Results 1 to 3 of 3

Thread: LLY Duramaxl fuel gauge scale

  1. #1
    New Member
    Join Date
    Apr 2020

    Default LLY Duramaxl fuel gauge scale

    Hello everyone, I'm new to the EFI Live family. I have an 03 Silverado Duramax 4x4 with an 05 LLY Duramax engine and trans installed. When I installed the engine and trans, I had to have the fuel gauge re-scaled because it was reading backwards. I recently had to replace the ECU. So again, my fuel gauge reads backwards. I've purchased EFI Live to fix this problem and put some tunes on the truck. I've looked through the forum for help, but have been unsuccessful. Can someone help me with this? Right now, my truck is full of fuel, the gauge reads empty and the fuel light is on. Just trying to get it fixed. Thank you.

  2. #2
    Lifetime Member killerbee's Avatar
    Join Date
    Jan 2006


    The best way to recalibrate your gauge:

    1. Run your truck out of fuel. Keep a container of diesel in the bed for when this happens.
    2. Head to service station with your log tool, parking your truck on a level surface.
    3. Beginning with zero fuel, write down your fuel level voltage that coincides with the pump reading in gallons. I would pump a gallon, record the voltage reading.
    4. Repeat step 3 for every gallon until your tank is full.
    5. Now you have the data for your new voltage scaling table.
    Michael, Systems Engineer 04.5 D-max LLY, Phoenix, Arizona Email
    Custom Tuning Services
    DURAMAX/CUMMINS ECM's TCM's for sale, all years, 20% wholesale discount available
    EFILive's first VGT "Software Wastegate Tune"

  3. #3
    Lifetime Member IdahoRob's Avatar
    Join Date
    Apr 2006


    Just find an LLY tune and copy the fuel tank settings and paste into your LB7 tune and save. You may have to scale it to fit the parameters as i don't remember off the top of my head. I would not go through what the above poster said unless you have a LOT of time on your hands.
    2013 LML, 550hp with factory emissions, stock cp4 and compound turbos.
    2002 LBZ, 4x4 (Max'd Out) 6000lbs 9.36 @ 154 mph NHRDA Champion and Record holder
    1965 El Camino, duramax 9.6 @ 149MPH

    All EFI tuned by Adrenaline Truck Performance

Similar Threads

  1. 07 fuel gauge accuracy
    By BoomBam in forum Cummins 5.9L
    Replies: 3
    Last Post: May 31st, 2017, 02:36 PM
  2. calibration of fuel gauge
    By mah2092 in forum Duramax LLY
    Replies: 2
    Last Post: January 8th, 2012, 05:21 PM
  3. Fuel MAP RPM scale problem even with new build 170
    By Black6spdZ in forum Duramax 06 LLY / 06+ LBZ & LMM
    Replies: 2
    Last Post: July 7th, 2011, 12:18 PM
  4. 06 LLY Fuel Gauge - empty gauge with 7 gallons left
    By timvan in forum Duramax 06 LLY / 06+ LBZ & LMM
    Replies: 1
    Last Post: December 5th, 2009, 02:35 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts