I've seen epoxy used for a couple of years inside carburetors, though it did break down eventually. Some two-part adhesives are polyester rather than epoxy, and may be less resistant. There is some suggestion that the adhesive will deteriorate considerably faster if you use petrol containing 10% ethanol.
So, it probably depends on the quality of adhesive you use and whether you use the slightly cheaper 'petrol' that contains ethanol. Even if you get everything wrong, though, it should last a while. If you want to get slightly technical you may find this useful:
http://www.boatus.com/seaworthy/fueltest.asp