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fluctuating gas gauge

This is a discussion on fluctuating gas gauge within the Technical / Maintenance forums, part of the General Discussion category; 2000 chevy 3500 pickup, fuel gauge pretty much reads whatever it wants lately. every now and then it seems accurate ...

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    fluctuating gas gauge


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    2000 chevy 3500 pickup, fuel gauge pretty much reads whatever it wants lately. every now and then it seems accurate and than it starts slowly creeping in either direction. i am going to check the sending unit ground as soon as the weather gets a bit warmer, its almost at zero degrees in good old wisconsin as we type. any help would be appreciated.

    joel

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    Re: fluctuating gas gauge

    As you are already thinking I would check your ground.
    Other then that it is most likey your guage.
    Now another question for everyone else, when did these start to have the problems with the clusters?
    Could be that too. I just don't know when they started to have problems with the clusters.


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    Registered User 89ChevSS's Avatar
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    Re: fluctuating gas gauge

    i heard with chevy's that the gas gauge being goffy is the first sign that your fuel pump is going cause the sending unit is not working properlly... i heard this from my brother who is a good mechanic!! but i could be wrong...

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    Re: fluctuating gas gauge

    I won't disagree, but althgouh some of them are one part replacement, (unless I am wrong) the pump should have nothing to do with the sending unit. Different circuts. (should be atleast)


    03 Silverado ECSB, Dmax, Allison, 3.73 G80
    96 Silverado ECSB, 350, 4L60E, 3.73's Powertrax Locker
    05 Cavalier
    74 Corvette Stingray, 350, 4 speed
    49 F-1, flathead 6, 4 speed, 2wd, unknown rear end. Old rust bucket.

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    Registered User 2500ak's Avatar
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    Re: fluctuating gas gauge

    Come to think of it, mine used to do that but hasn't since I had the pump replaced.

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    Re: fluctuating gas gauge

    Was it just the pump or a pump/sending unit?


    03 Silverado ECSB, Dmax, Allison, 3.73 G80
    96 Silverado ECSB, 350, 4L60E, 3.73's Powertrax Locker
    05 Cavalier
    74 Corvette Stingray, 350, 4 speed
    49 F-1, flathead 6, 4 speed, 2wd, unknown rear end. Old rust bucket.

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    Registered User 2500ak's Avatar
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    Re: fluctuating gas gauge

    It started way before the pump went. Every so often it would jump around, sometimes coming to rest on empty until I hit the door panel with my knee. It would rock the truck and it would start working again for some reason. Started getting more frequent then finally the pump gave up on me.

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    Re: fluctuating gas gauge

    Sounds like your was just the sending unit.
    Was it all one piece? (pump/sending unit)


    03 Silverado ECSB, Dmax, Allison, 3.73 G80
    96 Silverado ECSB, 350, 4L60E, 3.73's Powertrax Locker
    05 Cavalier
    74 Corvette Stingray, 350, 4 speed
    49 F-1, flathead 6, 4 speed, 2wd, unknown rear end. Old rust bucket.

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    From Mini to Fullsize.... Hotwheelz's Avatar
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    Re: fluctuating gas gauge

    it's just the sending unit. pump has nothing to do with it.
    2009 GMC SIERRA | SLAMMED 5/7 | 22" BOSS 330'S | ASE MASTER CERTIFIED

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    Registered User 2500ak's Avatar
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    Re: fluctuating gas gauge

    Not sure, it was under warranty and I had to get back up to college, didn't have time to mess with it myself.

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    Re: fluctuating gas gauge

    Hotwheelz
    I know the sending unit has nothing to do with the pump, what I am trying to get at is, can you get just a pump or do you have to get both?
    That would make sense in 2500ak's case.
    I don't know if you can get them separate or not.


    03 Silverado ECSB, Dmax, Allison, 3.73 G80
    96 Silverado ECSB, 350, 4L60E, 3.73's Powertrax Locker
    05 Cavalier
    74 Corvette Stingray, 350, 4 speed
    49 F-1, flathead 6, 4 speed, 2wd, unknown rear end. Old rust bucket.

  12. #12
    Astute as fek. DarkCharisma's Avatar
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    Re: fluctuating gas gauge

    My '00 does this too, will sit on full for 150mi then go down to right above half, it's pretty accurate from there.

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    Re: fluctuating gas gauge

    I have a 2000 obs chevy 2500 gas. I did mine about 2yrs ago.(it was one piece) I was told the 98-01 obs trucks all have the updated pump. That means the pump and the sending unit are both together.

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    From Mini to Fullsize.... Hotwheelz's Avatar
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    Re: fluctuating gas gauge

    i THINK they are two pieces, reason being is, the dealership replaced my sending unit when i bought the truck b/c it was bad. (and i was not buying a truck with a non working gas gauge). well the pump went out about 6 months later. I'm thinking that if it was all one piece on my truck then the pump wouldn't have gone out so soon.
    Last edited by Hotwheelz; 02-21-2008 at 12:10 PM.
    2009 GMC SIERRA | SLAMMED 5/7 | 22" BOSS 330'S | ASE MASTER CERTIFIED

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    Registered User masintenn's Avatar
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    Re: fluctuating gas gauge

    They come as either a pump or pump and assembly. I don't know why anybody would bother taking apart a years old crappy plastic assembly to replace the pump.

    I've had several fuel pumps in my truck and the AC Delco gives the best gauge reading.


    '96 Tahoe...5.7 Vortec...4wd...~205,000...Stock

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    Re: fluctuating gas gauge

    97 and older you can get the individual parts, after that you have to buy the whole module, i also agree whth why yould you not do it allif you have it out, especially since these pumps dont last anyway, and dont use anything but ac delco, the rest are junk
    mechanic by trade, enthusiast by hobby

    2000 tahoe z-71,5.7 vortec obs
    87 monte ss, 355 ci. vortec carbed

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    Re: fluctuating gas gauge

    also to add to my last post 97-2000 old body style gage clusters are pieces of sh@t also many problems with fuel and oil gages too
    mechanic by trade, enthusiast by hobby

    2000 tahoe z-71,5.7 vortec obs
    87 monte ss, 355 ci. vortec carbed

 

 

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