Acetone is devastating to several types of rubber and plastic - I am not sure how well those used in auto fuel lines (including filter) would stand up to it, but I sure as heck would try to find out before doing this with assurance. How would you like to have your filter dissolve and be burned up? Fuel lines start gushing?
I'll wait a bit before jumping on this.
"but I sure as heck would try to find out before doing this with assurance."
I sooo agree. I had an inline fuel filter once that simply dissolved and spewed gas all over my engine. Shoulda sued.
In relatively small quantities, diluted in unleaded gasoline (or leaded race fuel if you can afford it and it is readily available) it doesn't have much negative impact. It's like anything, you use it in extremes it can hurt things a lot. But a small amount can be beneficial. Haven't tried Acetone, but used toluene and xylene in gasoline and it has raised motor octane rating of the fuel to around 95 octane (from 87 octane actually--given the ratio i used, 1/4 toluene:3/4 87 octane). It must be good for something, these country bumpkins here in the backwoods of southcentral KY buy/swipe it up in droves (actually for something darker/more sinister in that case, but u get the idea).
Since it is a petroleum derivitive, I would assume that acetone will help combustion, although I'm wondering how it holds up with gasoline. Could be a combustion improvement or a combustion inhibitor, depending on the quantity. I had a bad batch of toluene 50/50 mix in this case fouled out all the spark plugs on a 455 (Oldsmobile) with only 2000 miles on a build. But it's the same chemical composition as gasoline (toluene/xylene, but much higher RON/MON rating in chemical tests--around 118-120 octane) I just wish they'd bring back leaded fuel. It's less energy/time consuming to produce than unleaded, and I'm sure technology can be had to make it burn clean..).