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

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Just a thought, is your gas cap vented? If so wouldn't that not allow the system to pressurize?

Originally Posted by rspears

I wouldn't think back pressure would hurt the FPR. We're overlooking something basic, but I have no idea what at this point. You've verified good spark during crank, not just ignition power when "ON", right?

Yes, it's supposed to be a fat blue spark at the distributor according to what I've read. I'm not sure how "fat" is fat but I do have blue spark at distributor when cranking.

Originally Posted by NTFDAY

Just a thought, is your gas cap vented? If so wouldn't that not allow the system to pressurize?

The tank is vented thru a charcoal canister. The cap is a "push thru" type but it seals when closed.

I just got off the phone with Justin at Tanks, Inc. regarding the fuel pressure issue. He suggested (easiest to hardest) swapping the FPR, making sure constant voltage to the pump, then if all else fails, drop the tank to make sure the pump installation was correct. If the clamps on the fuel pump line in the tank aren't tight enough, it could be losing pressure there.

So, I'm planning a way to put my pressure gauge where the fuel line disconnects at the frame rail. That will keep the FPR out of that reading. If that pressure is constant, I think the pump installation should be good. Will let you know if that works....