gas gauge failure
Melting Slicks
Joined: Jul 2006
Posts: 2,332
Likes: 31
From: Silver Spring MD
Techron or Seafoam
Have used both, one at a time, Both of these chemical solutions will dissolve some of the sulfur oxidation on the sending units. Since you have 2 of them, one in each tank it is best to add when tanks are about half full and them full up the tanks to the top. A continuing problem with the C5.
2nd Gear
Joined: Mar 2019
Posts: 2
Likes: 0
I can relate in a way. My 2004 C5 convertible suddenly started dropping to empty after fill-ups. Ran a bottle of Techron through a partial tank and it started working after it reached just below half tank after a fill-up. Ran down to below 1/8 tank and put in another 20 ounces of Techron then filled up. Same result. However, I notice whenever I hit a bump the gauge works for about 15-20 seconds then crashes to empty again. I also started running nothing but Shell 93 V-power. I resorted to resetting my trip odometer with each fill-up and watching the miles. Since it still starts working below 1/2 tank, I guess I will just live with it. I called a local Chevy service center and was quoted “around $2,000” to replace it. Hoping it resolves with time, but will trust my trip odometer if not. 👍
Bill
Bill
Le Mans Master
Joined: Sep 2013
Posts: 8,900
Likes: 1,074
From: Wisconsin
I can relate in a way. My 2004 C5 convertible suddenly started dropping to empty after fill-ups. Ran a bottle of Techron through a partial tank and it started working after it reached just below half tank after a fill-up. Ran down to below 1/8 tank and put in another 20 ounces of Techron then filled up. Same result. However, I notice whenever I hit a bump the gauge works for about 15-20 seconds then crashes to empty again. I also started running nothing but Shell 93 V-power. I resorted to resetting my trip odometer with each fill-up and watching the miles. Since it still starts working below 1/2 tank, I guess I will just live with it. I called a local Chevy service center and was quoted “around $2,000” to replace it. Hoping it resolves with time, but will trust my trip odometer if not. 👍
Bill
Bill
2nd Gear
Joined: Mar 2019
Posts: 2
Likes: 0
Bill
Le Mans Master
Joined: Sep 2013
Posts: 8,900
Likes: 1,074
From: Wisconsin
Thanks for the feedback. I thought about that too, but once it falls to just under 1/2 tank the gauge works normally regardless of hitting bumps or not. I also recently lost all power to my driver door. Fuses and DCMs are good. Passenger side works fine. Going to check the connection inside the door to body boot this weekend. I’m guessing that’s where that problem lies. Small quirks to owning a Vette, but well worth it!
Bill
Bill
Racer
Joined: Mar 2018
Posts: 456
Likes: 144
From: Frederick Colorado
Mine has been doing that off and on for a couple of years. I’ve tried different approaches with Techron and it doesn’t seem to do anything for me but I have read too many posts saying it works to Not keep trying. It hasn’t failed completely so I will just live with it.....
