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Thread: No power

  1. #1
    Sr. Mechanic
    Join Date
    Jun 2011
    Location
    Tuscaloosa, AL
    Posts
    160

    Default No power

    For about 2 months now sometimes when my tank of gas get to about an 8th left I start having problems. I'll lose all my power going down the road and the rpms drop to almost idling. I need to know do you think its built up trash or water. I've had the truck over a year now and it didn't start til about August
    2004 GMC Sierra SLT 6.0L 4x4
    UWS Low Profile toolbox 10% tint front and over stock back tint
    AirAid MIT and K&N airfilter
    BlackBear Performance

  2. #2

    Default

    Have you changed your fuel filter? They should be done roughly every two oil changes... Also, these trucks aren't made to let the tank run low. You can burn out your fuel pump because they're made for the fuel inside the tank to cool the actual pump.
    00 Chevy Tahoe LT, 5.3 4x4

  3. #3
    Sr. Engineer
    Join Date
    Oct 2010
    Location
    Indianapolis, In
    Posts
    493

    Default

    Seems odd that it only occurs at an eigth tank so I would not suspect water as it would be at the bottom all the time. Same goes for fuel filter, not at all likely to glog and unclog along with fuel level. Maybe bad level gage or float but if run low I would have expected it to quit running and not limp along. Perhaps a failing pump or small hole in pick up at those levels?
    2000 GMC YUKON SLT, 5.3L tow pkg, G80 rear/w 3.73 gear

  4. #4
    Sr. Mechanic
    Join Date
    Jun 2011
    Location
    Tuscaloosa, AL
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    160

    Default

    I guess yeah it could be the fuel pump because there is a whining noise at certain speeds when i'm on the gas. Correct me if I'm wrong but aren't there 2 on these trucks? how hard would it be replace one?

  5. #5

    Default

    This doesn't help you with your current issue, but you should NEVER run your truck below 1/4 tank of fuel. It will shorten the life of the fuel pump by half if you do it enough!

    That said, you might have a small hole in the line that becomes exposed once the fuel level drops down that low. To see it first hand... Pop a hole in a drinking straw and try to drink from it.
    "It went together didn't it? Well then there has to be a way to take it apart!" - Me.

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  6. #6
    Sr. Mechanic
    Join Date
    Jun 2011
    Location
    Tuscaloosa, AL
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    160

    Default

    Haha good example alright I'll try and fill up before I get to that point. She is always so thirsty

  7. #7

    Default

    Some good suggestions, have you considered, that it may be empty when it reads 1/8th, maybe your sucking air.
    Ray

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

  8. #8

    Default

    Quote Originally Posted by sierra11 View Post
    Haha good example alright I'll try and fill up before I get to that point. She is always so thirsty
    I understand thirsty trucks. I fill mine when it drops to 3/4 tank... 3/8 tank while on the road. (that's a quarter plus half of a quarter or exactly between 1/4 and 1/2 of a tank for those not two gud with fractions! LOL!)

  9. #9
    Sr. Mechanic
    Join Date
    Jun 2011
    Location
    Tuscaloosa, AL
    Posts
    160

    Default

    Yeah I guess I should just fill her up at 1/4. No I didn't think it was sucking up air cause it will go away after a minute.

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