Mechanics

99 FUEL PUMP PROBLEM

1999 GMC Yukon • V8 4WD Automatic • 180,000 miles

I have a 99 yukon that I changed the fuel pump on. Car will turn over but no fuel from the pump, checked at the plug and no electricity, changed the relay and checked fuses but still no elect
Avatar
Ellobo11
July 1, 2011.



Engine cranking, do you have spark at the plugs and injector pulse? If your missing everything, check the crank sensor. The computer has to see an rpm signal. Any applicable trouble codes? How long since a tune-up?

The red wire in the diagram is a fuel pump test connector. No need to use the key. Use jumper wire from battery voltage to red wire connector, the pump should run. You should use an inline fuse with that. When you checked the applicable fuse, did you use a voltage tester?


JDL
Jul 1, 2011.