6 © 2002 6.2 Fuel System Service and Maintenance © 31 812 0 During initial commissioning, after maintenance work or if the tank is run empty it is essential to vent the fuel system. Set engine controller to stop position Place fuel collecting trough under the pressure control valve 9. Open fuel stopcock (if available) and pressure control valve 9. Turn engine with starter (max. 20 sec.) or use hand fuel pump (if available), until fuel with no air bubbles escapes from pressure holding valve 9. Tighten pressure control valve 9. Set engine controller to start position and start When the engine has started check for leaks Changing the filter element 5:
Change at least once a year or as required (drop in performance also after purging) Turn off the engine or switch to other filter in case of changeover filter Close the fuel stopcock or supply (if available) Loosen the cover screws 3 diagonally Remove the cover 2 Remove the spring cassette 4 Remove the filter element 5 from the bracket Insert new filter element 5 Place spring cassette 4 on the element Check that the cover seal is fit properly in the cover 2 and check for damage (change if necessary) Tighten the cover 2 with the screws 3 diagonally (torque 6 Nm) Check the cover 2 for proper fit and leaks Bleed the fuel system, see 6.2.3.
The connection of a warning system (lamp/horn) via contacts 7 is specified. Immediate maintenance is necessary when the warning system is triggered. Naked flames are prohibited when working on the fuel system! Do not smoke! Dispose of old fuel in an environ- mentally friendly way! ! 6.2.8 Clean / purge or change fuel pre-filter © 31 811 2 Clean (purge) - remove water: Turn off engine or, in the case of a change- over filter, switch over to the other filter. Close the fuel stopcock or supply. (if available) Open the bleed screw 1 on the cover 2 Place the fuel collector underneath the fuel pre-filter.
Empty water and dirt from the bowl 6 by opening (press in and turn slightly without using force) the drain cock 8 and close the drain cock 8 again Close the bleed screw 1 on the cover 2 again Bleed the fuel pipe according to instructions, see 6.2.5 opposite © 31 811 2 © 31 811 2