Close
Car Questions
RepairPal is your advocate for car care advice and guidance

Fuel gage not working

(1990 Chevrolet Corvette)
in Paradise, CA on May 06, 2017
Fuel gage only goes to half full, even
when tank is full of gas, on my
1979 Corvette
Displaying 1 answer & 0 comments
Popular Answer
on May 06, 2017
Hello, on a vehicle of that vintage, an analog gauge is utilized. This consists of a float in the fuel tank that varies electrical resistance when the system is powered to direct the fuel gauge where to point to. Maximum resistance is present when the float is all the way at the top with a fuel tank, and as the fuel level drops, the float drops, and resistance drops. In turn, the gauge drops. The circuit could be compromised at the float in the tank, the wiring to the gauge, or within the gauge itself. It's a pretty simple system, but accessing the float is never simple, being submerged in the fuel tank. Basically, the best test is to check if the float is intact, and manually manipulate the float with the ignition "on" to see if the gauge responds in turn. Also, resistance must be measured in the circuit to ensure it is varying. I would recommend enlisting a local shop to help you with this test and repair. Here are some shpos near you that you can check with! Good luck: http://repairpal.com/chevrolet-within-10-miles-of-paradise-california-95969
Sign in to reply
Get a repair estimate
RepairPal estimates are guaranteed at over 2,000 quality certified locations nationwide.
Or interested in getting a repair? Find a Shop

Similar Questions

View answers to similar questions from RepairPal's community of auto experts and enthusiasts.
Has shown numerous malfunctions and the starter will not turn over and gas gage shows empty when full but may start r...
My gurl gage stopped working entirely last week. i also have trouble filling up with petrol as i’m only able to fill ...
Didn't find what you were looking for?