Dragster48

Ok, first off the car has been rewired to bypass the VAT system. Tank is getting proper voltage, pump is priming, new pump, new filter, cleaned lines.

Alright.. Now, when I turn the car to the on position the fuel pump primes and according to my PSI gauge attached to the weep hole on the injector line it goes from 0-21 PSI. Then leaks back down to 3 PSI within 3 seconds.. Can't get proper pressure. I noticed that when you prime the tank a sound like your letting air out of a tire when traced back it is coming from the tank. I checked the seal around the top of the tank and it is sealed properly.

So my question is: Is there anything that could be causing the tank to release the pressure on the tank after it hits a certain PSI or is there anything I should be looking for? And how much gas should be in the tank to properly test the PSI again?

aliceempire

iTrader: (14)

Less than 5 gallons is enough fuel to make sure the pick up gets enough fuel. Sounds like you have a either a bad pump, bad check valve in the pump, or the line/pulsator between the pump and the sending unit is bad. Anothe possiblity since you have a strange noise while priming is line may be hooked up incorrectly.

John 89 Formula

Sounds like a bad fuel pump or regulator. 21psi is not enough you should be getting around 41 or so.