Depressurizing Fuel System
WARNING:
Under normal operating conditions fuel injection system is pressurized by a high pressure fuel pump, operating at up to 34-37 psi (2.3-2.5 bar). When engine is stationary this pressure is maintained within system. To prevent pressurized fuel escaping and to avoid personal injury, it is necessary to depressurize fuel injection system before any service operations are carried out.
WARNING:
The spilling of fuel is unavoidable during this operation. Ensure all necessary precautions are taken to prevent fire and explosion.
NOTE:
If vehicle has not been run there will still be a small amount of residual pressure in fuel line. Depressurizing procedure must still be carried out before disconnecting components within fuel system.
- Pull fuel pump relay off its connector. See FUEL PUMP & MAIN RELAYS under RELAYS & SOLENOIDS. Start and run engine.
- When sufficient fuel has been used up causing fuel line pressure to drop, injectors will become inoperative, resulting in engine stall. Switch ignition off. Disconnect battery negative terminal.
- Fuel at low pressure will remain in system. To remove this low pressure fuel, place an absorbent cloth around fuel feed hose at fuel rail and disconnect either nut and ferrule at fuel rail or hose at inlet end of fuel filter.
- After completing fuel system repair, reconnect disconnected fuel line. Install fuel pump relay and reconnect battery. Crank engine. Engine will fire within approximately 6-8 seconds.