Question about 2003 GMC Sonoma Extended Cab

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2003 sonoma, 4.3. ran fine, one morning tried to start, heard a pop" not in the motor" would turn over but not start, fuel pump made no sound in "on" postion or when starter was bumped. Changed pump still not working, no power going to pump. relay does click. Does this truck have an anti-theft that kills the fuel pump? or am i missing something here?

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There is nothing in the circuit after the relay, however, hearing the relay doesn't mean the power is available to run the pump, as the pump circuit is separate from the relay solenoid. The pump needs power from the 20 amp "ECM B" fuse. If you probe the relay socket with a test light, there should be 2 hot terminals--one from the PCM and one from the ECM B fuse. See diagram below.

If the power is there, are you sure it's the fuel pump relay that you hear clicking? If there are other relays in the box, it may be one of them that's coming on. Try swapping the pump relay with another one. Let me know if you get stuck or have more questions.

2003 sonoma, 4.3. ran fine, one morning tried to - jturcotte_87.gif

Posted on Nov 07, 2010


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