tl;dw:
Modern cars are not as easy to siphon gas out of. You’re going to need a narrow, semi-rigid tube to get past any check valve. Make sure this tube is long enough to reach the bottom of the tank.
Of course, if you’re not concerned about the car, you can punch a hole in the bottom of the tank and capture the fuel that way, but you’ll certainly waste some fuel.
@horse_battery_staple makes an excellent point: If you are uncertain about the quality of the fuel you are siphoning - whether that be because of its age, contaminants (rust/water), or if it has two stroke oil in it, be aware that the vehicle you run the fuel in may run badly, and you may incur mechanical problems, either in the short or long term. Generally speaking, “she’ll run,” especially if you’re cutting the acquired fuel with known good fuel, but you should consider this as an “oh shit” option.
Check for the color of the gas. Lots of two stroke fuel in those sheds.
A little 2T oil ain’t gonna hurt anything. The video also mentions gas “going bad” after about three months. While it’s true that gasoline loses its combustibility over time, you’d be surprised at what fuel you can still run. The engine may not like it, but it might go, especially if you’re mixing old gas with newer.
High compression low displacement engines don’t run well on 2T. So basically every cheap economy car made since the 80’s. Especially if it’s the only fuel it’s starting on.
Sure, pure fresh gas will be better, but old 2T will probably still fire.
And cheap economy cars don’t have high compression. They run fine on 87. What will give you more issue is all the emissions/sensors, and especially fuel injection. Carburetors are more forgiving of less than ideal fuel.