BENETEAU FIRST 35 Owner's Manual page 111

F uel filter
The engine running problems may have different origins, among which 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 it 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.
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-Never obstruct access to the fuel valve.