I have always treated my stored gas with Sta-Bil. I stored an engine long-term before. In that one I used Sea Foam fogging oil that I put directly into the cylinders after pulling the spark plugs. All have worked well.
I have de-lacquered a carb that was not stored correctly. After taking it apart and soaking with straight Sta-Bil for 10 minutes, the lacquer coating left by the gasoline came off with just a simple Q-Tip.
so ... I have found all these products to work well, when used per the instructions.
I once stored fuel in a motorcycle (carb, not FI) using only Sta-Bil for 7 years (not starting it for that long). When I went to re-start it, it fired up w/o issue. I would not have believed it if I had not done it myself. I DO NOT recommend this. I also immediately topped it off with fresh fuel.
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