Hyundai 1 inch Owner's Manual page 26

2) Turn off the engine switch. Place the engine switch in the 'OFF' position.
OFF
3) Turn the fuel valve lever off. Turn the fuel valve lever to the 'OFF' position.
After use, remove the pump drain plug and drain the pump chamber. Remove
the filler cap and flush the pump chamber with clean, fresh water. Allow the
water to drain from the pump chamber, then replace the filler cap and drain
plug.
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