Question about 2006 GMC Envoy

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Fuel gauge inop on 2005 envoy

My fuel gauge needle stays on E and the fuel light stays on even though there's a full tank of gas. I've went to auto zone where they plugged my truck to a reader but no errors came up. we swithed the fuel relay but not help there either. wondering if the the problem is in the tank or maybe its something wrong on the dash. would it help adding some fuel cleaner to my tank? could it be the sending unit? please help, trying to avoid a costly repair.

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  • janet_chatma Jun 22, 2009

    how expensive will replacing the sending unit be. earlier i was told by a sales assistant that the sending unit was not sold separately from the fuel pump. i will have to purchase a fuel pump in order to get the sending unit

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Hi, this is a sending unit issue. you can try adding some Sea Foam additive to the tank. this may release the sender. if the additive doesn't work, replace the fuel level sending unit.

Posted on Jun 22, 2009

  • Michael Masters
    Michael Masters Jun 23, 2009

    This is true. the complete assembly will need to be purchased. it will run about

    $336.89(parts cost). the labor will vary between 60 to 85 dollars an hour.

    Usually takes about 2 hours to install.























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  • Master
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Run tank dry remove and check sending unit!!if ok then you will know its an guage or wiring issue!! If it has a float maybe punctured or stuck in down position!! Good luck!!!

Posted on Jun 22, 2009

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You will find it to be the sending unit in the tank the fuel gauges are pretty much bullet proof, and the enthonal in gas now days destroys the wiring on the fuel pump and sending unit.

Posted on Jun 22, 2009

  • Bruce Hathcock Jun 23, 2009

    it is possible it's just the float if so just replace the float, if its the sender pull the cover off locat the short or broken wire and solder it it will give you a slight jump in the gauge reading but it will work thru 90% of fuel range.

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