PRINCIPLES GASOLINE/DIESEL FUEL SYSTEMS - OD1620 - LESSON 1/TASK 2
(3) The bladdertype fuel cell is much the same as the fuel cell
described above, except for the addition of a flexible liner. The liner
serves to seal the cell much as an inner tube seals a tire.
c. Filler Pipe. A pipe is provided for filling the tank or cell,
designed to prevent fuel from being spilled into the passenger, engine, or
cargo compartments. The filler pipes used on military vehicles are designed
to allow their tanks or cells to be filled at a rate of at least 50 gallons
per minute.
d. Fuel Outlet. The outlet pipe (figure 1 on the previous page) is
located approximately 1/2 inch above the bottom of the fuel tank or cell.
This location allows sediment to fall to the bottom of the tank or cell
without it being drawn into the fuel system.
e. Fuel Gage Provision. A provision usually is made to install a fuel
gage. This provision is usually in the form of a flanged hole.
f. Drainplug. The threaded drainplug shown in figure 1, is provided at
the bottom of the tank for draining and cleaning the tank.
3.
Fuel Filters
a. Purpose. The fuel filter traps foreign material that may be present
in the fuel, preventing it from entering the carburetor or sensitive fuel
injection components. At least one fuel filter is used in any fuel system.
A fuel filter can be located in any accessible place along the fuel delivery
line. Filters also can be located inside fuel tanks, carburetors, and fuel
pumps.
b. Operation. Fuel filters (figure 2 on the following page) operate by
passing the fuel through a porous filtering medium. The openings in the
porous material are very small and, as a result, any particles in the fuel
that are large enough to cause problems are blocked. In addition to the
filtering medium, the filter in most cases also serves as a sediment bowl.
The gasoline, as it passes through the filter, remains in the sediment bowl
for sufficient time to allow large particles and water to settle out of it.
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