Thread: Engine Swap - '92 5.0EFI/AOD into '66 Ford F100....

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Originally Posted by randyr

.....I reassembled everything......and nothing has changed.

I loosened the hold down bolt and rotate the distrib with the key on. As it rotates the fuel pump primes and the pressure gauge jumps to 45psi, then back to zero.

That's a very neat cleaning/testing rig you came up with! I had a thought about the fuel rail - with it off and the FPR removed have you blown air through it to ensure it's not plugged?

The timing advance step proves that the pump primes and comes up to pressure, but that going back to zero makes me wonder if your fuel pressure regulator may be bad, or that you might have an injector stuck open but you proved they cycle? On my '33 the pump comes on, primes the system, and then the system holds pressure for quite a long time with the engine not running. Sounds to me like your's is letting the pressure bleed back to the tank. Sure would be nice to be able to swap one from a known good engine for a test, but you can get one for less than $20, or less than $50 for MotorCraft. Hate to throw parts at something, but this one seems to be pointing to a problem?