I do exactly this for my jet skis, in addition to adding antifreeze in the cooling system, but i have never thought to do this with the other equipment.
My pre-winter tasks have always been to change all the fuel, oil, spark plugs and clean all the filters on everything that isnt to be used till next year. I then fill all fuel tanks with ethanol free premium fuel with marine grade sta-bil added.
For the past 2 winters that ive added the sta-bil and non- ethanol fuel, i have no longer had engine problems come summer. In the past, i had to deal with clogged carbs all the time. dont get me started on ethanol..........
I was told by a few mechanics not to leave the fuel tanks empty or they could cause some dry-out issues. not sure, if this is true, but so far no dry out issues by leaving them full.
it might be easier to heat my shop all winter :cool2: