Description
Ford 7.3L Powerstroke Fuel Filter Cap F81Z-9G270-BA — OEM Replacement
The F81Z-9G270-BA Fuel Filter Cap is the OEM-spec replacement for 1999-2003 Ford 7.3L Powerstroke engines. This cap threads onto the fuel filter housing on top of the engine and secures the FD-4596 filter element. Over time, the OEM cap's plastic threads can strip or the O-ring groove can deform, causing fuel leaks and air intrusion.
Specifications
| Part Number |
F81Z-9G270-BA |
| OEM Cross-Reference |
1831193C91, RK31449, 904-203 |
| Material |
High-temperature resistant composite |
| Fitment |
1999-2003 F-250, F-350, F-450, F-550 7.3L Powerstroke; 2000-2003 Excursion 7.3L; 1999-2003 E-350, E-450, E-550 7.3L |
| Thread Size |
Standard 7.3L Powerstroke fuel bowl thread pattern |
Signs Your Fuel Filter Cap Needs Replacement
-
Diesel fuel smell in the engine bay — the cap O-ring is leaking
-
Hard starting after sitting — air enters through a leaking cap seal
-
Visible fuel residue around the top of the fuel bowl
-
Cap won't tighten properly — stripped threads in the cap or bowl
-
Fuel leaking onto the valley — pools on top of the engine under the intake
FAQ
Q: Do I need the cap or just the filter?
A: The late 7.3L (post-12/7/98) uses an integrated cap-and-filter assembly (FD-4596). If you're buying the FD-4596, the cap is included. This separate cap is for when the cap threads/O-ring fail but the filter element is still good — or if you're using a standalone filter element and need a replacement cap.
Q: Can I over-tighten the fuel filter cap?
A: Yes! The cap only needs to be hand-tight plus 1/4 turn. Over-tightening with a wrench can crack the cap or strip the fuel bowl threads. If the cap O-ring is properly seated, hand-tight is completely sufficient to seal.
