01 Vette fuel gauge reading erratic
Thread Starter
1st Gear
Joined: Jun 2022
Posts: 1
Likes: 0
01 Vette fuel gauge reading erratic
Our 01 Vette at time reads low when apparently below about 1/2 full. I hav
e had the computer
er flashed at dealer and it was good for a while. Now
thinking ma
ybe
one of the fuel modules is culprit. Anyone
know of a way to determine which affects the gauge or do I take a chance on one or the other
e had the computer
er flashed at dealer and it was good for a while. Now
thinking ma
ybe
one of the fuel modules is culprit. Anyone
know of a way to determine which affects the gauge or do I take a chance on one or the other
Melting Slicks
Joined: Sep 2008
Posts: 3,139
Likes: 802
From: Espanola New Mexico
By modules you mean the fuel level sending units? The c5 has two tanks the fuel level sending units each send a voltage to the pcm which then sends the appropriate voltage to the fuel gauge. I would try two treatments of Techron complete fuel system cleaner, it should resolve the problem.
Team Owner
Joined: May 2001
Posts: 87,409
Likes: 1,595
From: Western NY
In MANY cases, running a bottle or two of Techron fuel additive through the fuel system, cleans off the built-up oxidation on the fuel gauge contacts, which are within the tank. It's the easiest, cheapest thing to try first.
Race Director
Joined: Oct 2004
Posts: 12,864
Likes: 4,669
TECHRON to the rescue.....most times! It worked for me. The key thing is to not give up on it too soon!! I almost did!! It took me 6 bottles, and driving to Florida from Michigan. Used a couple bottles just before leaving, then every fillup driving to Florida. About the time I hit the Georgia/Florida border, it started reading pretty decent. By the time I reached my destination, it was fine, but it took a few fillups before I really trusted it again. The gauge has worked perfectly ever since. Sometimes it doesn't work for everyone. I do suspect many may try a bottle or two, and give up. I almost did......
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Pro
Joined: Apr 2018
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From: Montgomery City, MO
I've never been a big believer in any kind of liquid additives. But this stuff actually made a difference for me. Best to buy a couple liters and use it all before replacing parts. 1oz per gallon.
I haven't used any in a while. Before running a couple liters through mine, the gauge would never go above 7/8ths.
Now it seems like my passenger side sending unit will read zero (empty) when below 1/2 of a tank. Not a huge problem since that tank will actually be mostly empty after the car's been running for a while. I noticed this when the gauge would go up from just above 1/4 to 1/2 after driving for a while.
Not that it's a fixable problem - the word I've heard is that the sending unit for the passenger side tank has become unobtanium.
I haven't used any in a while. Before running a couple liters through mine, the gauge would never go above 7/8ths.
Now it seems like my passenger side sending unit will read zero (empty) when below 1/2 of a tank. Not a huge problem since that tank will actually be mostly empty after the car's been running for a while. I noticed this when the gauge would go up from just above 1/4 to 1/2 after driving for a while.
Not that it's a fixable problem - the word I've heard is that the sending unit for the passenger side tank has become unobtanium.
Last edited by spfautsch; Jun 15, 2022 at 04:43 PM.