Regular gas will eat up the foam, and you will be replacing your fuel filter, pump, injectors, jets, or any thing fuel related. But if you use racing gas than the chemical make up of it has no affect on the foam. It is a much "dryer" of a fuel.
I didn't say nitro. All the guys in the club get there gas from the air port. My buddy had that crap in his tank and ran pump gas and the stuff deteriorated and made a real mess. I don't run it in mine and I don't have any problems. I wouldn't want to chance it.
I ran it for with foam for 2 years...I got it used..the person before me ran it for a year or 2...I sold it and that person ran it for a couple years...NO ISSUES..all pump gas