Decompression of the fuel system (Opel Astra G)

Attention! When decompressing the fuel system, observe fire safety regulations.

1. The fuel system is under pressure both when the engine is running and when the ignition is on. After the ignition is turned off, the pressure in the system may remain for some time and if it is necessary to remove any unit, the residual pressure should be released.

Single shaft engines

2. Turn off the ignition. Remove the cover of the mounting block located next to the left suspension cap and remove the fuel pump relay (magenta relay).



3. Start the engine, when the engine starts to run intermittently, stop it.

4. Disconnect the battery from ground.

Twin shaft engines

5. On these engines, decompression is accomplished either by removing the fuel pump relay and running off the remaining gasoline (see above), or through a drain valve that is mounted on the fuel distributor (see photo).





6. The drain valve is mounted either on the right side of the fuel distributor (1.4 and 1.6 l), or in its upper part (1.8 and 2.0 l). Remove the cap from the valve, place a container underneath, cover the valve with a rag and press the valve stem with a screwdriver. After the fuel has flowed out, close the valve with the cap.