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Thread: re-calibrating the fuel level sensor {F0101}

  1. #1
    Lifetime Member LB72004's Avatar
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    Default re-calibrating the fuel level sensor {F0101}

    for anyone wanting to re-calibrate the fuel level sensor on the 26 gal tanks these are the numbers that that i came up with:
    Gallons Voltage

    0 gal 0.686275
    1 gal 0.764706
    2 gal 0.901961
    3 gal 1.019608
    4 gal 1.137255
    5 gal 1.254902
    6 gal 1.352941
    7 gal 1.450980
    8 gal 1.509804
    9 gal 1.588235
    10 gal 1.686275
    11 gal 1.764706
    12 gal 1.803922
    13 gal 1.882353
    14 gal 1.941176
    15 gal 2.019608
    16 gal 2.078431
    17 gal 2.156863
    18 gal 2.215686
    19 gal 2.274510
    20 gal 2.313725
    21 gal 2.397205
    22 gal 2.470588
    23 gal 2.529412
    24 gal 2.529412
    25 gal 2.529412
    26 gal 2.529412
    27 gal 2.529412

    i did this by removing my bed, pulling the pickup unit and sucking the remaining fuel out till dry. i then reassembled everything and while running the scan tool and monitoring fuel level sensor voltage i added one gallon of fuel at a time and took note of the voltage.

    i then entered the data into my tune and crossed my fingers. well it tracks nicely, almost exactly nuts on in relation to the odometer.

    this is what my {F0101} table looks like now (photo). i did not try to smooth the cells as the ECM/BCM does this already to the the gauge. the gauge still sits on full for the first couple of gallons as the sensor maxes out but there is still room for more.

    i have also attached a text file with all the figures for anyone who wants to copy & paste them into their tune
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    2008 Chevrolet 3500HD DRW LTZ
    285/75/17 Nitto Dura Grapplers, 4.56 gears, Front and rear ARB lockers, Efi Live tuning by me, Raptor 160 LP, Cognito 4-6 NTB Lift, 4" Exhaust, Built Trans by Mike L.

    Sold - 2004 LB7 Duramax, EFI Live with DSP5 Tune
    stage 4 SC transmission, 265/70/16 tires

  2. #2
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    Default re-calibrating the fuel level sensor {F0101}

    Thanks!
    14 GMC Sierra
    5.3L CC SB 4x4
    Basic tuning....

  3. #3
    Lifetime Member Boost's Avatar
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    Thanks for the great work, much appreciated!
    '12 Caprice PPV 6.0 L77 - daily transportation
    8.7 @ 84 (1/8 mile) bolt-ons

    '02 Silverado RCSB 5.3 L59 - regularly street driven
    8.2 @ 86 (1/8 mile) stock cam and spray
    8.6 @ 84 (1/8 mile) cam and heads no spray

    Our YOUTUBE CHANNEL featuring the Silverado

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    im going to try this thanks a lot.

  5. #5
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    thank you very much!!
    LB7 2001, EfiLive DSP5 , AirDog II, Afe intake , Summit 4"exhaust

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    I just tried to use your values in my EFILive for my 08 LMM and I'm showing a table of volts and allows me to enter the value (in gallons) of fuel for that voltage (ends up backwards from your table) what version of EFI Live did you use to create this table?

  7. #7
    Lifetime Member LB72004's Avatar
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    version is irrelevant for this. the problem is that in the later years, LBZ??? they used a different fuel level sensor that reads backwards and the scale is changed too. the figures i gathered would only work on the LB7 and LLY fuel level sensors.

    you could swap out the pickup/sensor and use the figures but at that time you may as well log your own by then

    is yours a 26 gal or 34 gal tank? i am planing on rescaling my 08 LMM 34 gal tank here shortly so the fuel light doesn't come on with 19 gallons left in the tank
    2008 Chevrolet 3500HD DRW LTZ
    285/75/17 Nitto Dura Grapplers, 4.56 gears, Front and rear ARB lockers, Efi Live tuning by me, Raptor 160 LP, Cognito 4-6 NTB Lift, 4" Exhaust, Built Trans by Mike L.

    Sold - 2004 LB7 Duramax, EFI Live with DSP5 Tune
    stage 4 SC transmission, 265/70/16 tires

  8. #8
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    Didn't even realize you had an LB7 in your signature as well, saw the 08 and got very excited

    I only have a 26 gal tank. I have thought about re-scaling from empty (not quite as far as you went) but reading at ~20gal used and adding a gallon and making the reads from there and matching as closely as I can. My gauge reads empty at about 12-13 gallons used.

    Thanks for the reply.

    Quote Originally Posted by LB72004 View Post
    version is irrelevant for this. the problem is that in the later years, LBZ??? they used a different fuel level sensor that reads backwards and the scale is changed too. the figures i gathered would only work on the LB7 and LLY fuel level sensors.

    you could swap out the pickup/sensor and use the figures but at that time you may as well log your own by then

    is yours a 26 gal or 34 gal tank? i am planing on rescaling my 08 LMM 34 gal tank here shortly so the fuel light doesn't come on with 19 gallons left in the tank

  9. #9
    Lifetime Member LB72004's Avatar
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    2008 Chevrolet 3500HD DRW LTZ
    285/75/17 Nitto Dura Grapplers, 4.56 gears, Front and rear ARB lockers, Efi Live tuning by me, Raptor 160 LP, Cognito 4-6 NTB Lift, 4" Exhaust, Built Trans by Mike L.

    Sold - 2004 LB7 Duramax, EFI Live with DSP5 Tune
    stage 4 SC transmission, 265/70/16 tires

  10. #10
    Lifetime Member DURAtotheMAX's Avatar
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    Quote Originally Posted by LB72004 View Post
    version is irrelevant for this. the problem is that in the later years, LBZ??? they used a different fuel level sensor that reads backwards and the scale is changed too. the figures i gathered would only work on the LB7 and LLY fuel level sensors.

    you could swap out the pickup/sensor and use the figures but at that time you may as well log your own by then

    is yours a 26 gal or 34 gal tank? i am planing on rescaling my 08 LMM 34 gal tank here shortly so the fuel light doesn't come on with 19 gallons left in the tank
    Actually it was 2004.5 when they changed fuel level sensors.

    2001-2004 LB7 is the one that reads backwards. 2004.5-2015+ reads "proper".

    Ben
    2005 Silverado, CC/SB, 4x4, LT, LILLY/Allison
    12.9s @ 108 mph

    many thanks to Ross and Paul

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