Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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To confirm the pump is the cause (which it most likely is as this is most common) you would need to test for power and ground at the fuel pump connector itself at the fuel tank.The gray should have at or near 12 volts with the key on the first 2 seconds and the black should have a ground.If it does then pressure needs tested with a fuel pressure test gauge threaded onto the test port on the fuel rail on the engine.The fuel pressure should be around 54 to 60 psi with the key on the first 2 seconds or when cranking the engine.If there is power and ground but no or low pressure then the pump needs replaced.
Make sure the fuel pump relay clicks the first 2 seconds the key is on.
In some cases you can have someone hit the bottom of the fuel tank around the middle with a hammer while you try and start the engine.If it starts or tries to start then the pump needs replaced.
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