SOLENOID-FUEL PRESSURE
DESCRIPTION
The fuel pressure solenoid is attached to the rear of the left fuel rail. The solenoid controls and maintains the rail pressure constant along with a control current transmitted by the engine control module (ECM) .
The fuel pressure solenoid is attached to the front of the left-bank fuel rail. The fuel solenoid has a hex nut design with a threaded fitting for mounting the valve to the fuel rail. A lipped-edge metal disk is used to seal the solenoid to the fuel rail. An O-ring seals the fuel return side. The seal is not serviceable and its sealing properties will be lost upon removal of the fuel pressure solenoid. Therefore, the fuel pressure solenoid must always be replaced with the fuel rail as an assembly.
WARNING: The fuel pressure solenoid and left fuel rail are serviced as an assembly.
OPERATION
High pressure which is present in the fuel rail flows to the ball seat of the solenoid (5). The specified pressure required by the system is built up in the rail by the fuel pressure solenoid building up a magnetic force which corresponds to this specific pressure by means of a control current from the electronic control module (ECM) . This magnetic force equals a certain outlet cross section at the ball seat of the solenoid. The rail pressure is altered as a result of the quantity of fuel which flows off . The current fuel pressure is signaled by the fuel pressure sensor to the engine control module (ECM). The controlled fuel flows back along the return fuel line, into the tank.
In a de-energized state, the fuel pressure solenoid is closed as the spring force presses the ball into the ball seat . When driving, the fuel pressure solenoid is constantly open . When engine is started, the fuel pressure solenoid is held closed by magnetic force . When driving, the pressure of the fluid counteracts the magnetic force of the coil and the slight spring force.
REMOVAL
WARNING: (Refer To 14 - Fuel System - Warning). No sparks, open flames or smoking. Risk of poisoning from inhaling and swallowing fuel. Risk of injury to eyes and skin from contact with fuel. Pour fuels only into suitable and appropriately marked containers. Wear protective clothing.
NOTE: The fuel pressure solenoid is serviced with the left fuel rail only.
1. Disconnect negative battery cable.
2. Remove engine cover.
3. Remove the left fuel rail (Refer to 14 - FUEL SYSTEM/FUEL INJECTION/FUEL INJECTOR - REMOVAL).
INSTALLATION
WARNING: (Refer to 14 - Fuel System - Warning). No sparks, open flames or smoking. Risk of poisoning from inhaling and swallowing fuel. Risk of injury to eyes and skin from contact with fuel. Pour fuels only into suitable and appropriately marked containers. Wear protective clothing.
NOTE: The fuel pressure solenoid is serviced with the left fuel rail only.