Relieving pressure in the fuel system of gasoline engines (Opel Corsa C)

1. When the engine is running, high pressure is created inside the fuel system for the normal functioning of the fuel injection system. After the engine is stopped, this pressure remains in the system for a long time. To prevent fuel from splashing when opening the fuel system, which can lead to the most unpredictable consequences, it is necessary to release the fuel pressure.

Caution: The fuel system must be depressurized before servicing any of its components to minimize the risk of fuel ignition and personal injury!

2. Remove the protective cap (see accompanying illustration) service nipple (to check the operating pressure in the fuel supply system).



3. Install a fuel system pressure tester/relief device (KM-J-34730-91) (see accompanying illustration) and lower the drain hose into a suitable container prepared in advance. Open the drain cock and release the fuel pressure, some fuel will drain into the container.





4. When the operation is complete, disconnect the device and screw on the protective cap.

5. If you don't have a special device, you can do the following: make sure that the ignition is off, remove the cover of the relay mounting block (see Chapter 12) and remove the fuel pump relay from its socket.

6. Start the engine, wait until it stops on its own, then crank the starter for another 5 seconds to be absolutely sure that the pressure in the fuel lines has been released. Turn off the ignition and insert the fuel pump relay back into place.

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