Nope, it's an urban myth. All sugar will do at most is clog up filters. Pour a little sugar in a glass, add sugar and the sugar does NOT disolve, it settles in the bottom as a wet mass. It would cause the car to stall when the filters clogged though.I've heard sugar works wonders.
I used to have a 5 gallon can sitting right inside the garage. It was full of gas, paint thinner, and other assorted fluids. Never got a taker for it though.Just add a little on-road diesel to the gas, if no takers you can always use it for burn fuel by adding more diesel. If they are getting it out of your Car or a big tank there is not much you can do except lock it up. I broke my gas hijackers up unintentionally, they grabbed a can of my burn fuel and dumped it in their car.
We all know e fuel will cause issues because the ethanol allows water to mix with the gas. Might add more ethanol (i.e. wood grain alcohol) to the gas and see how much water you can mix with it and not have it separate and stay suspended. Maybe with enough water in the gas it might cause some issues. But I'm just guessing.
Or maybe just add the wood grain alcohol to the point that it will run so lean it may make the fuel so dry with no lube quality's it might cause harm.
If you know who it is and what they are putting in in, you could donate a full can of gas to the interior of the car on the drivers seat.
Trap a skunk and put it in his car so he wont ever want to drive the car again. If he aint driving it, he might stop stealing gas to drive it.
I knew a guy that bought deer scent killer witch was skunk stink that you can buy at a walmart.
Take a large syringe and stick it through the rubber door seal and squirt it in the interior making the car stink so bad he wont drive it.
Or just torch the car and watch it burn. Poor break fluid all over his car that will destroy the paint job. Slash his tires. I wonder what break fluid added to gas will do. Knock a hole in his gas tank so the gas he steals will just run back out on the ground. Damn, I'm going a bit to far here. never mind.
If his car has any aluminum on it, spray the aluminum with EZ off oven cleaner, It will make aluminum corrode instantly and it will never come clean ever again and it will look like it's 100 years old. What ever you do, do it your own risk, you didn't hear it from me.
Camera and catch the SOB.Thanks guys. I've got some good ideas. Just not sure how far I want to go with it.
And no, if I've got a gas jug that I use for my fires in my shoo and someone steals it and pours it's contents into their truck, i don't think I've got any legal worries.