Deenasty

First off, I would like to say that I have read a few of the "low fuel pressure" threads using the search feature.

I am running an ls1 in a 1964 Chevelle SS, using the Ricks Hot Rod Shop Tank setup. My first issue was I didnt have enough voltage and amps at the pump. I am now way above what the pump requires with 14.7 volts at the pump, yet only getting 50psi fuel pressure at the fuel rail shrader valve. I am using the corvette style regulator/filter combo. I was told by Ricks hot rod shop, that the pump in this tank is an AC DELCO EP381 (25163473), which is the fuel pump in all ls1 equppied f-dodies. Yet, I am still having low fuel pressure, and the pressure fluctuates with any amount of throttle given.

I have -6an braided fuel line all the way from the tank to the fuel rail. No visible fuel leaks.

With the fuel pressure tester on the shrader valve, and the key on, but car not running, I get about 50-52psi. As minutes go bye, the pressure drops very slowly. I checked for a leaky injector, and none are present.

Any help would be great guys, Im starting to go crazy...

Jachin99

could it maybe be leaking so slow that it loses preasure but not fuel for whatever reason. have you double checked all of the potential leak points. try maybe replacing all the o rings and resnugging the lines. If you arent getting adequate preasure try checking the preasure at all connection points and see if you can isolate a leak or restriction. and maybe doulbe check the pump yourself to make sure someone didnt grab the wrong pump off the shelf and put it in ur car