Yamaha F4B Service Manual

2-12
Fuel system
0
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6
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A
Built-in primer pump
This engine is equipped with a built-in primer pump in order to ease engine starting when the float
chamber is empty, or when operating the engine after it has been stored for a long time.
The built-in primer pump sends fuel directly to the float chamber in the carburetor without operating
the mechanical fuel pump.
A Fuel passage (mechanical fuel pump)
B Fuel passage (built-in primer pump)
A
B

Yamaha F4B Specifications

General

Brand	Yamaha
Model	F4B
Category	Outboard Motor
Language	English