the 2017–2025 Ford 6.7L Powerstroke V8 diesel (F-250, F-350, F-450, F-550, F-600, F-650 and F-750 Super Duty) and replaces the following numbers:
Replaces OEM Part Numbers:
| Interchange Part Number |
Brand |
| FD-4625 |
iFJF / Motorcraft |
| FD-4624 |
Motorcraft |
| FD-4625-AA |
Motorcraft |
| HC3Z-9N184-B |
Ford OE |
| HC3Z-9N184-C |
Ford OE |
| HC3Z-9N184-J |
Ford OE |
| LC3Z-9N184-A |
Ford OE |
| FD-4641 |
Motorcraft |
Common Applications:
- 2017–2025 Ford F-250 Super Duty 6.7L Powerstroke V8 diesel
- 2017–2025 Ford F-350 Super Duty 6.7L Powerstroke V8 diesel
- 2017–2025 Ford F-450 Super Duty 6.7L Powerstroke V8 diesel
- 2017–2025 Ford F-550 Super Duty 6.7L Powerstroke V8 diesel
- 2017–2025 Ford F-600 / F-650 / F-750 Super Duty 6.7L Powerstroke V8 diesel
Fitment note: Ford changed the under-hood housing on some 2023-and-newer trucks. Confirm your model year and original part number against the table above — if you are unsure, contact us with your VIN and we will confirm the correct kit before you order.
Specifications
| Part Number |
FD-4625 |
| Replaces |
FD-4624 / FD-4625-AA / HC3Z-9N184-B / HC3Z-9N184-C / HC3Z-9N184-J / LC3Z-9N184-A / FD-4641 |
| Filter Type |
Two-element fuel filter set (frame-mounted primary water separator + engine-mounted secondary) |
| Filtration Rating |
10 Micron |
| Water Separation |
98% |
| Service Interval |
15,000 miles / 12 months (normal duty) |
| Engine |
6.7L Powerstroke V8 Diesel |
| Includes |
1 × engine-mounted filter element, 1 × frame-mounted filter/water-separator element, 1 × housing gasket, 1 × spare fuel return line retainer clip |
Why Choose iFJF Over the OEM Dealership?
🛡️ 90-Day Warranty Included · 30-Day Easy Returns · Lifetime Support
Not satisfied? Return it. Fails prematurely? We’ll replace it — no receipt-hoarding, no dealership runaround.
Every iFJF fuel filter is built to match — and in water separation, to exceed — the OEM specification it replaces. Each production batch is verified before it ships:
- 🔬 Media and Efficiency Verified: Filter media is validated for filtration efficiency, particle-holding capacity and collapse/burst strength.
- 🔍 100% Leakage Control: Housings and gasket seats are pressure-checked so the elements seal in the factory canister without weeping or drawing air.
- 🛡️ Built for Diesel Duty: Multi-layer media and heavy-duty end caps hold up to heat cycling, vibration and water-laden fuel.
- 💰 Factory-Direct Supply: Commercial-grade filtration direct from the manufacturer, without dealer counter markup.
⭐ Trusted by 100,000+ vehicle owners · Parts in stock and ready to ship from our US warehouse.
Looking for related fuel-system parts for your Super Duty? Check out our FD-4625 Fuel Return Connector here →
Comparing filter options for the 6.7L Powerstroke? Read about our 5-Micron FD-4615 Fuel Water Separator →
🛒 Frequently Bought Together:
📂 Browse More: All Fuel Filters →
Ford 6.7L Powerstroke Compatible Parts →
Frequently Asked Questions
Q: What years and trucks does the FD-4625 fuel filter kit fit?
A: The FD-4625 fits the 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024 and 2025 Ford 6.7L Powerstroke V8 diesel in the F-250, F-350, F-450, F-550, F-600, F-650 and F-750 Super Duty. Ford's own parts catalog lists the HC3Z-9N184-B/C element family for the 2017-2019 and 2023-2025 Super Duty and the same family supersedes FD-4641 and LC3Z-9N184-A for the 2020-2022 trucks. Always confirm your model year and original part number against the cross-reference table above before ordering.
Q: What part numbers does this kit replace?
