Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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The power lead to the fuel pump is the grey wire. the ground is the black wire. Connect the 12V test lamp to the battery 1st to make sure the test lamp is good. If test lamp is good, hook the clamp end to ground (I like to use a long piece of wire connected at the battery ground so that I am sure that I have a good ground) and the other end of the tester connected at the grey wire. Turn the key to the on position and the test lamp should light for 3-5 seconds and go out. This will tell you wether or not you have power at the fuel pump.
I do not have that information here with me at home, but there should be one wire that is always hot (12v) and another that will turn hot with the key turned on. I can get you more information when I can get my hands on a manual at home. If there are wiring schematics in your manual, there should be one on the wiring for the fuel system.
If you can see the wiring at the back of the relay, you can look for the grey wire.