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 TM 55-1905-220-14-5
3-70. FUEL FILTER, FUEL STRAINER-MAINTENANCE INSTRUCTIONS.
a. A fuel strainer (primary) and fuel filter (secondary), are used to remove impurities from the fuel. The fuel
strainer is located between the fuel tank and the fuel pump. The replaceable density-type element is capable of
filtering out particles of 30 microns (a micron is approximately .00004"). The fuel filter is installed between the
fuel pump and the fuel inlet manifold. The replaceable paper-type element can remove particles as small as 10
microns.
b. The fuel strainer and fuel filter are essentially the same in construction and operation.
c. The filter and strainer consist basically of a shell, a cover and a replaceable filtering element. The
assembly is made oil tight by a shell gasket, a cover nut or bolt, and a cover nut or bolt gasket.
d. The central stud is a permanent part of the shell and, when the unit is assembled, extends up through
the cover where the nut or bolt holds the assembly together.
e. A filter element sets over the central stud inside the shell and is centered in the shell by the stud.
f. Operation
(1) Since the fuel strainer is between the fuel supply tank and the fuel pump, it functions under suction.
The fuel filter, placed between the fuel pump and the fuel inlet manifold in the cylinder head, operates under
pressure. Fuel enters through the inlet passage in the cover and into the shell surrounding the filter element.
Pressure or suction created by the pump causes the fuel to flow through the filter element where dirt particles
are removed. Clean fuel flows to the interior of the filter element, up through the central passage in the cover
and into the outlet passage, then to the fuel inlet manifold in the cylinder head.
(2) The following paragraphs contain the maintenance instructions:
DESCRIPTION
PARAGRAPH
Fuel Filter
Fuel Strainer
3-1246
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