Attention! The power system is under high pressure. Before disconnecting any of the fuel system components, it is recommended to place rags around the connection. Then relieve the pressure by carefully loosening the connection.
1. Disconnect the fuel line (white) 1 from injection line 2 (pic. 3.30). Connect the pressure gauge VAG 1318 using adapter 1318/10 to the fuel line and using adapters 1318/11 and 1318/16 to the injection fuel line.
2. Open the pressure gauge valve (the handle must point in the direction of the arrow).
3. Start the engine and let the engine idle.
4. Measure fuel pressure. It should be about 2-5 bar.
5. Disconnect the fuel pressure regulator vacuum tube 1 from the inlet adapter 2 (pic. 3.31). The fuel pressure should increase to approximately 3.0 bar. Switch off the ignition. Check for leaks and holding pressure by observing the pressure drop on the gauge. After 10 minutes it should be at least 2 bar.
6. If the holding pressure is less than 2 bar: start the engine and let the engine idle.
7. Turn off the ignition after the pressure rises. After a while, close the valve of the manometer (the handle must point in the direction of the arrow) (pic. 3.32).
8. Watch the pressure drop on the pressure gauge.
9. If the pressure does not drop: check the pressure gauge valve.
10. If the pressure drops again: open the pressure gauge valve (handle in the direction of the arrow) (pic. 3.30).
11. Start the engine and leave the engine to idle.
12. Turn off the ignition after the pressure rises. After a while, close the fuel drain line (with blue marking) 3.
13. If the pressure does not drop: apply a fuel pressure regulator.
14. If the pressure drops again, check the fuel line connections, o-rings on the high pressure fuel line and injectors. Check the fuel gauge for fuel leaks.
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