Description
Product Overview
The F81Z-9G270-BA Fuel Filter Cap is a precision-engineered replacement for the 1999-2003 Ford 7.3L Powerstroke diesel fuel filter housing lid. The OEM plastic cap is known to crack, strip, and leak over time — this aftermarket replacement provides a durable, leak-free seal for your Super Duty's fuel system. Compatible with F-250, F-350, F-450, F-550 Super Duty and Excursion models.
Key Features
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Direct OEM Replacement — Replaces Ford part numbers F81Z-9G270-BA, 1831193C91, and RK31449. Exact fit for 1999-2003 7.3L Powerstroke diesel engines.
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Durable Construction — Made from high-strength materials that resist cracking and deformation under the heat and pressure of diesel fuel systems.
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Leak-Free Seal — Precision-machined threads and O-ring groove ensure a tight seal, preventing air intrusion and fuel leaks that cause hard starts.
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Tool-Free Installation — 1/2" square drive or large flathead screwdriver for removal — no special tools required.
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Complete Kit — Includes cap and O-ring for a complete repair. Restore proper fuel system pressure in minutes.
Compatibility
| Year |
Make |
Model |
Engine |
| 1999-2003 |
Ford |
F-250 Super Duty |
7.3L Powerstroke V8 Diesel |
| 1999-2003 |
Ford |
F-350 Super Duty |
7.3L Powerstroke V8 Diesel |
| 1999-2003 |
Ford |
F-450 Super Duty |
7.3L Powerstroke V8 Diesel |
| 1999-2003 |
Ford |
F-550 Super Duty |
7.3L Powerstroke V8 Diesel |
| 2000-2003 |
Ford |
Excursion |
7.3L Powerstroke V8 Diesel |
| 1999-2003 |
Ford |
E-350 / E-450 / E-550 |
7.3L Powerstroke V8 Diesel |
Cross-Reference Part Numbers
| Brand |
Part Number |
| Ford / Motorcraft |
F81Z-9G270-BA |
| International |
1831193C91 |
| Dorman |
904-203 |
| NAPA / WIX |
RK31449 |
Why Replace Your Fuel Filter Cap?
The 7.3L Powerstroke fuel filter housing lid is a known weak point. The OEM plastic cap threads can strip, the O-ring groove can warp, and the cap itself can crack — all of which cause air intrusion into the fuel system. Symptoms include: hard starting (especially after sitting), rough idle, power loss under load, and fuel leaks at the filter housing. A new cap and O-ring is the first and cheapest fix before diving into injector or HPOP repairs.
Installation Tips
- Remove the old cap using a 1/2" square drive ratchet (no socket needed)
- Clean the filter housing threads and sealing surface
- Install the new O-ring — apply a thin film of clean diesel fuel for lubrication
- Thread the new cap by hand first, then tighten to 18-22 ft-lbs (snug + 1/4 turn)
- Cycle the key 3-4 times to prime the fuel system before starting
FAQ
Q: Will this cap fit my 2002 F-350 7.3L?
A: Yes. This cap fits all 1999-2003 Ford F-250/F-350/F-450/F-550 Super Duty trucks and 2000-2003 Excursions with the 7.3L Powerstroke diesel engine.
Q: Does this include the O-ring?
A: Yes, the kit includes both the fuel filter cap and the sealing O-ring for a complete repair.
Q: What are the symptoms of a bad fuel filter cap?
A: Common symptoms include hard starting (especially cold or after sitting), rough idle, loss of power under acceleration, visible fuel leaks around the filter housing, and air in the fuel system.
Q: Can I reuse my old O-ring?
A: We strongly recommend using the new O-ring included. Old O-rings flatten and harden over time, which leads to air leaks — the most common cause of 7.3L hard-start issues.
Q: What torque should I use?
A: Tighten to 18-22 ft-lbs. Hand-tighten first, then approximately 1/4 turn with a ratchet. Do not overtighten — this can crack the new cap or strip the housing threads.
