IMO you should add fuel stabl and fill the tank. Cheap ins. Use what the cert. mech reccomends. Also all tanks have some water in them and while the racors will generally handle it is wise to try to keep it to a minimum. If I see any water in the collector I add dry gas during the season. That normally does the trick.
I wish they had a small drain valve at the ***very*** bottom of the fuel tank that allow drainage of any crud and water into a container and removed, most tank drains on tanks I have seen are not at the very bottom they are up 1/2-1" off the bottom
I also use ring free now on each fill. I think that stuff really works.
Also, I know when the mechanic winterizes the engine they use a seperate fuel supply that is rich lubricant.
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