The best way to remove water from the gas tank is to empty the tank with a vacuum machine, replace the fuel filter, and refill it. You need a vacuum machine to suck out all the water from the tank, so this job is better to leave to a mechanic workshop with these machines to do the work for you.
What do you do if you have water in your gas tank?
How much does it cost to remove water from gas tank?
Water tank removal cost $300 to $1,500 or more. Since they don't contain any hazardous chemicals or fuels, you don't need to do any soil testing or remediation.
How does a car run with water in the gas tank?
Water in the gas tank may lead to the car bucking, stalling or not starting at all, or starting the car could be difficult. This is because the water and fuel separate, especially when the car has been sitting for a while, and the water sinks to the bottom with the fuel on top.
Related Question how to get water out of a gas tank
What happens if a drop of water gets in your gas tank?
Water in gasoline doesn't just cause issues in the cylinder; it can easily damage injectors if it expands rapidly in the injector tip (due to the inherent heat of the injector). And if it sits in the fuel system for a long period of time, it can even cause rust in your fuel system.