Suzuki DF4A Owner's Manual page 30

Using SEPARATE FUEL TANK (For DF6A)
1. The motor has been lowered into the water.
2. If there is a manual fuel tank air-vent, turn
the air-vent screw 1 on top of the fuel tank
cap fully counterclockwise to open the vent.
 WARNING
When connecting the fuel hose to the
portable fuel tank or motor, the fuel may
be under pressure and may spray out
around the connector, causing serious
injury.
Before connecting the fuel hose, loosen
and retighten the fuel tank cap once to
relieve the fuel pressure in fuel tank.
For handling the fuel tank cap, refer to
the "FUEL AND OIL/FILLING FUEL TANK"
section in this manual.
NOTE:
SUZUKI genuine portable fuel tanks have a
semi-auto air vent.
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3. The fuel hose is securely connected to the
fuel tank and the motor.
NOTICE
If spilled gasoline is just left on painted
surface, it may cause a stain or discolora-
tion of the surface coating.
Wipe off any spilled gasoline immediately
with a soft cloth etc.
4. Turn the air-vent screw on top of the built-in
fuel tank cap fully counterclockwise to open
the vent.