Empty Carburetor

Siphoning back to the tank could only happen with a defective flapper valve in the fuel pump, and then that pump would never suck it back up. So Rumble has you covered. And Dana too.

A lil cheaper solution is to keep a small bottle of stabilized 2-cycle gas under the hood, and a small funnel. Then just fill the bowls with ~30/40cc of gas each, thru the vents, and splash a teaspoonful down each primary,prime the accelerator pumps, and HIT IT ! A 710mm coke-bottle lasts me all summer ..... for two cars,lol