Manual - Chapter 5 - Fuel & Oil

3. Relieving fuel system pressure

  1. Owners should remember that all components of the fuel system from the tank to the fuel rail and injectors contain fuel which is under pressure when the engine is running. 
  2. The pressure will remain for some time after the engine has been switched off and must be relieved before any of these components is disturbed for servicing work.
  3. The first method is simply to exhaust the supply of fuel remaining in the system. Start the engine, remove the right-hand side panel and disconnect the fuel tank wiring connector plug. The pump will then cease to operate and the engine will run only while fuel remains under pressure. Switch off the ignition and re-connect the tank wiring as soon as the engine stops.
  4. The second method can be used if the engine has just been switched off. Disconnect the pressure regulator vacuum hose (usually identified by its protective coil spring) from the rearmost throttle body vacuum stub and suck as hard as possible to open the regulator diaphragm. The pressure will then disperse into the fuel tank. Re-connect the vacuum hose.
  5. Note: with both of these methods fuel will still be present in the system components; it will merely no longer be under pressure. Take all suitable precautions (see Section 2) to prevent the risk of fire or of personal injury when working on any part of the fuel system.