Circuit Description

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The fuel tank is equipped with 2 fuel level sensors, one in each reservoir of the fuel tank. The engine control module (ECM) uses inputs from the fuel level sensors in order to calculate the total fuel remaining in both sides of the fuel tank. Fuel is transferred from the left side of the tank to the right side of the fuel tank in order to ensure all of the usable fuel volume is available. The fuel pump supplies a small amount of pressurized fuel to the siphon jet pump through the fuel feed pipe. The pressurized fuel creates a venturi action inside the siphon jet pump causing fuel to be drawn out of the left side of the fuel tank. Fuel is then transferred through the internal transfer tube to the right side of the fuel tank. The fuel level in the fuel tank will equalize during fuel pump operation, during re-fueling and when the fuel level is more than 50 percent. If the ECM detects a lack of expected signal variation from the fuel sensors during normal operation, DTC P2636 sets.