Fuel Level Sender

The fuel level sender is mounted to the fuel pump assembly. As the fuel level changes, the float rises or falls with the fuel level moving the sweep arm across the resistor wires. This movement either increases or decreases the resistance through the unit. The fuel level sensor resistance ranges between 464 ohms ± 4 ohms at empty (E) and 51 ohms ± 2 ohms at full (F). When the fuel level is low, the fuel level sensor resistance is high. When the fuel level is high, the fuel level resistance is low.

The fuel pump assembly is hardwired to the BCM through separate signal and return circuits. The fuel level return circuits are grounded internally in the BCM. The BCM provides a reference voltage on the fuel level signal circuit. As the fuel level changes, the change in resistance raises or lowers the fuel level signal voltage depending on the resistance of the fuel level sender.