Question about 1999 GMC Yukon

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How do i check the fuel pump relay and the fuel pump to see which is the bad part on a 99 Yukon 4x4, 4 door model?

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Actually i would use a test light. get under vehicle near fuel tank. find fuel pump connector. should be 4 wires, (gray,black,purple with white stripe,black with white stripe) back probe gray and black wires. attach test light onto these 2 probes. cycle ignition on, there will be a 2 second prime cycle for pump, test light should come on, also while cranking light should be on, if light works as stated, and no fuel pressure, THEN replace pump. if light NOT working as stated, swap fuel pump relay with another relay in relay boa(i.e. a/c compressor) if fuel pump now works, replace relay that was removed.

Posted on Apr 29, 2010

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The fuel pump relay should have a schematic on it so you can check it with an ohm meter for a short. If it checks ok and when you turn the key on, you do not hear the pump then replace the pump

Posted on Apr 28, 2010

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Posted on Jan 02, 2017

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Fuel pump relay on gmc 7500 2003 with gas engine?


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How to manually jump a fuel pump from the fuse box ... Is this the same on the 2003 cavalier chevy? ... I go through fuel pumprelays often on my 99 GMC Yukon Denali. ... Finally, fuel pressure totally drains after motor turns off. ... run right, it would sputter when you hit the gas and finally just would not start.Missing: 7500

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Not getting any power to the fuel pump 1995 GMC Yukon 517 later


If you actually have NO power at the pump and the fuse and relay are good, then there is a break in the wire between the fuse block and the pump but most likely it is a bad fuel pump

Feb 17, 2014 | 1995 GMC Yukon

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Fuel pump won't turn on


Have you checked the fuel filter by chance?

Jun 03, 2017 | 2004 GMC Yukon

1 Answer

My 99 yukon just shut off while driving and wont crank back up


If the engine cranks. Possible fuel pump not working.. Turn key and have someone listen at the filler cap to listen for the fuel pump buzz.. If no buzz fuel pump bad

Jan 06, 2011 | 1999 GMC Yukon

3 Answers

My Son's ran our 2001 Yukon out of gas. After refilling it still will not start is their a reset switch or a trick like the oil change light?


The fuel pump should have brought fuel up to the engine almost straight away.I have a feeling that you should get the fuel pressure checked at the rail.I think when your son ran out of gas he might have burned the fuel pump out.The lubrication and cooling for the pump is actually provided by the fuel itself.I think you're looking at a trip to the service centre.Good Luck

Nov 09, 2010 | 2001 GMC Yukon XL

3 Answers

I have a 1996 yukon 4 door it wont start thought it was the pump becuase i didn't here it dropped the tank and checked it by running wires to it and it works checked the wires and there is no power spayed...


You did that the hard way
If you had a wiring diagram,you could have started anywhere in the fuel system,checking as you went,until you had no voltage drop.
You could also have found a place, to put power to the pump, without removing the tank
There is a fuse,relay in most cases,fuel pressure regulator,etc in all vehicles. Have to know where and what to test.
Your working blind with no print of a system, your not knowlegable of.

Oct 03, 2010 | 1996 GMC Yukon

3 Answers

99 yukon 180,000 mi. doesn't start. cranks forever, but won't start. Should I be able to hear the fuel pump when I turn on the key?


yes you should be able to hear the fuel pump run for about 5 seconds once the key is turned to the on pos. check to make sure you have spark. if you do try having someone spray air intake or carb cleaner into intake manifold while you crank. If the truck starts right up for a second (or stays running as you keep spraying) Id say you have a bad fuel pump and id change the sending unit also. (First check the fuel pump fuse and fuel pump relay) GMC and Chevy are nororiously known for having bad fuel pump/sending unit problems. I have prob changed over 60 myself.

Nov 30, 2009 | 1999 GMC Yukon

2 Answers

2003 GMC Yukon - fuel pump


Have you verified voltage at the fuse and fuel pump relay. There is one fuse in the underhood fuse box.
Let me know.
Regards,

Sep 04, 2009 | 2003 GMC Yukon XL

1 Answer

1997 Gmc yukon fuel relay switch continues to burn out. Replaced fuel pump twice and also took it the dealer but no solutions. Truck runs fine for sometimes weeks but the problem continues.


I would have to check the fuel pump with a scope to look at the pattern and check the amps it is drawing . the grounds need to be checked and the pcm checked and reflashed. on the fuel system that would affect the fuel pump and relay to where it would burn it out is grounds , pcm , fuel pump , fuel pump relay. so you should convince them to replace the fuel pump and fuel pump relay under warranty and replace the pcm . and get a diagram and check all grounds. If the pcm is damaged and the current has been affected and instead of say a 5 volt or 2 volt signal it now has a 13.5 volt signal or if a ground is out then the temp of the relay will keep rising non energized a relay is about 99 energized it is around 140 you can check to see how hot that relay is getting. and if i remember correctly you want the pcm drivers checked.

Jun 17, 2009 | 2001 GMC Yukon XL

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