Description of Fuel System
2, 2.3, 3.3
1. The fuel system consists of a fuel tank mounted on the powerhead, a fuel filter and shut-oﬁ valve assembly, and a carburetor. Fuel flows, gravity-fed, from the fuel tank to the carburetor.
4, 6, 8
1. The fuel pump is of the diaphragm-displacement type and is operated by changes in crankcase pressure. Alternately, suction and pressure in the crankcase are transmitted to the pump diaphragm.
2. The carburetor meters and distributes the fuel to be consumed. It controls engine speed and power output by varying the intake charge density. To react correctly to a wide range of operating conditions, the carburetor has multiple fuel mixing circuits.
3. Mixture enrichment for cold starting is controlled by a choke.
1. The fuel system consists of an integral fuel tank ., fuel line and remote fuel tank connection ©, fuel tank selector valve (D), fuel filter ®, fuel pump ®, and carburetor ©.
2. When the fuel is supplied from the integral fuel tank, turn the fuel tank selector valve ® to the forward position. The fuel flows through the fuel tank selector valve to the fuel pump and then to the carburetor.
3. When the fuel is supplied from the remote fuel tank, turn the fuel tank selector valve CD) to the aft position. The fuel flows from the remote tank through the fuel tank connector, the fuel filter and to the fuel pump, where the fuel is then pumped to the carburetor.
Never use both engine mounted and remote fuel tanks simultaneously. When carrying the engine, be sure the fuel tank selector valve is in the aft (remote fuel tank) position.