I hope this diagram is correct? At the relay, the relay has two sides, the load side carries voltage to the pump, that is the line that looks like it switches between D and E. The control side of relay is on the right, that side needs voltage and ground. The voltage comes from ecm, usually a green wire with white tracer. Did you check for voltage on that wire, engine cranking? Even though the fuel pump gets voltage through the oil pressure switch, does the vehicle start and run? If more than one problem, I'd have to check rpm signal and where applicable, security system.
I was just curious, engine cranking, you have spark at the plugs and fuel injector pulse?
SOURCE: 2000 chevy 1500 6 cyl pickup wont start just spins
Maybe a problem with the theft deterrant system. My Tahoe had a similar intermittant problem and the dealer said there was a fault in the theft system and it would shut off the fuel pump.
SOURCE: 1996 2-door Chevy Tahoe won't start.
On the driverside of the engine towards the back of the intake your fuel lines run there. you will see a black cap that covers the fuel pressure test port. you will need to get a pressure tester if you do not have one. it will screw onto the fitting there. your pressure should be 40 to 60 psi. as for the fuel pump it is located in the fuel tank. it is the fuel module. it contains the fuel pump and sending unit. I hope this helps.
Reno
SOURCE: injector pulse stops after warm up
Most temperature sensor decrease in resistance as temperature goes up. As resistance decrease, current increases while the voltage remain constant, which is usually 5 volts. What you can do is unplug the temperature sensor, that should keep the car from dying for diagnostic purpose only.Look for a plug that is similar to the temperature sensor. Sometimes, a wire terminals is not plugged in where they should be. You know the the temperature sensor is working because the computer responded by turning the engine off. Only that it is connected to the wrong input of the computer thats why it does that. To sum it up look for similar looking wires terminals they maybe crossed. Look for sign where a wiring had been repaired. they may have been connected to the wrong place. Hope this helps.
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