- Unscrew the 4 screws and remove the top cover of the engine protective casing.
- Remove the pressure pulsation damper and. using the damper O-ring. install tool Mot. 1311 in its place.
- From the set Mot. 1311 connect the tube and from the Mot. 836-05 pressure gauge with a measuring limit of 10 bar.
- Connect the terminals together «3» and «5» (thick wires) fuel pump relay and measure the fuel pressure. which should be within 3±0.2 bar.
- Use a vacuum pump to create a vacuum applied to the fuel pressure regulator, and the fuel pressure should decrease by the same amount. that the applied vacuum.
- To check the safety function of the fuel pump, briefly pinch the flexible fuel return hose located near the bulkhead, while the pressure should be in the range of 4.5-7.5 bar.
Note. When installing the pressure pulsation damper, use a new O-ring.