Re: probably stupid question
Run empty and have to re-prime you fuel line and carburetor, crank on starter with engine choke on, now your fuel flooded because engine was already warm and your battery is now getting weak, your throwing out the anchor.
I learned the hard way to always switch tanks before you run out, it's not hard to reach back and give the tank a little shake if you can't see through it.
Your tanks are sitting side by side it shouldn't take more than about 60secs. to switch between tanks, I do mine with engine running and don't even have to be fast about it, you'll have time to switch tank positions but you really should get longer hose.