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We need to know aprox how old it is to give you a decent answer.

Up to aprox a year of inactivity, you can get away with siphoning out as much fuel as you can then replacing with fresh fuel, fuel filterand adding an additive.

Two years or more of inactivityit would be best to drop the tank and flush it out.

After ten years of inactivitydrop the tank, inspect it along with the fuel lines and the neoprene hose connections, you may consider replacing the tank with a new one.

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Q: How do you clean old gas out of a gas tank?
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