This changes the resistance of the tank unit, changing the amount of current at the gauge unit coils, which in turn moves the needle located between the coils.īeginning around 1950, some vehicles have a small voltage regulator behind the dash that supplies a stable voltage supply for the instruments – something less than the battery voltage of six (or 12) volts. The variations in the amount of fuel in the tank cause the arm to move. The movement of the float arm is controlled by the amount of fuel in the gas tank. The opposite end of brush unit is attached to the float arm located inside of the gas tank. The tank sender unit is mounted to the outside of the gas tank (with a float on the inside, of course) and is made up of a metal housing that contains a rheostat (which is simply a resistance unit), and a brush that comes in contact with the resistance unit. A dampener is also located on the armature to prevent excessive needle movement on rough roads. The gas gauge, often located in the instrument cluster, consists of two small coils spaced 90 degrees apart with an armature and a needle placed at the intersection of the two coils.
Chevy volt range on a tank of gas manual#
Your service manual will give you any added instructions necessary for your specific type of fuel gauge. The following trouble-shooting instructions apply to the AC-type fuel gauge, which is one of the most common type of units. Most gas tank units consist of two parts, the gas gauge mounted in the dash and a tank sender mounted in the tank. Sending Unit Float (only if not replacing the full unit) Troubleshooting Your Chevy Truck Gas Gauge Failure
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