Bukh D4 - Fuel System and Freshwater System Maintenance

Fuel system, bleeding
The fuel system must be bled after a filter change, if
the fuel tank has been run dry and after a long-term
stoppage.
IMPORTANT:
Never disconnect the pressure pipe.
1 Connect
a transparent hose to the bleed nipple (1).
Feed the hose to a container to avoid spillage.
2 Open the bleeding nipple and pump fuel with the
hand pump (2) until the fuel is free from bubbles.
Close and tighten the bleed nipple.
3 Pump a further 10 times on the hand pump.
Resistance in the hand pump can feel heavy, but
this is completely normal and necessary to bleed
the system.
4 Remove the hose and fit the protective cap to the
bleed nipple.
Water in Fuel
If the EVC system warns for too much water in the fuel
filter, the water separator needs emptying.
IMPORTANT:
Do not continue operating if there is water in the water
separator, it can damage the engine.
Draining the fuel filter
1
Stop the engine and turn off the ignition.
2 Remove the connector piece (1) from the
sensor(2).
3 Place a container under the fuel filter and carefully
unscrew the sensor (2). Let the water run out. When
diesel runs out, screw in the sensor until you feel
slight resistance. Then tighten an additional 1/4 to
1/2 turn.
IMPORTANT:
If the sensor is torqued more than 1/2 turn, the
sensor can be damaged.
4
Refit the connecting piece (1).
Maintenance
96 47708085 11-2016 © Bukh