Quote:
Originally Posted by J-Ri
To test it further, run a fused jumper wire of the appropriate amperage to the "after" side of the fuse. All the fuses in that row of the box will get their power from the same side, so put it to the other side and see if it starts/runs. If it does, you can put the tank back up. You'll need a wiring diagram to see where the power for the fuel pump fuse comes from. Sometimes they go straight to B+ through a splice in the fuse box, other times they are one of several fuses that go through a larger fuse. That means that if you have checked every single fuse everywhere else on the car and the only fuse with no power to it is the fuel pump fuse, there is a problem in the wiring. Common places GM hides fuses from you include: Under the hood (can have multiple), both sides of the dash where the door closes against, under the dash, in the center console, under the rear seat, in the trunk. I havn't had to find them on a Cobalt yet, so check all those places for extra fuses, and don't look at it logically either (you need to think like an engineer). A wire can go from the battery and then through 3 fuse panels in different parts of the car before it goes to the device. You're getting very close to finding the problem, and it will probably be a cheap repair too.
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The only other fuses that didn't power were the lights.They work, so they wouldn't power I guess till they are turned on.But every other fuse had power.The fuel pump relay ( In the fuse block ) can be heard clicking when the key was turned on.I did put a total of 3 different relays in and also changed the fuse.I've had fuses that looked good before and weren't.Didn't want to make that mistake again. But no power to either fuse. Next time I can get at the car will probably be Monday.So I'll do all that you suggested. My buddy had a Cavalier that had the same problem.He couldn't find why there was no power to the fuel pump. he decided to junk it.Him and another buddy started to tear it apart. When they took the dash out, a wire from the ignition was off.It was too late for that car !!Thanks,appreciate the info.