Question about Cars & Trucks
Posted by Anonymous on
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Posted on Jan 02, 2017
The fuel pump relay switch is located on the firewall, behind a plastic cover. It is a black plastic 1 inch by 1 inch switch with a four or five wire plug. It is designed to operate the fuel pump for 3 to 8 seconds when you turn the ignition switch on to prime the injector rail hope u find it
Posted on Feb 18, 2009
SOURCE: 2003 GMC Yukon - fuel pump
Check your ECM fuse. There should be 2 fuses for your ECM. It's the ECM that controls the function of the fuel pump. Good luck friend and it's also common for the wire harness from the frame to the fuel pump to go bad due to corrosion from the bad weather we get in the winter and rainy spring and fall.
Posted on Sep 04, 2009
drop the tank ... use a brass punch to loosen the ring ... to find/replace the pump.
the relay is operated by the computer ...
Check for volts on the outgoing side of the relay ...
check for signal on the input side
check the pressure regulartor ...
If you are still interested ... there is lots more to this. If you are getting weak knees ... remember after you drop the tank and remove the fuel pump ... you are stuck
Posted on May 02, 2010
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