gpchris Posted February 22, 2012 Report Share Posted February 22, 2012 Hey I need to drain a full tank of gas. I'm just wondering which of the 4 wires in the fuel pump plug are the power wires for the pump? Quote Link to comment Share on other sites More sharing options...
GOT2B GM Posted February 22, 2012 Report Share Posted February 22, 2012 Have the sending unit plugged into the car and apply power to the fuel pump jumper under the hood. Its a red wire hanging out by the MAF. Quote Link to comment Share on other sites More sharing options...
gpchris Posted February 22, 2012 Author Report Share Posted February 22, 2012 Have the sending unit plugged into the car and apply power to the fuel pump jumper under the hood. Its a red wire hanging out by the MAF.That's not really an option. I don't have the battery or engine wiring harness plugged up. If I hook a battery to that jumper wire and ground would it Pump? Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted February 22, 2012 Report Share Posted February 22, 2012 grey wire and black wire, pins F and A, assuming you're doing it near the C405 connector. Quote Link to comment Share on other sites More sharing options...
gpchris Posted February 24, 2012 Author Report Share Posted February 24, 2012 Thanks for both answers. I ended up grounding the body and sending power through the A2 pin of the c100. Quote Link to comment Share on other sites More sharing options...
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