Gas guage
Thread Starter
Race Director
Joined: Jan 2007
Posts: 10,682
Likes: 696
From: Danville Illinois
2025 Corvette of the Year Finalist - Modified
2024 C3 of the Year Winner - Modified
2021 C3 of the Year Finalist - Modified
2019 C3 of Year Finalist (appearance mods)
Gas guage
Put in a heater core last month in my 75 and no problems everything was working including the gas gauge.
Pulled the car out to do some stuff in the garage and the gas gauge is pegged at 3:00, way past the full mark.
Any trouble shooting diagnostics to check it out?
Pulled the car out to do some stuff in the garage and the gas gauge is pegged at 3:00, way past the full mark.
Any trouble shooting diagnostics to check it out?
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,853
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
And here is how to find the issue.
Corvette Fuel Gauge and Sending Unit Testing 1968-1976
Last edited by Willcox Corvette; Sep 13, 2014 at 09:47 PM.
Thread Starter
Race Director
Joined: Jan 2007
Posts: 10,682
Likes: 696
From: Danville Illinois
2025 Corvette of the Year Finalist - Modified
2024 C3 of the Year Winner - Modified
2021 C3 of the Year Finalist - Modified
2019 C3 of Year Finalist (appearance mods)
Thank you, again, and again, for your help. Especially for the video with the diagnostics explained... Don't get much easier than that..
Will check it out if tomorrow.
Thank you, again
Will check it out if tomorrow.
Thank you, again
Thread Starter
Race Director
Joined: Jan 2007
Posts: 10,682
Likes: 696
From: Danville Illinois
2025 Corvette of the Year Finalist - Modified
2024 C3 of the Year Winner - Modified
2021 C3 of the Year Finalist - Modified
2019 C3 of Year Finalist (appearance mods)
When i got into the car the gauge was reading correctly? I did take out the panel to check everything and looks ok, wires/contacts et, even took it for a test drive to see if it would act up again, jiggled the wires and turned everything on etc and looks like ( all is well, for now ).
Not sure what caused it to act up tho. Will keep an eye on it in the future.
Thank you for the video and info from you web site.
Not sure what caused it to act up tho. Will keep an eye on it in the future.
Thank you for the video and info from you web site.
Thread Starter
Race Director
Joined: Jan 2007
Posts: 10,682
Likes: 696
From: Danville Illinois
2025 Corvette of the Year Finalist - Modified
2024 C3 of the Year Winner - Modified
2021 C3 of the Year Finalist - Modified
2019 C3 of Year Finalist (appearance mods)
Again, i get in the car and its working correctly, drive for 10 minuets and all is well, look at the gauge again and its pegged at 3:00.
Think i will trace out the tan wire to its source after i look in the aim and see if it has a problem.
Later
Think i will trace out the tan wire to its source after i look in the aim and see if it has a problem.
Later
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,853
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
For the gauge to go to 3, you are dropping ohms. When this happens and when you have the 3 reading, go to the sender and pull an ohms reading from the sender.
If the sender is failing or you have a sender ground issue you'll get 1 on your meter (open circuit). Check the ground at this point by running another ground to the sender and testing again. If you still get open circuit you might want to take a hard look at the sender.
If you get ohms reading you have verified the sender and ground as not being the issue. I’d then take a look at the ohms wire connector where it attaches to the sender and make sure it’s not corroded or loose. I would also inspect the wire in the area of the sender.
Because dropping ohms from the gauge can be so many different issues... It’s best to start at the back and work forward. It could be something as simple as corrosion in the front to rear connector or a loose or damaged wire from front to rear, all the way to a defective sending unit.
Willcox
Burning Brakes
Joined: May 2014
Posts: 1,094
Likes: 16
From: Los Angeles California
My car was doing that after I figured gauge was right I dropped tank (not all the way down just enough to get my hands on wires) to see if wires on sending unit were on correctly so I took em off and put em back on and nothing then I traced the wires going down the side and saw some wires were hitting muffler they were a little crispy so I taped them up and moved to the side wiggled the signal wire on sending unit and my tank went to 1/4 which is basically what I thought I had.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Race Director
Joined: Jan 2007
Posts: 10,682
Likes: 696
From: Danville Illinois
2025 Corvette of the Year Finalist - Modified
2024 C3 of the Year Winner - Modified
2021 C3 of the Year Finalist - Modified
2019 C3 of Year Finalist (appearance mods)
Thank you Willcox for the videos and web site pdfs.
The problem was that a month ago i replaced the gas tank drain hose bye the gas filler, in reinstalling the rubber boot i knocked the tan wire loose from the sender, it was just sitting on the tanks connector, that's why it would be intermittent.
While doing your check list i discovered it, thank you again.
P/S. you wouldn't happen to have a clock video for my 75, clock has been at 12:00 for close to 30 years now?
The problem was that a month ago i replaced the gas tank drain hose bye the gas filler, in reinstalling the rubber boot i knocked the tan wire loose from the sender, it was just sitting on the tanks connector, that's why it would be intermittent.
While doing your check list i discovered it, thank you again.
P/S. you wouldn't happen to have a clock video for my 75, clock has been at 12:00 for close to 30 years now?
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,853
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
Thank you Willcox for the videos and web site pdfs.
The problem was that a month ago i replaced the gas tank drain hose bye the gas filler, in reinstalling the rubber boot i knocked the tan wire loose from the sender, it was just sitting on the tanks connector, that's why it would be intermittent.
While doing your check list i discovered it, thank you again.
P/S. you wouldn't happen to have a clock video for my 75, clock has been at 12:00 for close to 30 years now?
The problem was that a month ago i replaced the gas tank drain hose bye the gas filler, in reinstalling the rubber boot i knocked the tan wire loose from the sender, it was just sitting on the tanks connector, that's why it would be intermittent.
While doing your check list i discovered it, thank you again.
P/S. you wouldn't happen to have a clock video for my 75, clock has been at 12:00 for close to 30 years now?
I can fix the original movements but it would just be a band-aide. The original borg movements were not a great design and as you know it failed early in life and will probably fail again if repaired. The best solution is to quartz convert the clock.
Willcox