I have a coleman dual fuel 424-700G stove and a lantern that both have the same issue. I mistakenly left fuel in the tanks over a winter and neither now works. I replaced the generators on both and they still don’t work.
It feels like the pumping mechanism is not working correctly. If I try to pump the pump with my finger over the air hole it is difficult to pump and does not feel like it is building up pressure in the tank. I cannot pump up the pressure and close and turn the pump handle to seal it without letting my finger off of the air hole to let air escape. Neither unit pumps like
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