Besides it being illegal, you SHOULDN'T for several reasons.
Todays cars use a pressurized fuel system, if the ignition is on while the cap is off it will throw a check engine code due to loss of pressure.
Gas in liquid volume is not as flammable as many people think. You can toss a cigarrette in a 5 gal bucket of gas and it will just go out.
However, gas evaporates VERY quickly and is VERY volatile. You run a greater risk of explosion from holding a cigarrette NEAR a bucket of gas than you do throwing it into the gas. If your gas cap is open, there's a MUCh greater risk of explosion from any errant spark contacting the gas vapours.
NO! It should not be running.
yes.
A car consumes fuel when it is running.
Pull the fuse for the fuel pump while the engine is running.
If fuel cannot get through the fuel filter, it will stop running.
Partially clogged fuel filter or the fuel pump is failing.
either your fuel pump is about to go out or you just have a noisy fuel pump but its because it is always pumping fuel when the car is running
Yes, a lot of in-tank fuel pumps are cooled by the fuel in the tank and running the tank dry can destroy the in-tank fuel pump. A lot of discussions about this recommend not running the tank dry for that reason.
I assume you mean add fuel by pressing the accelerator. In which case the engine runs faster.
It is important to maintain speed while driving, unless coming to a stop. A car would decelerate if there was not enough fuel or electricity to keep the car running.
blockage in the fuel lines or fuel filter is a possibility restricting fuel flow when there s no pressure in the fuel tank.
Defective fuel pump, or clogged fuel filter is one cause.