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Thread: Fuel Pump Problem ? Thoughts
03-11-2012, 09:05 PM #1
- Join Date
- Jun 2010
Fuel Pump Problem ? Thoughts
I've posted a couple times before, but nothing recently (because the suburban has been running well ! ).
However, I've got a couple questions and want to get the forums thoughts.
I've got a '99 K1500 with the 5.7 (136,000miles).
Lately the suburban has been not wanting to start (starter sounds strong when cranked). I believe this has to do with the fuel pump not turning on - when it doesn't start, I definately don't hear the loud whir noise from the rear. No specific weather or driving conditions that I've noticed when it doesn't start. Sometimes it will be after a short trip or sometimes after it has sat overnight. When it doesn't start - If I wait to start it for several hours and try again, it almost always starts up with the whir noise, although sometimes not as loud.
to me it would seem no whir, no gas being pumped - either bad pump or no/minimal voltage or bad ground.
What does the waiting for a couple hours and then starting mean?
My plans at this point are to replace the fuel pump, fuel filter, and fuel relay (although it's not likely that all of them are bad, it probably wouldn't hurt while I'm working) and to check the voltage at the pump and ground - unless the above conditions are really specific to one problem. I don't have a fuel pressure tester, but could get one if really needed.
Anyone deal with a similar situation?
Also, it seems like the delco replacements are good - I've read about matching it to the VIN - what does this mean?
Is there a better pump than the delco?
Thanks in advance!
03-11-2012, 09:13 PM #2
IMO: there is no better gm factory replacement than Delco (except batteries)
On your issue though, I think you've pretty much got your bases covered... It being intermittent (for me) points in the direction of a connection issue somewhere, whether it be on the pump inself or a fuel relay going bad is another story. I've never personally worked on a GM pump as of yet, but most systems are fairly similar and I've done several on my 240's and other vehicles. Most of the time there is a connection issue at the pump. At 136k i can see this being true in your case.
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03-12-2012, 08:36 PM #3
Check fuel relay contacts maybe weak.
03-13-2012, 08:35 PM #4
- Join Date
- Jun 2010
Thanks for the responses!
03-16-2012, 07:58 PM #5
Get as close to the fuel tank as possible when someone else is cranking the engine. Or better yet have them just turn the key to the run position; you should hear the pump start to build up pressure. If you don’t the pump is shot, if you do then check the pressure before the filter then after the filter. Low pressure before the filter means the pump is going, low pressure after the filter if you have high pressure before the filter means the filter is clogged.
Always check the fuses for the pump first before doing any of this.
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