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 TM 55-1905-220-14-8
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. The vapor maintains pressure within the fuel tank, forcing a supply of fuel back to the carburetor. The
pressure cannot 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 been 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.
4-148
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