Dual Tank (8.1L)

The fuel balance pump module monitors the signal circuit of the fuel level sensors in order to determine the fuel level. When the fuel tanks are full, the fuel level sensors resistance is high. When the fuel tanks are empty the fuel level sensors resistance is low. The fuel balance pump module averages the resistance of the primary and the secondary fuel level sensors in order to produce an equal resistance value that reflects the average level of both tanks. The fuel balance pump module equalizes the fuel levels in both tanks while supplying fuel to the engine from the primary tank.

The PCM monitors the fuel level signal from the fuel balance pump module in order to determine the fuel level. The PCM calculates the total amount of remaining fuel based on the information from the fuel balance pump module. The IPC receives the total amount of fuel remaining information from the PCM via the fuel level sensor signal circuit. The fuel level sensor changes resistance (40-250 ohms) based on the fuel level.