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Switchable fine fuel filters
(replacement while engine is running)
1. Place a container beneath the fuel filters. Carefully
clean the filter mounting.
2. Valve lever (2) in the filter cover to its right end
position.
3. Unscrew the left fuel filter and discard it. If neces-
sary, use special tool to remove.
4. Screw on the new filter by hand until the gasket
comes into contact with the filter mounting. Then
tighten it a further half turn by hand.
5. Open left vent screw (1) on the filter mounting.
Move lever (2) to vertical (on-line) position. Close
the vent screw when no more air bubbles are
visible in the fuel.
6. Lever in its left end position and replace the right
fuel filter in the same way.
Venting the fuel system
The fuel system must be vented after the fuel filters
have been replaced or after refilling the fuel tank af-
ter it has been run dry.
1. Place a container beneath the fuel filters. Open
vent screw (1) on the filter mounting.
2. Pump fuel using the feed pump’s hand pump (2)
until no air bubbles are visible in the fuel. Tighten
the screw while fuel is flowing.
3. Pump a further 10–20 strokes with the vent screw
closed so that sufficient feed pressure is obtained.
Further venting is not normally required.
If the injection pump needs to be vented anyway,
undo the overflow valve (3) connection at the
pump and continue to pump by hand until no air
bubbles are visible in the fuel. Tighten the connec-
tion while fuel is flowing. Pump a further 10–20
strokes so that sufficient feed pressure is obtained.
4. Check for leaks.
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