texas_rat_trap
Well-known member
Okay heres the problem.... when I first start the car up fuel pressure is about 8psi then after about 15 minutes of idle or a short drive, the fuel pressure slowly starts dropping to about 1.5-2psi then will go up to about 4psi then slowly fluctuates back & forth between 1-4psi till I shut it off for about an 1 hour (with little to no fuel in clear filter after pump) then I'll start it back up and it'll repeat above pretty closely. I am running an Airtex electric fuel pump rated at 5.5-9psi. I already changed the fuel pump out once so know I have a good working pump and already tried taking the gas cap off when it started acting up in case of a vent restriction. I have dropped the fuel tank to check for trash in the tank and it looked like the tank has been cleaned recently , there was only a little sediment in bottom of tank and I cleaned that out. I am using the original hard metal fuel line from tank to engine. I'm thinking there has to be a restriction in the line but you'd think I would have low fuel pressure all the time. Also do you think I should move the pump as close to the tank as possible, I have it mounted on fender well in the engine compartment...where all my friends have mounted theirs and they have no issues. Please help I do not want to drop the tank again. P.S. unless there is a big piece of trash I missed that when I 1st start it up the pump slowly pulls it against the pick up tube in the tank blocking it off and when I turn the engine off it settles back down.... and if you ever seen the in side of one of the tanks the pick up tube opening is very small so it doesn't take much. :arg: