Usually it doesn't run at all once much water gets in the gas. Sometimes it'll spit and sputter and stall and have a pronounced power loss.
If your gas has ethanol in it, it can have dissolved water as well as the usual undissolved sort. Dissolved water in the gas just makes it run artificially lean.
damage engine no.. will the engine run no.
If you put leaded gas in an engine that is designed to run on unleaded gas, while the engine will run, it will not run optimally and you will ruin the catalytic converter.
It depends on the engine and how old the gas is.
I would say yes, in theory anyway. You can get hydrogen gas from water. That could be used to run a car.
A little water may show up as a random missfire (P0300). A lot of water and the engine wouldn't run at all.
Gas like water H2O is better to use and run smooth with it. :-)
NO! Don't attempt it. Don't run diesel in your gas engine and don't run gas in your diesel engine! It will cause your engine to run improperly with loss of power and lots of white or blue smoke. It will clog your engine and if you run it with the wrong fuel too long, will result in complete engine failure.
Iodine in a gas tank will run the engine. It will cause rust, and will corrode the engine to the point that the engine will seize.
An engine of that era would run better on leaded gas.
It will shut off, run like it's running out of gas, will damage fuel injector, fuel finter, coil packs, exc.
There are a great many applications that water can do for gas. Water can dilute gas to help it run better.
Usually a car does not run on water. If you have water in your gas you can put in some dry gas and be fine.