Lagoon 421 Owner's Manual page 83

ENGINE
F u e l f i l t e r
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 in-
sufficiently 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:
- The first filter is on the pipe that joins the tank to the engine,it has
the functions of a water decanter and pre-filter.
- A second 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 fre-
quently you have to change it, please refer to the engine's manual.
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 re-
move the bowl).
LAGOON 421
8
ENGINE
81