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Does it smell like bad gas? If it doesn't smell sour you may be able to just run it out.

If your worried about varnish and crud, drop the tank and drain it.

You could even use the electric fuel pump to pump it out, but then your still running bad gas, and sucking varnish or whatever into the pump/filter.Or filter screen if it hasn't deteriorated

No elect pump.i was able to find a line under the engine to drain it but boy is it SLOOOW! And O YEH it smells FUNKY.