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No it's not normal. Check your fuel pressure, check for a leaking injector, ensure fuel pump energizes to full pressure with initial key on cycle.
1) First, i assume you mean sitting for hours, not the other thing that was typed....... i'm going to go with leaking injectors.
do you hear the fuel pump come one when you first turn the key on?
Quote from: Irish_Alley on May 28, 2019, 07:52:59 PMdo you hear the fuel pump come one when you first turn the key on?It not real loud but I can hear what seams like a fuel pump it has duel tanks it’s the same on both fuel filter was changed also when we rebuilt the tbi. Each tank would have it own fuel pump correct. Sent from my iPhone using Tapatalk
no, theres no check valve. if you take the fuel cap off you should be able to hear the fuel pump for a few seconds when the key is first turned on.
First of all it just a guessing game if you don't have a fuel pressure gauge on this. If you can get a hold of a gauge you can isolate the fuel pressure drop of either the supply side or the return side. If you cant get a hold of a gauge and see no external leaks or drips from the injectors it could be the pump check valve. But if does it on either tank its not likely. I know you said the TBI unit was rebuilt but my best guess would be the fuel pressure diaphragm seat. They are a highly polished seat that mates to the casting in the throttle body to close off the fuel return to the tank. If it is not seating good from say a burr it could be bleeding off.