gmcjimmy88
Active Member
- Joined
- May 15, 2005
- Location
- Fayetteville
Ok The fuel pump quit working on the tow burb last night. I replaced the the relay first cause it was cheap and easy. I tested for power at the plug at the tank (used a test light). I had power on the prime and normal operations side of the plug. Ground was also good. I replaced the fuel pump next. Before putting the tank back up I ran the pump real quick to make sure it worked on the prime and run sides. It worked as advertised. I put the tank up and hooked everything back up. I tried to start the truck but it acted like it was not getting fuel. I hit it with some starting fluid thinking the pump needs to prime itself. The truck started and died a few times with the staring fluid. After 3 or 4 times it stayed running. I took it for a drive around a few blocks. It ran great! Got back shut it off and tried to restart it. Nothing, the engine just cranked but no fire. It will start with starting fluid and stay running 4 out 0f 5 times. After running you can restart it sometimes without the fluid but you have to crank the motor for 30-60 seconds. I tested the pressure through the relief valve (like a tire valve stem) and the pump would slowly start to build up to 10 psi, but drops quickly. Once the truck is running the pressure stays close to 50 psi. the pump should not allow fuel to flow back through it to keep the line pressureized. It acts as though the regulator is allowing fuel to flow back into the tank and not to the injectors as it should. Question is though why did this problem just start? Could I have missed somethig in the tank which would allow the fuel to flow back into the tank? The regulator looks to be a pain in the ass to get to and is expensive. Anyone know of any way to "cap" the return line and see what happens? I think that if the return was "capped" it should quickly build pressure and hold it? I need some thoughts since this is the wifes daily driver and Ironically the fuel pump needs replaced on the back-up burb LOL. Thanks in advance for inputs and thoughts.
