It has to be done safely because if it isn't you and the building will burn to death.
WHy you do it is usually to repair the tank or change the fuel pump.
Usually they use an electricfuel pump and pump it out.
Yes if your tank is empty but not if it has some diesel in it, But not if your car runs on gasoline.
This is called siphoning. The gasoline-filled tube, when the end that is not in the gas tank is lowered to a point below the tank, it creates a pressure differential inside the tube. Just as liquid pours from a glass when it is tilted, so does the gasoline flow through the tube. As long as the tube in the tank is below the level of gasoline in the tank, the gasoline will continue to flow until the flow is interrupted (or until the tank is empty).
t will work if only half the tube is filled so a column of air will be trapped between both ends. As the gasoline in the tube flows out of the tube, it pulls the column of air between gasoline and the other end inserted into the tank creating a suction effect. The empty barrel has to be lower because as gasoline inside the tank is drawn into the tube, gravity has to take over to make the gasoline flow downward.
siphon gasoline it only works if he lowers the plastic tube lower then the level of gasoline it pulls the fluid out by gravity. it works better to drain the gas if there is a drain plug though
Try to fill the tank with gasoline and fuel injector cleaner in order to dilute the fuel present in the tank which may be causing the problem.
gallons
a car bomb
I went to the gas station to get some gasoline for my truck. Without gasoline in the tank, the car wouldn't run.
After removing tank from car you can siphon fuel out.
You must remember that (in tank) fuel pumps get lubricated by gasoline. If you run out of gas and keep trying to start the car with no gas in the tank....then the fuel pump is spinning without lubrication. So the pump can lock up. I see that occasionally here at my shop. However, if you put in enough gas to submerse the pump then beat on the gas tank with a baseball bat then the pump will sometimes free up and work again. If your gas tank has been empty for a week but you havent been trying to start the car with no gas in the tank then you will probably be ok. If you ran the car out of gas and kept trying to start it then the car sat for a week, then you may have problems. It all depends on the conditions that caused your empty tank and what you did after you ran the car out of gas.
It'll have to be at a lower level than the car's gas tank, although, in reality, he would have to remove the fuel tank, disconnect the neck (as modern cars come with an anti-siphon neck), and either place the fuel tank at a higher point than the receptacle, or else use a vacuum pump (with diesel fuel, it's fine to use an electric one, and that's what we do at my shop.. gasoline is much more volatile, though).