95 XJ, 4.0L, AX15

At the end of the summer I installed a fuel cell I made from a old hydraulic tank. I washed it out with water and then left it in the sun to try. I attached the factory fuel pump assembly. It has a vented cap and internal baffles.

The problem started a little after the install.

I can drive around for a minute or two, but when I get into the throttle it will choke and sputter and I can hear the fuel pump cycling up and down and see the fuel hose pulsing. The jeep can barely move if it doesn't just die on the spot. If I turn off the key and let it sit for a minute then start it again, it all repeats.

The fuel filter is brand new, I've switched the fuel pump and the fuel pressure regulator with spares to no avail. I inspected the fuel lines for pinches and I also wired the fuel pump straight from the battery to see if the power source was goofy.

The next thing I was going to do is switch the computer with a spare I have for the same year and drivetrain. Also I might try eliminating the fuel filter to see if I just got a bad one.

Thanks for any thoughts.

 

sounds like the pickup is either too close to the bottom of the tank or the tank is in fact not venting