I'm dying over here! So here's the scoop:
I've been having fuel pressure problems. My jeep would sometimes begin to stall when any throttle was put into it. Sometimes it wouldn't start at all. Sometimes it runs no problem. But recently it's been not firing after turning over so I rented a fuel pressure gauge. When it has pressure the pressure is good. Occasionally I'll watch the gauge and it'll slowly start to lose pressure. And sometimes it wont have any pressure at all. It was running really lean when it wouldn't pass smog so knowing it was having these problems I replaced some stuff:
Fuel Pressure regulator
Throttle Positioning sensor
Crankshaft positioning sensor
Idle Air control sensor
Manifold Air pressure sensor
Intake Air temperature sensor
The O2 sensor was changed about a year or so ago. I replaced the entire sending unit (Including the pump) two years ago and thinking it was the pump again I bought a bosch one and last week rereplaced just the pump to see if it changed anything. It didn't. I will say that it is idling at a nicer rpm, sometimes... When it won't start I've disconnected the hose from the back of the fuel filter and either nothing or a small drip will come out. I am running out of things to try. I thought I'd bring it to the experts!
The only thing that is weird to me is that when I pull the gas tank cap off there is a large release of pressure, after its been running. Is that normal? My truck doesn't do that. Also, I don't know if this is normal or not, but is the fuel pump sending unit supposed to be pinned in between the top and bottom of the gas tank? I was rear ended so my skid plate back there is a little warped but I seem to remember having to pull the tank up to the sending unit gasket before the accident as well. The other thing I can think of is when I dropped it recently I discovered that the longer fuel tank vent hose was pinched. But I replaced it and put it back up doing my best not to pinch it this time. I just can't think of what else to try. Could it be the ECU taking a dump? I have tried resetting it (Leaving the battery disconnected for 8 hours) and it started up after doing that, but it wasn't a long term fix. Why would it be so spotty?
Any troubleshooting you guys can help me with would be amazing! Thank you so much!
I've been having fuel pressure problems. My jeep would sometimes begin to stall when any throttle was put into it. Sometimes it wouldn't start at all. Sometimes it runs no problem. But recently it's been not firing after turning over so I rented a fuel pressure gauge. When it has pressure the pressure is good. Occasionally I'll watch the gauge and it'll slowly start to lose pressure. And sometimes it wont have any pressure at all. It was running really lean when it wouldn't pass smog so knowing it was having these problems I replaced some stuff:
Fuel Pressure regulator
Throttle Positioning sensor
Crankshaft positioning sensor
Idle Air control sensor
Manifold Air pressure sensor
Intake Air temperature sensor
The O2 sensor was changed about a year or so ago. I replaced the entire sending unit (Including the pump) two years ago and thinking it was the pump again I bought a bosch one and last week rereplaced just the pump to see if it changed anything. It didn't. I will say that it is idling at a nicer rpm, sometimes... When it won't start I've disconnected the hose from the back of the fuel filter and either nothing or a small drip will come out. I am running out of things to try. I thought I'd bring it to the experts!
The only thing that is weird to me is that when I pull the gas tank cap off there is a large release of pressure, after its been running. Is that normal? My truck doesn't do that. Also, I don't know if this is normal or not, but is the fuel pump sending unit supposed to be pinned in between the top and bottom of the gas tank? I was rear ended so my skid plate back there is a little warped but I seem to remember having to pull the tank up to the sending unit gasket before the accident as well. The other thing I can think of is when I dropped it recently I discovered that the longer fuel tank vent hose was pinched. But I replaced it and put it back up doing my best not to pinch it this time. I just can't think of what else to try. Could it be the ECU taking a dump? I have tried resetting it (Leaving the battery disconnected for 8 hours) and it started up after doing that, but it wasn't a long term fix. Why would it be so spotty?
Any troubleshooting you guys can help me with would be amazing! Thank you so much!