Fuel Filter Service

TM 10-3930-633-12

fuel into the container while observing the time

Some fuel spillage will be unavoidable

required to expel one pint. Close the restrictor.

during filter replacement. Do not smoke

One pint or more of fuel should be expelled within

or allow use of open flame in the vicinity

30 seconds.

(3) If the pump volume is below

during this procedure.

specifications, repeat the test using an auxiliary

(1) Unscrew the filter housing from the fuel

fuel supply and a new fuel filter. If the pump

pump, and remove the filter element and gasket.

volume meets specifications while using the

Discard the element and gasket. Clean the filter

auxiliary fuel supply, check for a restriction in the

housing in cleaning solvent.

fuel supply from the tank and for the tank not

(2) Place a new filter element over the spout

venting properly. If pump volume will not satisfy

in the fuel pump valve housing cover. BE SURE

specifications, replace the entire pump assembly.

TO USE THE PROPER TYPE ELEMENT FOR

4-51. Fuel Filter Service

THE INSTALLATION. Coat a new gasket with

light engine oil and position the gasket on the

a. General. The fuel filter element should be

filter housing. Screw the filter housing onto the

replaced at each 500 hour interval and also

fuel pump. Hand tighten the filter housing until

element

fuel

whenever

c o n t a m i n a t i o n or

the gasket contacts the pump, and then advance

restriction is suspected as a cause for engine

it 1/8 turn.

malfunction.

(3) Start the engine and check for leaks.

b. Filter Replacement. Refer to figure 4-26 and

proceed as follows: