BENETEAU OCEANIS 31 Owner's Manual page 121

Fuel filter
Engine running problems may have different origins, including dirty fuel. The injection pump may wear out if there
is water in the system.
The water results either from the condensation resulting from an insufficiently filled tank, or from a filler cap either
not closed properly or with a damaged seal.
In order to prevent any water infiltration, the fuel runs through two filters:
- One filter is an integral part of the engine, its role is to filter fuel very finely. To know when you have to
intervene and how frequently you have to change it, please refer to the engine's manual.
- The second filter is on the pipe that links the tank to the engine, it plays the role of a water decanter and
prefilter.
Drain by undoing the knurled screw at the base of the decantation bowl(but not removing it).
Allow to flow into a box till the fuel looks clean.
Do this several times a year.
Change the pre-filter at least once a year (access to it when you remove the bowl).
As for the procedures in case of fire, refer to Chapter 2.
Stuffing box
You have access to the stuffing box through the central technical compartment behind the engine.
Lubricate the seal every 200 running hours (or at least once a year).
Apply the grease the manufacturer recommends in his instructions.
After launching the boat, drive the air out from the sleeve pinching it with your fingers.
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-Never obstruct access to the fuel valve.