Bleeding the fuel system

Bleeding the fuel system

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High-pressure fuel system

After removal or replacement of the high-pressure fuel lines it is not necessary to perform external bleeding in order to start the engine. The fuel pump produces a high fuel pressure during starting and discharges the air at the highpressure side through the injection nozzles.

Procedure:

Turn the electrical system key switch to position I but do not start the engine. The electrical fuel pump now runs for about 30 seconds and vents the system (the running noise of the pump can be heard). After this, start the engine. If the engine does not start then turn the keyswitch back to position 0 for about 30 seconds. During this time the engine electronics performs a reset. Then repeat the venting procedure. If the engine now starts then the system has been vented.

Bleeding the fuel system Read and observe: “Fuel system, safety instructions”

After repairs on the fuel system or after cleaning of the fuel tank, the system must be bled.

Procedure:

1. Slide the hose (6, Fig. 1) over bleeding valve (3). 2. Insert bleeding hose (6) into a collecting receptacle (7). 3. Open bleeding valve (3) with an open-end spanner (turning counter-clockwise). 4. Press button (2) of the hand pump repeatedly until there are no more air bubbles to be seen in the hose (6). 5. Close bleeding valve (3) with an open-end spanner (turning clockwise). 6. Withdraw hose (6) with collecting recipient (7) from bleeding valve (3) and dispose of the collected fuel in compliance with state-of-theart techniques in closed containers.

The fuel hose (6) must be resistant to fuels and transparent.

Check all lines and connections and the fuel filter assembly for leaks.

Fig. 1

Designation

1 Filter cartridge 2 Pump button of hand pump 3 Bleeding valve 4 Sensor 5 Connector 6 Draining hose, transparent 7 Collecting receptacle

For the removal of fuel use only state-of-the-art closed systems. When handling inflammable liquids, observe the regulations for inflammable liquids and other applicable regulations such as the explosion protection regulations.

Work on electrical systems, instructions

The operator control panel must be disconnected from the electrical system of the machine by unplugging the connectors before working on the electrical system or before performing welding operations. Turn the electrical system keyswitch to 0 and withdraw the key. Electrical interface connections may only be closed or opened vie the respective male and female connectors.

Deadly danger from shortcircuits

Disconnect the batteries prior to any work on the electrical system where tools, spare parts etc. might come into contact with electric cables or contacts. For reasons of safety, disconnect the positive pole terminal of the battery before removing the relay cover (1, Fig. 1). When the cover is removed and the protective cap on the relay has slipped out of position, then a danger exists of the cover plate touching the relay contact and the machine ground at the same time.

Fig. 1

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