Jeep wont start. Started up a couple times sputtering and died after a few seconds. Ran fine this morning. Had the fuel pump out last weekend to replace the seal. It ran fine before and after that till now.

 

I always suspect the last changes first. Check the fuel pressure at the rail, and inspect any wiring you touched when you did the pump seal.

 

10-4 i just bought this a week ago so i was thinking maybe the float got bent a bit changing how the fuel gage read. I put fuel in it and it started. Bit just today it sputtered and died again. Better check pressure and such.

 

Fuel pressure at the rail is 42 psi. Is that low?

 

I replaced the fuel filter and pressure regulator on the rail and still won't start when its cooler out. 40 degrees no start 70 degrees starts and runs fine. Help!

 

Ok it wont start again so I checked the fuel pressure and I got nothing.
Fuel pump wont kick on anymore.
I tested the continuity in the five wires leading to the fuel pump and three of the 5 showed the signal.
I checked the fuel pump relay and it is also fine.

Is there anything else that can be the culprit before I go tracing the wires in the harness?

I am trying to avoid this. Please someone give me some info!

Thanks

 

what brand pump did you go with? zj's are picky (especially the v8s) about any sensor or electric crapola

also, could be crank position sensor, check all plug wires and coil (common zj bad guys)

 

It is the original fuel pump. I haven't replaced it because it was working. Maybe it has a dead spot or something.

I have spark when it cranks just no fuel in the rail. May try banging on the pump to see if there is a dead spot. Probaly check the cps too.

 

Looks like the fuel pump is bad. Pounded on the tank and it started.

Thanks for the tips