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  1. #1
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    Default Fuel Gauge problem

    Can anyone help me resolve an inaccurate fuel gauge problem on my 03 Anniversary convertable. The tank is full but he gauge indicates just over a half tank. The car is stored at least 6 months and only has 14,000 miles.

    Thanks in advance,
    Jerry

  2. #2
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    Quote Originally Posted by hubbajr46 View Post
    Can anyone help me resolve an inaccurate fuel gauge problem on my 03 Anniversary convertable. The tank is full but he gauge indicates just over a half tank. The car is stored at least 6 months and only has 14,000 miles.

    Thanks in advance,
    Jerry

    Common problem due to build-up on the gauge floats. Try some Techron additive (available at any parts store) to dissolve the build-up. It may take a little while, but many have found this fixes the problem. Also, Chevron gas has this additive in the fuel, so will prevent it from coming back.

  3. #3
    Member gmjunkie's Avatar
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    Use Techron PLUS!! Works Better and faster than regular Techron!!
    I usually run Chevron Fuel and have no problems till I can't find it on the road,so I keep a couple bottles in the car for when I can't find it on a trip!!
    It's got so it seems to me that the Internet has created a lot more Horses A$$'s than we have Horses!
    junk!~!!
    Founding Member: 10 Corvettes Anonymous


  4. #4
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    gmjunkie, I noticed that you posted a pic of the 12 gallon label. Do you use the 12 gallon size? I use the 20 gallon size.

    2000 Torch Red Coupe

  5. #5
    Member gmjunkie's Avatar
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    Quote Originally Posted by leftyvette View Post
    gmjunkie, I noticed that you posted a pic of the 12 gallon label. Do you use the 12 gallon size? I use the 20 gallon size.
    Normally,I get the 20 gallon bottles, but the last couple times I've bought it,it's been on sale 2 for 1!! 2/12 gal bottles for $6.95, so I buy a couple 12 bottle cases!! I never let my car get below 1/3-1/4 tank anyway and thats usually 10-12 gals of gas!! Besides,I've been getting well above 30 MPG on the road and my kidneys won't last that long anyway!!
    It's got so it seems to me that the Internet has created a lot more Horses A$$'s than we have Horses!
    junk!~!!
    Founding Member: 10 Corvettes Anonymous


  6. #6
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    A short while ago I noticed a bottle of "GM Fuel Tank Additive" sitting on a display shelf at my local GM dealer. I asked the parts guy what it did and he said it dissolved a "sludge build-up" on the fuel gauge float. Of course when I asked the price it was like $24.95 a bottle or some nonsensical price close to that. Anybody try this stuff? I have consistenly used Techron in my C5 and have had no fuel gauge problems. I would like to know the GM part number for their stuff so I can see what GM Parts Direct gets for it.

  7. #7
    Member DennisC5's Avatar
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    GM Fuel System Treatment Plus, P/N 88861011

    I use Techron Plus when I can't get Top Tier fuel.

  8. #8
    Member gmjunkie's Avatar
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    Quote Originally Posted by bumblbe View Post
    I would like to know the GM part number for their stuff so I can see what GM Parts Direct gets for it.
    Why not just use Techron Plus, It's the same stuff except for the GM Packaging!!
    It's got so it seems to me that the Internet has created a lot more Horses A$$'s than we have Horses!
    junk!~!!
    Founding Member: 10 Corvettes Anonymous


  9. #9
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    Quote Originally Posted by gmjunkie View Post
    Why not just use Techron Plus, It's the same stuff except for the GM Packaging!!
    I want to Thank You ALL for the info.... I have added Techron to a full tank and have driven 30 miles... I am sure it will take a little time to dissolve the crap on the sending unit.. Enjoy your ride. Mother Hubbard http://www.corvetteactioncenter.com/...es/blinzel.gif

  10. #10
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    could not get my fuel gauge to come around with additives, had to pull pump and sending unit and replace---verg common on gm cars

  11. #11
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    OP also said car stored 6-months a year. Car should be stored with a full tank. I don't think you need Stabil for the fuel but should be full tank. I also try not to go below 1/3 tank or park it more than a week with a low tank. Techron is a must - fuel system cleaner. I also use the Fuel Injector cleaner once a year or so.

  12. #12
    Technical Advisor c4c5specialist's Avatar
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    HI there,
    HOLD ON HERE>

    The owner did NOT post the last 6 digits of his VIN.

    If he has the FFS fuel system, he may need a recalibration of the PCM.

    Techron plus will not help a calibration issue.

    Allthebest, c4c5
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  13. #13
    Member timfitz63's Avatar
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    Quote Originally Posted by napacruzerC5 View Post
    OP also said car stored 6-months a year. Car should be stored with a full tank. I don't think you need Stabil for the fuel but should be full tank. I also try not to go below 1/3 tank or park it more than a week with a low tank.
    Hmmm. Owner's manual (2004 edition) doesn't mention any of this...? 'Course, it doesn't seem to cover long-term vehicle storage either... Not sure why short-term storage (week or two) with less than a third of a tank would be an issue either.

    My current job frequently takes me out of town, so sadly, mine tends to sit more than it gets driven at the moment. And it's generally sat with whatever fuel has been in the tank (usually with some Stabil added); never had any fuel indication issue yet (knock on wood...). But maybe I should start keeping the tank full...?

    For what it might be worth, I've got a 1997 Jimmy that seems to do the exact opposite: reads correctly as fuel is burned from "FULL" to "HALF," then reverses as fuel continues to burn such that at "EMPTY" the gauge is reading "FULL" once again... That truck doesn't get nearly the kind of gas mileage to make that believable...

  14. #14
    Member Gripey's Avatar
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    Hey guys...so, I'm having a similar problem. When I fill my tank my gauge reads great until it drops to 1/2-3/4 of a tank and then it drops to empty and my check gauges light comes on. Filler her up and it does the same thing.....any ideas?

  15. #15
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    Not only did I have to pay $800.00 for the vette to replace sending unit and pump but also on my 2001 chevy blazer. Took gm up the tube twice!!

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