Mike, it cuts the varnish out of cab,fuel pump and anywhere gas may sit. If you have never run it dose that new motor up pretty good with it and run the snot out of it. Leave it sit in carbs a few days then run it again. Then just add a couple of ounces every time you fill up. Also good to add some Marine Stabil every fill up. Check your motor for a filter under the cowel. If it dosent have one you need to add one between tank and carbs.
Proud Member of Team Geezer
Charlie Weaver USN/ENC 1965-1979