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Gas Gauge....WTF?

This is a discussion on Gas Gauge....WTF? within the General Help forums, part of the LSx Technical Help Section category; my gas gauge has always read higher than what was in it.......when it said empty i usaully had 2-3 gal ...

  1. #1
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    Gas Gauge....WTF?

    my gas gauge has always read higher than what was in it.......when it said empty i usaully had 2-3 gal left........now it has totally turned around......fill up now shows 7/8 full.....and the gas light comes on when i have 4 gal left......would a new sending unit cure this? or is there some procedure to clean the contacts on the sending unit????

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    That guy thearborbarber's Avatar
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    Chevron Techron claims to clean the fuel gauge sending unit.

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    Gas light? You mean check gauges light? Sending unit is inside the tank and I wouldn't change it for a gal difference. Usually when they fail the gauge stays on full and doesn't drop. Be kind to your fuel pump and fill it before the check gauges light illuminates.

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    i meant...... the check gauges light........as it seems it only comes on when the gauge is low........but why has it gone wonky all of a sudden????

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    I have to tap on my cluster once in awhile..then gas gauge moves up about a 1/4..or it starts moving up & down...then tap..WTF!!

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    start off by running some fuel system cleaner through the car. If you've ever seen how that sender works you'll understand how easy it is for that thing to get cruded up. The other thing that might be happening is your vent purge solenoid is sticking and not letting you actually fill the tank all the way up.

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    where is the vent purge noid?

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    Quote Originally Posted by sjsingle1 View Post
    where is the vent purge noid?
    on top of the gas tank. not real easy to get to

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    Quote Originally Posted by Cutlass View Post
    on top of the gas tank. not real easy to get to
    I would have to look to be sure because I'm having a brain lock up now but I believe it's actually under the hood on the drivers side of the intake mounted between coils 1 and 3. I'm pretty sure that's the purge solenoid there.

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    For some reason the senders accumulate sulfer deposits from the fuel and they start to act up. As stated, the Chevron Techron fuel system cleaner is advertised to remedy this issue. Add the cleaner to an almost empty tank and then fill it with 12 gallons of fuel. Run it until almost empty again and repeat the process one more time if you do not get results from the first batch.

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    Electrical Engineer KMdef9's Avatar
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    Quote Originally Posted by pajeff02 View Post
    For some reason the senders accumulate sulfer deposits from the fuel and they start to act up. As stated, the Chevron Techron fuel system cleaner is advertised to remedy this issue. Add the cleaner to an almost empty tank and then fill it with 12 gallons of fuel. Run it until almost empty again and repeat the process one more time if you do not get results from the first batch.
    Don't pump gas at Uncle Bob's Fillin' Station, lol.

    I have had good luck with STP products in the past, so if you want to save a few bucks you could try a variation of products. They all recommend that you use them every oil change/3000 miles.

    I wouldn't bother with the Lucas Oil Fuel Injector Cleaner, seemed to make things worse on a previous vehicle I had.

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    Quote Originally Posted by 0rion View Post
    I would have to look to be sure because I'm having a brain lock up now but I believe it's actually under the hood on the drivers side of the intake mounted between coils 1 and 3. I'm pretty sure that's the purge solenoid there.
    yep the purge solenoid under the hood. The vent solenoid is on top of the tank near the canister, I believe. The vent solenoid would be the one that could cause the gas to not fill up all the way...easily. The gas pump will keep clicking off if the gas tank isn't venting the air out.

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    4 the f-body 3800-II the purge noid is on the drivers side of the UI behind and above the thermostat.. Just thought I'd add..
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    Quote Originally Posted by KMdef9 View Post
    Don't pump gas at Uncle Bob's Fillin' Station, lol.
    LOL..

    I had some strange issues like that after a long road trip which forced me to fill up at some less than up to date gas stations.

    A few tanks full of our local Quik Trip guaranteed gas fixed me right up.

    I think Shell has some detergents or whatever in their gas also.


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    ʢ ൧ ൨ ൩ ൪ ൫ ൬ ൭ ൮Ր Ց Ւ Փ Smittro's Avatar
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    Quote Originally Posted by gnomee View Post
    LOL..

    I had some strange issues like that after a long road trip which forced me to fill up at some less than up to date gas stations.

    A few tanks full of our local Quik Trip guaranteed gas fixed me right up.

    I think Shell has some detergents or whatever in their gas also.
    I believe you're correct.. Also, Exxon has the detergents too iirc..

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    Quote Originally Posted by 2001NBMZ28 View Post
    Be kind to your fuel pump and fill it before the check gauges light illuminates.
    How's that?

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    Quote Originally Posted by mbrownin View Post
    How's that?

    The fuel keeps the pump cool. Try to keep at least 5 gallons in the tank. We just discussed this in another thread recently.

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    put in a bottle of techron.......no change so far.......

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    still nothing...........

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    might be time to drop the tank and replace the fuel level sender

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