Yamaha 20D Owner's Manual page 104

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1) If there is an air vent screw on the fuel
tank cap, loosen it 2 or 3 turns.
2) If there is a fuel joint on the motor,
firmly connect the fuel line to the
joint. Then firmly connect the other
end of the fuel line to the joint on the
fuel tank.
NOTE:
During engine operation place the tank
horizontally, or fuel cannot be drawn into
the engine.
3) Squeeze the primer bulb with the out-
let end up until you feel it become
firm.
3-15
GB