Fuel Control Solenoid
The fuel quantity solenoid mounts to front of the high pressure pump and is controlled by the ECM. The solenoid assists in maintaining proper fuel quantity in all three of the pumping elements, inside the high pressure pump, under all operating conditions. Fuel tank heat protection is also provided by the fuel quantity solenoid. The solenoid meters the exact amount of fuel to prevent excess heated fuel from returning to the tank. See Fig 1.