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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Jan 2009 Posts: 24 'Bolter | | 'Bolter Joined: Jan 2009 Posts: 24 | When the ignition is on, gas gauge pins to full (even when tank has only 5 gallons in it), When I switch the ignition off, the needle drops. What gives? Sending unit? Help... | | | | | Joined: Apr 2005 Posts: 7,440 Bolter | | Bolter Joined: Apr 2005 Posts: 7,440 | Try doing a Stovebolt search using the search function in the bar just above your post. Thousands of posts about Gas Gauges. Your answer will be there. Someone will be along soon to save you the trouble.
Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne (Emily)
‘39 Dodge Business Coupe (Clarence)
“I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!
USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)
| | | | | Joined: Jun 2005 Posts: 1,002 'Bolter | | 'Bolter Joined: Jun 2005 Posts: 1,002 | Better for you to do the search, as Martin suggested. I've learned many things about issues other than what I was searching for while doing so; and found solutions to my issue.
But to give you a head start, you have two posts on the back of your gauge, One is 12v with the key on and the other goes to the sending unit on your fuel tank. As your float on your sending unit goes up and down, it increases/decreases the resistance-----which causes the needle on your gauge to move.
Read through the threads will help you diagnose your problem. It could be a number of things: your float is full of fuel, your fuel tank is not grounded, your fuel sending unit needs to be replaced, etc.
Do your search, learn many things that will help you in the future to keep your C10 on the road, and if you run into a problem, let us know. Good luck!
~ Victor 1941 3/4-Ton Pickup (in process). Read about it in the DITY Gallery1955 Grumman Kurbside "Doughboy" 235/3 on tree w/ OD 1957 3100 - moved on 1959 C4500 Short Bus "Magic Bus" - moved on 1959 G3800 1 Ton Dually "Chief" - moved on 1958 C4400 Viking "Thor" ~ moved on to fellow Bolter | | | | | Joined: Dec 2002 Posts: 3,441 Moderator - The Electrical Bay | | Moderator - The Electrical Bay Joined: Dec 2002 Posts: 3,441 | What VEW and Horse said. While there are many folks who will give you an answer, there is usually something else going on as well. Please do ask the questions though.
Another quality post.
Real Trucks Rattle
HELP! The Paranoids are after me!
| | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | Try this (it is easy and will not hurt anything): Run a wire from the frame (or, from a ground-strap connector) to a mounting post of the sender on the gas tank. This needs to be grounded. If it is not grounded, the gauge will read "full". Here are better instructions/explanations. | | |
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