A: This two-element kit replaces Motorcraft FD-4625 and FD-4624 and the Ford OE numbers HC3Z-9N184-B and HC3Z-9N184-C. It also covers the superseded numbers FD-4625-AA, HC3Z-9N184-J, LC3Z-9N184-A and FD-4641. If your current filter is stamped with any of these numbers, this kit is the direct-fit replacement.
Q: How often should the FD-4625 fuel filter be replaced?
A: Replace both elements every 15,000 miles or 12 months, whichever comes first. Ford's severe-duty schedule for heavy towing, high-idle use and dusty or off-road conditions comes sooner — as early as 10,000 to 12,000 miles. A 6.7L Powerstroke uses a two-filter system, so replacing only one element leaves the high-pressure CP4.2 pump partly unprotected.
Q: What is included in the box?
A: The kit contains one engine-mounted (under-hood) secondary filter element, one frame-rail-mounted primary filter/water-separator element, the sealing gasket for the filter housing, and one spare fuel return line retainer clip. The original clip is fragile and can break when you release the fuel return line, so a spare clip is supplied with every kit. The Ford HC3Z-9A317-A number is the equivalent genuine clip if you ever need another.
Q: Does this kit come with all the seals needed for a leak-free install?
A: Yes. Every kit ships with the housing gasket required for a complete, leak-free service. Lubricate the gasket with clean diesel before you seat it, and never reuse an old, heat-compressed gasket — a gasket that looks serviceable will usually not seal on re-installation.
Q: What are the step-by-step installation instructions?
- Park on level ground and let the engine cool; place a drain pan under the frame-rail filter.
- Open the frame-rail drain valve and drain any water and fuel into the pan, then close the valve.
- Remove the frame-rail housing cap and pull the primary (water-separator) element straight out.
- Wipe the housing, fit the new gasket and the new primary element, then refit and tighten the cap.
- Release the fuel return line clip at the under-hood housing, lift the cap and pull out the secondary element; fit the new element and gasket and lock the cap back into place.
- Cycle the ignition to RUN — do not crank — for about 20 seconds, eight to ten times, so the lift pump purges air from both housings.
- Start the engine and inspect both filter housings for weeping or fuel smell before you drive.
Package Includes
- 1 × Engine-mounted secondary fuel filter element
- 1 × Frame-mounted primary fuel filter / water separator element
- 1 × Filter housing gasket
- 1 × Spare fuel return line retainer clip
Common Problems with OEM & Aftermarket 6.7L Powerstroke Filters — Solved by iFJF
Owners of 6.7L Powerstroke trucks keep reporting the same handful of fuel-filter problems. Here is what goes wrong — and how this kit addresses it:
| ❌ What Owners Complain About |
|
✅ How iFJF Solved It |
“Water in fuel light, then a CP4.2 failure”
— Common complaint in 6.7L Powerstroke owner forums
|
→ |
98% water separation at the frame-rail primary
Free water is pulled out of the fuel stream before it reaches the high-pressure pump, and the kit replaces the primary element rather than leaving an old separator in place.
|
“It leaked at the housing after the first heat cycle”
— Common complaint in aftermarket filter reviews
|
→ |
New housing gasket in every box
Housing seals are one-time-use and compress permanently under heat cycling. Supplying a fresh gasket removes the single most common cause of a weeping housing after service.
|
“Only one filter turned up, so half the job was wasted”
— Common complaint in single-element listings
|
→ |
Both stages — plus the fragile clip — ship in one kit
The 6.7L uses a two-element system. This kit includes the frame-mounted primary, the engine-mounted secondary, a fresh housing gasket and a spare retainer clip, so the service is complete in one order.
|
“Hard start and rough idle after the filter change”
— Common complaint after DIY filter service
|
→ |
Correctly moulded caps and O-ring grooves
Air enters only where a seal is imperfect. OEM-dimension end caps and grooves seat properly in the factory housings, and the included priming sequence (ignition to RUN, no cranking) purges air before the first start.
|
🔍 We read the 1-star and 2-star reviews so you don’t have to. Every iFJF product is engineered to solve the real problems owners actually face — not just match a spec sheet.
Factory Direct Supply & Wholesale — iFJF is a direct manufacturer of high-performance automotive and outdoor filtration systems. Custom specifications and bulk orders are highly welcome. Contact us for exclusive dealer pricing and volume discounts. Backed by ISO 9001:2015 and IATF 16949:2016 quality management system certifications.
Email: support@ifjf.com
