The only thing that would happen is the clogging of the fuel pickup and or/fuel filter/pump. This is assuming you can keep the chocolate melted. If you are using a syrup, everything above still stands as correct... bigger question is... why the hekk would you want to?
Don't know. Just don't do it
Nothing.
By heating chocolate is melted; after this chocolate is thermally decomposed. Chocolate gas doesn't exist.
pancake sryup is my gas tank, what do i do?
the tank will leak
What happens when chicken bone gets stuck in gas tank
pancake sryup is my gas tank, what do i do?
You will likely need to drain the gas tank.
remove the fuel tank and drain the water
Nothing
any kind of chocolate smell makes me gag, so i got to say it smells like a stunk put gas on it a 1,000,000,000 times
You'll have infinite gas and live forever.