Question about 1995 GMC Yukon
What you need to do is go to the connector for the fuel pump. Note when the key is cycled the power will be supplied to one of the wires for 3 seconds. For GM its usually the gray wire. You need to hook up a meter to see if you gets voltage. If you do, you have a defective replacement. Very commom.
Find the fuel pump relay in the underhood fuse block. Rotate it with the horn relay if you have no power. These trucks use oil pressure as a back up power source. If the fuel pump relay or fuse dies the car will continue to run but will not restart unless you crank it long enough to create oil pressure.
Posted on Jul 24, 2009
First check the fuse for the fuel pump if it is bad chances are there is either a short or the pumps pressure valve is faulty and the pump continues to run overheating and blowing out the fuse, fuses don't just blow for no reason if it is blow it is a symptom of a larger problem, you can try replacing the fuse but chances are it will blow again, forgive me if some of the information given appears redundant I prefer to give more information needed rather than less. You must unplug the fuel pump plug clean with electrical contact cleaner check with a voltmeter set on 10 amp DC to ensure after check and change fuse that there is 12 - 14 volts present on one of thewires probaly the red or green wire, make sure you ground the black probe of the voltmeter while using the red probe to check for power at the plug to fuel pump this will tell you if the pump is faulty, if the plug has power the pump you bought was a lemon and needs replacing again, it is also possible the ground is bad however unlikely. to check switch the volt meter to the symbol that looks like a bell or ohm symbol this will allow you to test for continuity on the plug which has groun wire. when you set the meter to this setting touch the two probe wires together it should go to 0 this means there is goo continuity through the circuit same principal in regards to checking the plug's ground, identify the two wires on the plug that are ground or have no power to them then touch the two probe wires to them to check to see if the reading goes to close to zero it should if not there is probably a bad groung somewhere back through the harness, this would be a unusual condition but it may be the problem. The pump should run for about 3 - 5 seconds when the ignition key is enegized so listen closely in a quiet environment. I hope this is helpful.
Posted on Jul 24, 2009
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Posted on Jan 02, 2017
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