Fuel tank sensor / sending unit replacement
Thread Starter
Racer
Joined: Nov 2005
Posts: 314
Likes: 1
From: West TN
Fuel tank sensor / sending unit replacement
2014 vert with ~ 15k on the odo. The fuel gauge stops working and the check engine light comes on. The small town Chevy dealership is saying the sending unit is bad and they have to drop the transmission to get to the tanks? On top of that, they are nervous about the repair because the mechanics says dropping the tranny can on the C7 can easily damage the firewall? WTF?
Not sure if I should force the issue, find another dealership in a larger metro area with more experience, or call GM customer service.
Not sure if I should force the issue, find another dealership in a larger metro area with more experience, or call GM customer service.
Le Mans Master
Joined: May 1999
Posts: 6,516
Likes: 1,303
From: Windermere FL
One cheap and easy thing to try first is to drop in a bottle of Chevron Tachron concentrate and see if it cleans off the sensors. But if you are under warranty, try a dealer with a more experienced vette service department. Yep, they gotta drop a lot of stuff to get at those senders.
Last edited by Flame Red; May 4, 2017 at 03:15 PM.
Le Mans Master
Joined: Sep 2003
Posts: 8,847
Likes: 795
From: Longview Texas
The deal about damaging the firewall seems irrational at first, but if you drop the transmission and do not correctly support the rest of the drive train, the engine could tilt downward enough to get into the firewall. 
I would try Techron in the gas tank first. If it works then add a bottle every few thousand miles.
I would try Techron in the gas tank first. If it works then add a bottle every few thousand miles.
Last edited by TEXHAWK0; May 5, 2017 at 10:10 AM.
Race Director
Joined: May 2008
Posts: 10,742
Likes: 629
From: Manheim Pennsylvania
Dreaded check engine light illuminates for a variety of reasons, I have not heard about the fuel quantity indicating system setting a code. Post the code/codes, be interesting to see what you got. If you need a major repair, take the car to an experienced shop.
Burning Brakes
Joined: Nov 2016
Posts: 1,190
Likes: 437
From: San Dimas CA
There are six fuel level sensor codes that result in a default gauge reading of empty. I am assuming that "stops working" means it reads empty. Before dropping the tank, I would be absolutely certain that the diagnostic procedures were followed as the problem could be in the wiring, ECM, BCM, or one of the level sensors..
