I have a 99 Jimmy driving along, just quit. Fuel pump running, good spark. Looking for information on testing and replacing the injector assembly. I just want to make sure I'm not replacing the assembly, if it's not needed.
Thanks,

 

Okay, but do you know what the pressure actually is? Follow all the steps in 96+ Fuel System Diagnosis.

 

The fuel pump is running, and was just replaced not too long ago. I did not check the pressure, figuring it should be ok since the pump is pretty new.

 

Don't assume that the pump is good just because it was recently replaced. Aftermarket pumps are junk.

 

Thank you. You were correct, I checked the pressure at the test port, 40psi, almost went to 50psi, thats it. I am going to replace the fuel filter first, but I think your right on the pump.

 

Does the pressure hold steady once the pump shuts off?