DUROMAX DuroStar DS4850EH User Manual page 49

4.
Drain gas from generator
With a receptacle underneath the generator 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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