Question about 2003 Chevrolet Silverado 1500

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Fuel pump runs continously. Where are the relays?

Clock also reset itself to 1200! No check engine light showing.

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The ralay should be in the under hood relay box or under the steering colum in a fuel box. the fuel relay seem to be bad and the oil pressure is keeping the pump running.

Posted on Dec 31, 2008

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If the old fuel pump failed, it may have blown a fuse or damaged a relay, so check those first. Your owner's manual should show where to find them. Usually, you can borrow a relay from another circuit for testing purposes.

Then, you need to determine if the wire from the engine compartment to the fuel pump is receiving power. A $3 test lamp with thin probes at each end should answer that question. While the engine is cranking, touch one end to what should be a "hot" connection and the other end to a good ground -- if the lamp lights, you've got juice.

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If you're satisfied that the wiring, pump, connectors, fuses and relays are all OK, then the engine computer probably isn't activating the fuel pump relay for reasons best known to itself. Assuming the computer itself is receiving power (check fuses and relays), then you'll need to do some systematic electrical diagnosis, since there are many sensors that influence the computer's decision-making process.

Your best bet is to find an online forum for your truck. Since it's such a popular vehicle, there's likely to be many forums ... with other people who have encountered similar problems, and solved them. A factory service manual also may help to troubleshoot electrical problems.

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