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Update: Permatex technical recommended to use the old O ring with one of their products on top. I opened the vapor separator and found the side of the needle corroded and that made the float stick. New needle, cleaned up things, and reinstalled. Engine ran fine. After further thought...
Has anyone been able to use a satisfactory sealant or replacement for an O ring unavailable from the manufacturer.. It is an O ring for a vapor separator that is under some pressure and in constant contact with gas. Any help would be greatly appreciated.