Do a search here of all of the Ethanol threads Too vague a question in that we have to know what we're talking about E10? E85? "Carb engine" too vague also . . .
It's not about using ethanol enhanced gas, it's about using it up! Ethanol is both hydroscopic (absorbs water) and is a very good solvent. The longer it is left to sit, the more water it absorbs, and the more time it has to eat away at the inside walls of your fuel lines...
Should be no problem as long as it dosnt sit to long. If you plan to let it sit for a wile just be sure to run the carb out of gas before letting it sit for to long.