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 TM 55-1905-219-14-8
4-7.4.
FUEL TANK-MAINTENANCE INSTRUCTIONS.
a. The fuel tank is mounted on the top of the frame and cover assembly. It has a dual hose which
connects to the carburetor: one hose for gasoline to the carburetor, and the other for compressed
vapor from the crankcase to the fuel tank. Ihe vapor maintains pressure within the fuel tank, forcing
a supply of fuel back to the carburetor. The pressure can not escape back to the crankcase during
the time the crankcase pressure is low, due to a check valve arrangement at the leaf valve.
b. A diaphragm pump is built into the top of the fuel tank for the purpose of initially priming the
carburetor with fuel. It is necessary to use this pump only when the unit has bee standing idle for some time, or
when the filler cap has been removed.
c.
Removing the filler cap releases pressure within the tank.
d. Initial priming of the carburetor with gasoline is accomplished by a hand operated plunger-
diaphragm pump located on the fuel tank. The only time it will be necessary to operate the plunger on the fuel
tank is when the engine has been standing idle for some time, or has been run dry of fuel. After the engine has
been started, the fuel tank pressure is maintained by crankcase pressure to the fuel tank.
4-146
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