An outboard fuel bulb is a small, hand-operated pump that is used to draw fuel from a gas tank and into the carburetor of an outboard engine. The fuel bulb is connected to the fuel line with a hose, and has a one-way valve that prevents fuel from flowing back into the tank.
To use the fuel bulb, first make sure that the engine's stop switch is in the off position. Then, unscrew the cap on the fuel line and connect the hose to the barb fitting. Next, open the vent on the gas tank and place your thumb over the opening in the hose. Pump the bulb until it feels firm, then screw on the cap tightly. Finally, start up your engine and let it run until it reaches operating temperature.