CHAPTER 3
Anti Siphon Valve
The anti-siphon valve at the base of the fuel feed line is pulled off its
seat by fuel pump pressure as the engine is cranking or running. It
forms a one-way fuel roadway by sealing off the fuel feed line from
the fuel fi tting. It prevents fuel from siphoning out of the tank in the
event of a fuel line rupture, or disconnected fuel feed hose. It is an
important safety item, so DO NOT remove the anti-siphon valve.
Fuel Vent
Fuel vents are often combined into the fuel fi tting on the deck. Fuel
tanks are vented overboard for the fumes to escape. While the tank
is fi lled with fuel, air is displaced by the incoming fuel, and relieved
through the fuel vent hose. When the fuel tank is near full, slow down
or stop the nozzle fl ow to keep the fuel from splashing out the vent.
Fuel Hoses
Fuel hoses transport gasoline from one component to another. These
hoses are required to be of certain diameters in order to comply with
engineering and environmental standards. Hose clamps are often
used to seal the hose to a fi tting, and these connections should be
checked regularly.
Fuel Pumps/ Filter
From the fuel tank, gasoline is moved from the tank to the engine
by the pressure produced in fuel pumps. Fuel fi lters are not able to
remove large amounts of water. If the fuel becomes contaminated
with water, the water separator must be replaced.
3-10
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