Fuel Gauge: Description and Operation

Fuel Level Indication System
The fuel level indication system is a magnetic gauge system. It consists of a magnetic fuel gauge mounted in the instrument cluster and a sending unit located in the fuel tank with an instrument cluster gauge amplifier in series between the two. No instrument voltage regulator is used with this system.

Fuel Gauge
The magnetic gauge movement consists of three primary coils, one of which is wound at a 90-degree angle to the other two. The coils form a magnetic field which varies in direction according to the variable resistance of the sender unit which is connected between two of them. A primary magnet, to which a shaft and pointer are attached, rotates to align to this primary field, resulting in pointer position. The bobbin/coil assembly is pressed into a metal housing which has two holes for dial mounting. There is no adjustment, calibration or maintenance required for these gauges. The instrument cluster amplifier is calibrated to the fuel gauge. The instrument cluster amplifier and fuel gauge must be replaced as a system.