Craftsman 108.27807 Operator's Manual page 37

The fuel tank filler cap (1) is located directly behind the handlebar. Refer to Section
19 "Specifications" for tank capacity. Use regular unleaded gasoline. The fuel
valve selector is located on the left side of the front fender and has three positions:
OFF: For vehicle storage and whenever transporting.
ON: For normal operation.
RES: For reserve supply in the event of main supply exhaustion.
1
NOTE: The reserve supply has about a 6 mile /10km range of gas. Always refill the
gas tank as soon as possible after having used the reserve supply. Always return
valve to ON position after refueling the machine.
Fuel Filter
The filter should be replaced every 100 hours of operation or annually. Do not
attempt to clean the fuel filter.
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