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

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Originally Posted by rspears

I agree with Justin. The difference between the two pumps is volume capacity, not a pressure difference. It should start and run OK with the lower volume pump, but might stumble at WOT on a sustained high rpm run. Can you hear the pump running for sure? If so, it sounds like you've got something blocking flow. Maybe an old in-line filter? Have you put a pressure gauge on the fuel rail? That's one of the first things I'd add, just to know what pressure you're getting and eliminate the unknown. You can pick up a little 0-60psi liquid filled gauge for about $20.

Roger, the fuel filter is new, pressure regulator is new, fuel lines are stock Mustang. I tried using a tire pressure gauge on the release valve on the fuel line (looks like a valve stem) but it didn't register on that. I'll double check the lines, etc tomorrow and see if there's a restriction somewhere....

Originally Posted by randyr

Roger, the fuel filter is new, pressure regulator is new, fuel lines are stock Mustang. I tried using a tire pressure gauge on the release valve on the fuel line (looks like a valve stem) but it didn't register on that. I'll double check the lines, etc tomorrow and see if there's a restriction somewhere....

Do you know for sure that the pump is running for five seconds when you turn the key "ON"? We chased a no-start condition on a buddy's Deuce coupe all afternoon in a hotel parking lot, only to finally find that he had hidden a pair of OEM master fuses behind the dash panel 25 years ago. The fuel pump fuse was blown, and every time we pressed the schrader valve on the fuel rail we were just bleeding a tiny spray of residual pressure from the last time it ran. We (three of us) all swore that we had heard the pump running, but we were all wrong....