How do you syphon gas out of any vehicle?

Answer 1

You don't for newer vehicles. There is a small grid partway down the gas tank filler pipe which prevents normal sized plastic tubing from going all the way down to the gas. On older vehicles, or if you want to risk damaging or even blowing up the newer car (and yourself) by poking that grid out of the way with a longish hard metal rod, you can drop a plastic tube down into the tank, then, keeping a longish loop of it outside the car below the level of the gas filler opening so you can see when the gas starts to come out, suck vigorously on the end of the plastic tube until you see the loop starting to fill with gas. Then stop sucking unless you want your stomach pumped and/or risk cancer from getting gas in your mouth.

Pinch closed, then take the end of the loop that you've been sucking on and put it into the container you've been keeping nearby to contain the gas that you're syphoning out.

Straighten out the part of the tube outside the car so that the gas in the above mentioned longish loop now starts to flow into the container, drawing more gas out of the car's tank while doing so. The opening of the container must be below the level of the bottom of the gas tank of the car. Also, unless the aforementioned loop had its lowest point below the level of the bottom of the gas tank, you may have to keep pinching shut the end of the tube that you were sucking on while you are straightening out the loop and inserting the end of the tube into your container.