Fuel Level Gauge

The fuel level gauge circuit reads the fuel level in the gas tank through the use of a fuel tank sending unit which is mounted on the top surface of the fuel tank. The fuel tank sending unit consists of a float that rides on the surface of the fuel in the tank and a variable resistor controlled by the float arm. When electric power is supplied to the fuel gauge, current flows through the gauge to the variable resistor and then to ground. The position of the display is determined by the strength of the current flowing through the gauge. The maximum display range of the pointer is 93 degrees and has a display tolerance of 4.4 degrees.

As the fuel level decreases the sending unit resistance increases, and when the fuel level increases the sending unit resistance decreases. The display of the correct fuel level is dampened slightly upon start-up (cycling of ignition) and will stabilize after approximately 12 seconds. The sensor resistance range is from 283.00 ohms at 0 liters (tank empty) to 38.00 ohms at 62 liters (tank full).