Question about GMC Cars & Trucks
In the under hood fuse box ! Fuse # 12 it's a 20 amp fuse . There is also fuel pump relay . Located in the same under hood fuse / relay box . #57 relay . The relay is computer controlled ! If the fuse is good you may want to watch this video on testing GM fuel pump electrical circuit . GM Fuel Pump Relay Testing
Posted on Dec 09, 2016
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Posted on Jan 02, 2017
The fuse is actually a Relay Switch and its located in the Fuse Relay Center on the driverside of the engine compartment. The Black Box is labled Fuse Relay Center, the diagram on the cap displays which Relay is the Fuel Pump relay...the Relay switch is usually $8-$15 depending on where you shop
Posted on Jul 28, 2009
The manufacturer does not even publish a troubleshooting chart for this. (At least, not a chart that is not associated with a computer fault code)
Most of the things that will cause your vehicle to not have spark will also cause your engine to not receive fuel. (no injector pulse) The only things I can think of would be a bad ignition coil, or a bad distributor cap and/or rotor, or a bad ignition control module. Depending which engine your van is equipped with, there should be an ignition control module located near the ignition coil. I would check for spark at the coil. If there is spark at the coil and no spark at the plugs, replace you cap and rotor.
If there is no spark at the coil, it could be caused by several things, but if you are certain that you have injector pulse, the most likely would be the module. (coil failures do happen but are more rare)
Posted on Jan 30, 2011
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