Crazy fuel guage readings - Chevy and GMC Duramax Diesel Forum
2011-2016 (Non Powertrain) Discussion of 2011-2016 topics not related to powertrain

LinkBack Thread Tools Display Modes
post #1 of 2 (permalink) Old 06-27-2019, 03:38 PM Thread Starter
Junior Member
BandJCarm's Avatar
Join Date: Mar 2014
Location: Conway, AR
Posts: 66
Crazy fuel guage readings

2016 LML. About every 10 times, when I start the vehicle, the fuel gauge will show empty.....and "Low Fuel" light comes on. If I sit for up to 10 minutes, or longer, the fuel gauge slowly climbs back to where it is accurate.

I have a Trax3 37 gallon automatic-filling auxiliary fuel tank in the bed. It automatically fills main tank, and has its own gauge. During these times, it flits back and forth between normal, and "SNDR MSO" message, and shows the same 0 percent in Main tank. Then sometimes, the Trax3 guage shows correct main tank readings even while the vehicle DIC shows empty.

It never stays will revert slowly back to normal after a while.


2016 GMC Denali 3500 Dually
BandJCarm is offline  
Sponsored Links
post #2 of 2 (permalink) Old 06-27-2019, 10:25 PM
DuramaxForum Fanatic
D_R_C's Avatar
Join Date: May 2007
Location: Rocky Top, USA
Posts: 6,825
Ya, eliminate your auto fill if you can, that IMO is your problem, install a toggle switch if itís electric or a electric normally closed solenoid on a switch if itís gravity so you can control the transfer, forget about the auto fill luxury.
This confuses the computer part that monitors the fuel level.

I have electric fuel pump and electric normally closed solenoid wired on the same switch for double protection with hopes that fuel wonít flow with out my control, in case one fails.
This works pretty flawless when you start fueling slowly using 3/8Ē fuel line hose, then shut off the fuel transfer when the fuel gauge gets to about 3/4 tank, the gauge will continue to rising slowly close to full after the flow is shut off.

If you allow the fuel level get to high when transferring, you could also have the issue your having.

2007.5 GMC Sierra 3500 SRW L.B."BLACK" C.C. 4X4 LMM Z71
DIY stock airbox mod, aFe ProGuard 7, OEM drop-in
EFILive ECM ATP - Heavy Tow Tune with Turbo Brake.
EFILive TCM Duramax Tuner
DHD Cold Side High Flow Intake Pipe
DHD PCV Re-Route
AirDog 4G100

2007 Yukon Denail "BLACK" 6.2 gasser
DIY stock AirBox Mod, K&N, Airaid intake, EFILive TCM only tuning
D_R_C is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Chevy and GMC Duramax Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome