Outboard Fuel System - Scout Boats 420 LXF Owner's Manual

Fuel System
Fuel Tank Vent
Each fuel tank is equipped with a fuel tank vent
system incorporated into each fuel fill. The fuel
fill cap is designed to seal out water and allow the
fuel tank to vent to the atmosphere when the cap
is closed.
While the tank is being filled, air displaced by
the fuel escapes through the vent and fuel fill.
When the tank is full, special valves incorporated
in the vent and fill hoses close and activate the
automatic shutoff valve on the marina fuel pump
nozzle to prevent the tank from being overfilled
and/or fuel from being ejected from the fuel fill/
vent fitting. You should never attempt to "top off"
the tank after the pump shutoff has activated.
The shutoff valves will not allow additional fuel to
be added after they close and could be damaged
by attempts to force additional fuel into the tank.
After fueling, close and latch the fill cap. Then
wash spilled fuel from the areas around the fuel
fill if necessary. Residual fuel left on the deck and
hull sides can be dangerous and will yellow the
fiberglass or damage the striping.

5.2 Outboard Fuel System

The fuel system on your Scout has three fuel
tanks, port, center and starboard located in the
bilge below the cockpit sole. Each tank is equipped
with 3 or 4 fuel withdrawal tubes, depending on
the engines installed. Each fuel withdrawal line
is equipped with an anti-siphon valve where the
line attaches to the fuel tank. This valve prevents
gasoline from siphoning out of the fuel tank should
a line rupture.
The fuel supply to each engine is controlled by
labeled ON/OFF valves located on fuel manifolds
for each engine in the aft systems room, located
below the center hatch in the rear of the cockpit.
The valves are ON when the lever is parallel with
the fuel flow and OFF when the lever is perpen-
dicular to the flow. All valves can be turned to
the OFF position to shutoff the fuel supply when
servicing the fuel system.
CAUTION
DO NOT REMOVE THE ANTI-SIPHON VALVES FROM THE
SYSTEM. SHOULD THE VALVE BECOME CLOGGED, CLEAN
AND REINSTALL OR REPLACE.
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A fuel filter for each engine is located on each
side of the aft systems room. The filters are the
water separator type and should be serviced fre-
quently to assure an adequate supply of clean,
dry fuel to the engines. It is recommended that
the filters be inspected periodically and the ele-
ments changed as needed or recommended by
the engine manufacturer.
There is a primer bulb in each fuel line located
above the sea chest at the rear of the aft systems
room that are used to prime the fuel system after
service or as required. See Fuel System Main-
tenance in this chapter and the engine owner's
manual for additional information on the fuel filters
and the outboard engine fuel system.
https://www.boat-manuals.com/
Quad Engine Stbd & Stbd Mid Fuel Filters
Stbd Engine Valve Manifold Is Between Filters
Fuel Primer Bulbs In Aft Systems Room