Question about 1999 GMC Yukon
Actually i would use a test light. get under vehicle near fuel tank. find fuel pump connector. should be 4 wires, (gray,black,purple with white stripe,black with white stripe) back probe gray and black wires. attach test light onto these 2 probes. cycle ignition on, there will be a 2 second prime cycle for pump, test light should come on, also while cranking light should be on, if light works as stated, and no fuel pressure, THEN replace pump. if light NOT working as stated, swap fuel pump relay with another relay in relay boa(i.e. a/c compressor) if fuel pump now works, replace relay that was removed.
Posted on Apr 29, 2010
The fuel pump relay should have a schematic on it so you can check it with an ohm meter for a short. If it checks ok and when you turn the key on, you do not hear the pump then replace the pump
Posted on Apr 28, 2010
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Posted on Jan 02, 2017
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