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99 GMC Sierra fuel pump clicking sound

Discussion in 'General Chevy & GM Tech Questions' started by FrFtr28, May 21, 2010.

  1. FrFtr28

    FrFtr28 New Member

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    I have been having problems with my 99 GMC Sierra lately and I think it may be the fuel pump. The fuel pump is making a fast clicking sound when I turn the key to "On". Is that normal or does that mean the pump is bad?

    Thanks in advance.
    #1
  2. murdog94

    murdog94 New Member

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    WEll depending what else are the symptoms???? is the CEL on etc. Just a bit more info on what your problem is might help. And a click isnt always great but as i said there might be more to it than that.
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  3. FrFtr28

    FrFtr28 New Member

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    About a week or so ago my truck started acting like it was running out of fuel right after start up. It slowly started happening more frequently until it would stall out. The CEL gave P0171 and P0174 (System Lean Bank 1 and System Lean Bank 2). I replaced fuel filter and spark plugs and the problem still exists. It seems like if I let the truck sit overnight after stalling it will start and run fine for about 10 minutes and then stall. I also replaced TPS.
    #3
  4. murdog94

    murdog94 New Member

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    You check the fuel pressure?? Also the Fuel pressure regulator?? I am with you on the fuel pump but the are Expensive and i would hate to see you throw $300-400 into your gas tank when it is something else. Also have you cleaned out the AIC??? Oh and what motor do you have?? Does it start back up after it dies?? Basically does it do this once and go down the road and not do it till you start it again or will it not really even move??
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  5. FrFtr28

    FrFtr28 New Member

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    I don't have the means to check fuel pressure (no gauge). Not sure how to check the regulator. I found a pump on EBay for $65, not cheap but alot better than $300. What's the AIC? My engine is the 5.3. It will for about 10 minutes or so and not want to start back up, but if let sit overnight then it will start again like the pump has cooled down. Hopefully that answers all the questions.

    Thank you for your help!
    #5
  6. murdog94

    murdog94 New Member

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    Ok got ya.. well i would lean twards a pump as well.. And AIC is me typing to fast and actually is the IAC (idle air control valve) however with it starting and dying like that it sure sounds like it.. Make sure that you change the fuel pump wiring harness (in tank side)....
    #6
  7. FrFtr28

    FrFtr28 New Member

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    Here's the link to the one I got off EBay. It says it comes with a new wiring harness so I will be sure to replace that.

    Fuel Pump from EBay
    #7
  8. murdog94

    murdog94 New Member

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    Good luck and keep us informed.. ANd how many miles are on your rig??
    #8
  9. FrFtr28

    FrFtr28 New Member

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    I will post an update when I get the pump installed. There are 125,000 miles on my truck.
    #9
  10. murdog94

    murdog94 New Member

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    Asking because that is around the same miles that alot of people seem to need to replace their fuel pumps...
    #10
  11. FrFtr28

    FrFtr28 New Member

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    Just drove my truck home from where it has been parked the past few days (about 5 miles) and it ran fine except for a couple times of hesitation. Hopefully replacing the fuel pump fixes my problem, will find out later on this week.

    Also, I removed the vacuum line from the fuel pressure regulator and it was completely dry, no signs of gas.
    #11
  12. murdog94

    murdog94 New Member

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    Good then hopefully the pump will fix your problem as well.. I will be doing mine next week, and i get to deal with rust.. hopefully you dont.
    #12
  13. FrFtr28

    FrFtr28 New Member

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    Before I go ripping everything apart, is there a way to test the pump to make sure that it's gone bad? Would hooking up a fuel pressure gauge and watching it as I drive work to check the pump? Also, can i get to the connection at the pump to test that it's getting power without dropping the tank? I could see a connection between the bed and cab that I might be able to get to without taking anything apart, just wondering if that is where I can test for power.

    One more question, could all these symptoms be caused by a clogged catalytic converter?
    Last edited: May 24, 2010
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  14. FrFtr28

    FrFtr28 New Member

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    Just wanted to give an update. I drove the truck last night for about 30 minutes and it only hesitated a couple times. When I would really give it gas the RPM's would increase but there was no power, like it was in neutral. I am going to get a fuel pressure gauge today and take some readings while driving.
    #14
  15. FrFtr28

    FrFtr28 New Member

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    I got the pressure gauge, but I can't seem to thread the gauge onto the test port. I can't tighten it more than about a half turn with my hand, do I need to use a wrench to tighten it?

    Edit: So I'm an idiot, it helps if you attach the gauge to the right port. The pressure was in between 25 and 30 at idle and with revving the engine, so it is definitely the fuel pump. I will replace the pump and report back.
    Last edited: May 26, 2010
    #15
  16. FrFtr28

    FrFtr28 New Member

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    Replaced the fuel pump last night. I ended up lifting the driver's side of the bed enough to replace the pump. Lifting the bed was actually the easiest part of the job, messing with the rusty lock ring on the gas tank was a pain. Everything went smooth for the most part and now the truck is running like new.
    #16
  17. murdog94

    murdog94 New Member

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    Glad to hear it.
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  18. Dr_Zero

    Dr_Zero New Member

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    Good to hear you are back up and running :great:
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