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First SS!!! Help fixing gas gauge

This is a discussion on First SS!!! Help fixing gas gauge within the General Help forums, part of the LSx Technical Help Section category; Just bought my first ss red 115k 6speed ttops short shifter center force stage 2 dynomax exhaust 4:11 gears new ...

  1. #1
    Junior Member khickenwang's Avatar
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    First SS!!! Help fixing gas gauge

    Just bought my first ss red 115k 6speed ttops short shifter center force stage 2 dynomax exhaust 4:11 gears new struts around blah blah. Only thing is my speed odo is 15 miles fast (is it due to gears?) and my gas gauge doesnt work. have to fill up and hit trip meter? How much is it to fix and where??? And how do I gt speed odo recalibrated and how much?? o yea paid 5k for ss

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    TJEA Retirement Home Dr.Crash's Avatar
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    most likely its the gears. Do you have stock wheels/size? you can find a local tuner to help you with the recalibration, they might be nice and only charge you $100. That's if there are nice. Or since you are going to spend the money you could do a mail order tune from FROST and he could fix that and give you a little more. So the gauge goes too far? Where in cali you live?

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    mine goes too far every time i fill up its usual for that to happen for me

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    TJEA Retirement Home Dr.Crash's Avatar
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    Quote Originally Posted by 10spokess View Post
    mine goes too far every time i fill up its usual for that to happen for me
    Ya thats what i was thinking, so does mine. But im not sure if thats what he meant.

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    The sending unit is part of the fuel pump. Kind of a pain to do but worth it for a working gas guage.

    Like said above, it is the gears especially if you have stock tire sizes. I would recomend going to tunedbyfrost.com to get the PCM tuned. It will get you more horse power with your mods unless its already been tuned.


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    Your gas guage will never be right if you do fix it, you should keep your tank above half tank anyways. Fuel pumps hate people who depend on the light

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    Quote Originally Posted by Conflict View Post
    Your gas guage will never be right if you do fix it, you should keep your tank above half tank anyways. Fuel pumps hate people who depend on the light
    Hmm I did my fuel pump and my guage reads fine.. Usually it's better to not go below 1/4 tank but to each their own.. I would definelty not wait for the light tho..
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    Quote Originally Posted by gnomee View Post
    The sending unit is part of the fuel pump. Kind of a pain to do but worth it for a working gas guage.

    Like said above, it is the gears especially if you have stock tire sizes. I would recomend going to tunedbyfrost.com to get the PCM tuned. It will get you more horse power with your mods unless its already been tuned.
    and this...

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    Quote Originally Posted by Smittro View Post
    Hmm I did my fuel pump and my guage reads fine.. Usually it's better to not go below 1/4 tank but to each their own.. I would definelty not wait for the light tho..
    i meant accurate reading,my half tank is about 5 gallons...

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    Quote Originally Posted by Conflict View Post
    i meant accurate reading,my half tank is about 5 gallons...
    oh my bad

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    Junior Member khickenwang's Avatar
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    yea my tank stays on empty even when I fill it up? So what do I fix? gas gauge or fuel pump?

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    Junior Member khickenwang's Avatar
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    Quote Originally Posted by Dr.Crash View Post
    most likely its the gears. Do you have stock wheels/size? you can find a local tuner to help you with the recalibration, they might be nice and only charge you $100. That's if there are nice. Or since you are going to spend the money you could do a mail order tune from FROST and he could fix that and give you a little more. So the gauge goes too far? Where in cali you live?
    I live in bay area (nor cal) richmond

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    Quote Originally Posted by khickenwang View Post
    yea my tank stays on empty even when I fill it up? So what do I fix? gas gauge or fuel pump?
    Your gas gauge is basicly a volt/ohm meter can't remember which. I believe the sending unit in the tank sends a voltage or ohm reading to your guage which in turn shows the fuel level of the tank. I'd try maybe trying to locate the sending unit wires and test for voltage/ohms. Only way I can think to do it really.. You could prolly test it @ the tank harness plug that is located on the drivers side inside the axle tunnel.. Or locate a schematic of your wiring for an easier test site. I honesly don't think it's your gauge. But they can go bad just not all that common. Most times it can be traced to a stuck/sticking or bad sending unit. In which case (if it is the sending unit) you will have to drop the tank to fix it..

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    my gas guage went out at about 100k....about 100 miles after that, my fuel pump went out. Changed out fuel pump, gas guage worked again. I'd be willing to put money on it being the sending unit on the fuel pump. At 115k, it's almost inevitable that you will have to replace the pump soon anyway...just my opinion. I've had my car from 88k to now 175k, so I've been through everything external minus power steering and rear end on my SS over the last few years.

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    The in tank level sensor should read about 40 ohms empty and 250 ohms full.

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    Junior Member khickenwang's Avatar
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    how many miles do you get on a full tank of gas in a 98 ss?

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    Depends on your driving style. If its all city and you keep your foot out of it, 200 or so.

    If its all highway then you should have no problem getting 240 - 320.

    As long as you were not at the track or running WOT everday I think you could fill up every 200 miles and never get close to empty.

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    [QUOTE=gnomee;2241852]The sending unit is part of the fuel pump. Kind of a pain to do but worth it for a working gas guage.

    Like said above, it is the gears especially if you have stock tire sizes. I would recomend going to tunedbyfrost.com to get the PCM tuned. It will get you more horse power with your mods unless its already been tuned.[/Q

    how many horses should my mods add to my stock 320????

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    I'm not real familiar with the dynomax exhaust but thats the only mod you listed that will add horsepower. Maybe 10-15... Someelse will chime in with a better idea.

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    Junior Member khickenwang's Avatar
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    just talked to the owner and he said he replaced the sending unit and fuel pump 2 weeks ago from general motors. He said it for sure is the instument cluster. And he said I have 4:53 gears not 4:11's. So how do I replace this cluster unit and how much it cost? And recalibated my speed odo?

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