Fuel supply circuit checks

WHEN WORKING ON A VEHICLE EQUIPPED WITH A BOSCH MONOMOTRONIC INJECTION/IGNITION SYSTEM THE FOLLOWING PRECAUTIONS SHOULD BE OBSERVED:

• do not start up the engine with the terminals for the electrical connections not properly connected or slack at the battery terminals;
• do not use a rapid battery charger for starting the engine;
• never disconnect the battery from the electrical system with the engine running;
• in order to charge the battery, it should be disconnected first from the electrical system;
• if the vehicle goes in a drying oven after painting, at temperatures in excess of 80 °C, then the electronic control unit must be removed first;
• do not attach or remove the electronic control unit multiple connector with the ignition switch in the ON position;
• always disconnect the negative battery lead before carrying out electrical welding on the vehicle.

Fuel supply circuit checks

1st Test

Checking fuel regulation pressure

Check the fuel regulation pressure as follows:

• disconnect the supply pipe to the injector holder turret (coming from the fuel filter) from the injector holder turret inlet duct;
• place the pressure gauge 1895890000, with both taps A and B open, between the end of the disconnected pipe and the inlet duct for the injector holder turret;
• operate the electric pump with the engine switched off.

This last operation is carried out with the help of the F/L Tester activating the "fuel pump" test.

The value of the pressure read on the gauge should stabilize, in these test conditions at 1 ± 0.1 bar.
If the pressure is too low, carry out the next test.