Join Date: Dec 2001
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If there is pressure in the tank and no alcohol flow to the burners the flash back valve is stuck closed. This valve is basicly a check valve to prevent reverse flow or an explosion. These valves should be located on the stove copper tube at the joint where the flex hose attaches. Stove alcohol contains a small amount of water that causes corrosion at this valve and in the small passage in each burner casting.
From the author of books on boat refrigeration.