Fuel Guage Sticking
Thread Starter
Racer
Joined: Feb 2009
Posts: 265
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Fuel Guage Sticking
Just when I'm about done fixing everything............
The gas guage has started acting up. When I fill the tank, the guage seems to sit at about 1/4 full. When I get to 1/2 to 3/4 tank, the guage seems to read accurately down to empty. Sound like the sending unit in the tank or the guage? What to check? Thanks.
The gas guage has started acting up. When I fill the tank, the guage seems to sit at about 1/4 full. When I get to 1/2 to 3/4 tank, the guage seems to read accurately down to empty. Sound like the sending unit in the tank or the guage? What to check? Thanks.
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
Knuckle,
From your other post, I'll assume this is a 1971. I think first I would test the output of the sending unit when it is stuck on ¼ tank. This will tell you if the problem is the sending unit or if it is somewhere else.
It is quite possible the potentiometer in the tank sender is acting up and highly probable.
The only other thing that would cause a gauge to read around ¼ when full is the resistor on the back of the gauge. If this were the case the ¼ reading would be the highest reading the gauge would put out and it would read lower as the tank level descended.
You could have a lose or corroded wire at the tank causing resistance in the wire from time to time, but I think you might be in need of a sending unit or repair.
Willcox
From your other post, I'll assume this is a 1971. I think first I would test the output of the sending unit when it is stuck on ¼ tank. This will tell you if the problem is the sending unit or if it is somewhere else.
It is quite possible the potentiometer in the tank sender is acting up and highly probable.
The only other thing that would cause a gauge to read around ¼ when full is the resistor on the back of the gauge. If this were the case the ¼ reading would be the highest reading the gauge would put out and it would read lower as the tank level descended.
You could have a lose or corroded wire at the tank causing resistance in the wire from time to time, but I think you might be in need of a sending unit or repair.
Willcox
Thread Starter
Racer
Joined: Feb 2009
Posts: 265
Likes: 0
You could have a lose or corroded wire at the tank causing resistance in the wire from time to time, but I think you might be in need of a sending unit or repair.
Willcox[/QUOTE]
Sorry, yeah it is a '71. I can check for corrosion at the connections, but can you tell me how to test the output of the sending unit? Thanks.
Willcox[/QUOTE]
Sorry, yeah it is a '71. I can check for corrosion at the connections, but can you tell me how to test the output of the sending unit? Thanks.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
The sending unit has a break [or short...I'm not sure which] in the rheostat at the 1/4 tank mark. It just reads that value until the tank level goes lower. Your problem is the sending unit.
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
7t1 is correct. This page will tell you exactly how to test the sending unit. It's toward the end of the sheets but it will show you in detail. http://willcoxcorvette.com/repairand...lp.php?hID=276
Willcox
Willcox
