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Catch them doing it or have a mechanic flush your lines if you suspect shinnanigans. Obviously do not drive it if you suspect someone is stupid.
If you suspect that someone put sugar in the tank of your car, the best thing to do is to make an appointment to have your filters cleaned at a garage. Sugar in the tank will not disable your car, this is a common myth, but like pouring sand into someone's gas tank, it might cause your filters to need cleaning earlier.
there will be concreet inside your gas tank
youll have to drop the gas tank and empty it... dont start it the car either
No, it's gas. There is chemical energy stored in the gasoline that can be released by burning it, which I suspect is what you were really trying to ask.
it will probably ruin the gas tank and be considered vandalism
No it can't and won't hurt anything, It will just lay on the bottom of the tank.
maybe someone stole your gas tank
Yes, get that thing out of there. It's gonna ruin your engine.
Someone probably put sugar in your gas tank.
Personally if you can't siphon out all the liquid out of the tank I would just fill up the tank with gas and let it run.
Have someone trigger the release inside the passenger compartment while someone else is prying the gas tank cover with a screwdriver.