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I have a 2006 Chevy Uplander fuel pump issues we have replaced the pump and the four wire plug at the pump and up graded the gro
und.The pump will pump before we reinstall it but it won't pump when reinstalled. Any help will be appreciated.


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your fuel pump wire harness has two wires that power up your fuel pump. the gray wire is the power from the fuel pump relay and the black wire is for the ground. You need to verify that you are getting a good power signal and ground signal. if you connect the two wires to a test light then you could see if the test light lights up when the fuel pump should come on. You can check to see if the relay in the underhood fuse box is clicking to turn on the pump.

check the fuel pump fuse #2 a 15A fuse. the relay appears to be made into the fuse box because the wiring diagram does not show connector pins but verify that by looking at you owners manual for the fuses and relays and see, if it shows the fuel pump relay location and then if it is available, the relay is working. The ground for the relay is the ground stud at the engine to transmission bolts. Power to activate the relay comes from the computer.


   
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