Fuel Gauge problems
Thread Starter
5th Gear
Joined: Jun 2006
Posts: 5
Likes: 0
Fuel Gauge problems
Hi .I have a 1977 corvette with fuel gauge problems.It wont move past a 1/4 tank on the gauge.I installed a new sending unit ,and have the same results.Ive tried different grounds with no sucsess .THe thing is which i havent seen before ,althought im not a mechanic is when i unhook the power wire form the sending unit the fuel gauge goes to full.it must be telling me something but im not sure what that is.Would appreciate any help form the forum teck or anyone who has had the same problem
Thanks
PjKing
Thanks
PjKing
Thread Starter
5th Gear
Joined: Jun 2006
Posts: 5
Likes: 0
Ive tried that and makes no difference.The only time anything makes a difference is when i remove t he power wire ,then the gauge goes to the full position.Sorry do you mean the hot wire or the ground wire.Thanks
Last edited by pjking; Aug 13, 2008 at 04:25 PM.
Drifting
Joined: Jul 2003
Posts: 1,253
Likes: 1
From: East China MI
If you have adobe, PM me with your email address and I'll send you a troubleshooting guide.
I would look for two things: 1. A bad ground on the tank. You could check this by grounding the tank with a wire and a couple of aligator clips. 2. A short in the sender wire. Take a long piece of wire and run it from the tank to the gauge and see if you get a different reading.
I would look for two things: 1. A bad ground on the tank. You could check this by grounding the tank with a wire and a couple of aligator clips. 2. A short in the sender wire. Take a long piece of wire and run it from the tank to the gauge and see if you get a different reading.
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Instructor
Joined: Oct 2006
Posts: 219
Likes: 0
From: Jupiter FL
If your gas tank has a bladder, which I'm not certain if your year does or not, I have seen more times that I can count that the bladder pulls away from the side of the tank a bit, (bulges out), and the float can't get by it. If that's the case you can gently bend out the float rod a bit so it will clear, and then you'll be back in business.
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
When you say power wire do you mean the tan wire at the tank?If so removing the tan wire from the sending unit with the key ON should make the gauge go to full.Grounding the tan wire to the fuel tank should make the gauge go to empty. Is this what yours does?
2nd Gear
Joined: Nov 2008
Posts: 2
Likes: 0
I will need to clean the wire to see the color of it, but it is the wire with the round grommet on the end that plugs on to the pin connector. I will have to ground this wire to the tank to see if it goes to empty. After putting the new sending unit in I put around 8 gallons of gas in the tank and the gauge still does not register. There is no blatter in this tank. Thanks for the help.
Pro
Joined: Mar 2005
Posts: 683
Likes: 4
If your gas tank has a bladder, which I'm not certain if your year does or not, I have seen more times that I can count that the bladder pulls away from the side of the tank a bit, (bulges out), and the float can't get by it. If that's the case you can gently bend out the float rod a bit so it will clear, and then you'll be back in business.
Let us know what happens.
Good Luck
Steve
