1986 Ford F-150 fuel pressure

THEREDNECK

MEMBER
1986 FORD F-150
V8
4WD
MANUAL
10,025 MILES

I dont understand why engine after hot will not restart unless I releive fuel pressure. Pressure on rail is with in specks running or key off. But the 3rd injector leaks fuel past oring causing it to push fuel out of top of seal area. What is the deal here

Monday, March 17th, 2008 AT 6:42 PM

2 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Its on specs-did you do this test with and w/o the pressure regulator.

Recheck the pressure and fix the leaking injector O-ring and give us the readings-

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Monday, March 17th, 2008 AT 8:04 PM

THEREDNECK

MEMBER
1 POST

With the pressure regulater- engine running, it is 32psi. Engine off key on after turning key on and off about 5 times, pressure is 40 psi with regulater. With out engine running it is 33psi. And I cant get the injector to seal. All others is fine, just that one. I replaced the o rings 2wice. After the engine gets warm it goes to a high idial as well. Is this something to do with the fuel leak leaning it out to much? Dont leak till it warms up to normal oprerateing temp? Could there be something up wiht the ecm or modulater

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Monday, March 17th, 2008 AT 9:24 PM