Tenny
NAXJA Forum User
- Location
- Houston, TX
Alright, so this has been an on-going problem for years now. Finally "really" trying to solve this.
Basically the Jeep would eventually start if I kept trying to crank it over, but sometimes it'd take a few minutes. If I used starting fluid, it would generally always start pretty easily and run just fine. Once it started, I could start it back up within the next few hours pretty easily. I thought at first it was the fuel draining back into the fuel tank, thus the FPR / Filter / Additional check valve was installed. That didn't fix it, so I installed a new fuel pump figuring the old one was just going bad at this point.
Well that didn't work obviously. So I bought a fuel injection pressure tester. What I've determined from that is sometimes it primes the fuel system, sometimes it doesn't. I would say it's every few key turns the fuel pump primes (and primes to about 51psi). If it doesn't prime it flashes the check engine light (I think five times). Even if it doesn't prime, but it ran recently it'll have enough fuel pressure to start and turn on just fine.
It was holding at 40psi after being off for about 2 hours earlier. The problem is I don't really drive this vehicle often. Right now it's probably only started 3-4 times this year, last year I used it for towing for a few months and it did pretty well during that time. Before that it probably moved 10-12 times a year.
So far I've replaced:
Additional "swaps" I've done that didn't fix it:
Swapped the fuel pump relay and the A/C Relay (A/C hasn't worked for years so I don't know if this is a valid test).
ECM/ECU or whatever is near the driver fender (Had a spare)
Basically the Jeep would eventually start if I kept trying to crank it over, but sometimes it'd take a few minutes. If I used starting fluid, it would generally always start pretty easily and run just fine. Once it started, I could start it back up within the next few hours pretty easily. I thought at first it was the fuel draining back into the fuel tank, thus the FPR / Filter / Additional check valve was installed. That didn't fix it, so I installed a new fuel pump figuring the old one was just going bad at this point.
Well that didn't work obviously. So I bought a fuel injection pressure tester. What I've determined from that is sometimes it primes the fuel system, sometimes it doesn't. I would say it's every few key turns the fuel pump primes (and primes to about 51psi). If it doesn't prime it flashes the check engine light (I think five times). Even if it doesn't prime, but it ran recently it'll have enough fuel pressure to start and turn on just fine.
It was holding at 40psi after being off for about 2 hours earlier. The problem is I don't really drive this vehicle often. Right now it's probably only started 3-4 times this year, last year I used it for towing for a few months and it did pretty well during that time. Before that it probably moved 10-12 times a year.
So far I've replaced:
- Fuel Pressure Regulator
- Fuel Pump
- Fuel Filter
- Added additional Check valve in fuel line
Additional "swaps" I've done that didn't fix it:
Swapped the fuel pump relay and the A/C Relay (A/C hasn't worked for years so I don't know if this is a valid test).
ECM/ECU or whatever is near the driver fender (Had a spare)