Bad Fuel Pump??????

[Mciamp99]

I am back and the LT-4 in the 75 was running fine, then it started to quit. It would run until hot, then the fuel pump would shut down. After a few minutes it will restart but quit soon after. I found no codes, I still have a noid light when I try to restart. I changed the relay and still have the same problem. I only have 38 psi at the fuel rail head and then it drops to zero when the engine dies. I did jump power to the fuel pump and the same thing happened. My fuel pump is in the gas tank. I am using a 96 Fuel Pump in the 75 tank.

It seems to me that I have a bad fuel pump, does anyone agree or have an alternate suggestion.

This forum has been great, thanks for all your help.

 

[Eagle85C4]

I would say you have found your problem....Good Luck

 

[sumoboy]

I agree, it sounds like your fuel pump. But also check injector leakdown. On the 75 tank that you said you still use, the vapor system is a vented system and for the EFI systems they are non-vented due to a pressureized system. I don't know if you changed the system also but figured I'd ask.

 

[Mciamp99]

I am using the 75 vapor system, would you suggest I just plug it?. I had done about 60 miles before this problem arose and the motor has many hours on it with this set up, but I am open to all suggestions to rectify the problem for the future.