DUROMAX XP13000HX Service Manual page 21

4.
Drain gas from the generator
With a funnel underneath the fuel valve to catch the gas, turn
the fuel valve to the "ON" position. Drain all the gas from the
generator.
5.
Shut fuel valve OFF
Turn the fuel valve to the "OFF" position.
6.
Replace fuel filter cup
Reinstall the fuel filter cup.
7.
Store emptied gas
Store the emptied gasoline in a suitable place and add fuel
stabilizer to keep fuel fresh and usable.
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