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 by fuel pumps. One fuel pump is used to
move fuel from the fuel tank to the fuel fi lter, while a second pump
will pump fi ltered fuel to each cylinder in the engine block. The fi lter
normally located right next to the fuel pumps is meant to take out
some small debris as well as small amounts of water. Fuel fi lters
are not able to remove large amounts of water. If the fuel becomes
contaminated with water, the fuel must be run through a fuel polisher
available at select marinas to remove large amounts of water.
Fuel Injectors
After the fuel has passed through the fuel pumps and fi lter, it is ready
to be injected into the engine. Because boat engines run off four
strokes (intake, compression, spark, exhaust), fuel must be delivered
to the appropriate cylinders at the appropriate time for optimal engine
performance. This action is performed by fuel injectors that inject an
air and fuel mixture into the engine cylinders.
3-13
Engine & Controls
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