SDMO R33C3 User And Maintenance Manual page 54

Checking the fuel pre-filter
The fuel is highly flammable and its vapours are combustible.
The fuel pre-filter must only be bled when the engine is stopped and cold.
Danger
Check that there is no water or sediment at the bottom of the pre-filter.
If necessary, drain the pre-filter using the following procedure:
Place a suitable container under the drain plug prefilter
Undo the drain plug (A) at the bottom of the pre-filter by two or three turns.
Collect the water and/or sediment in the container.
When fuel starts to flow out, tighten the drain plug.
Check that there are no leaks.
If necessary, reprime the fuel circuit.
A
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