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.
Can gas be watered down?
Faulty gas pumps mean you could be buying watered down gas, gas with sediment in it, or getting less gas than you pay for. Faulty gas pumps mean you could be buying watered down gas, gas with sediment in it, or getting less gas than you pay for.
How do you get old gas out of a gas tank?
What do you do if you get bad gas from a gas station?
Fixing bad gas, on the other hand, is much simpler. If you have true bad gas – not old gas, or waterlogged gas, then you'll need to siphon the gas out of your tank and pump new gas in. Don't mess around with this, because bad gas can cause damage when it does happen, even if it only happens rarely.
Related Question how to get water out of fuel tank
When can you add HEET to gas tank?
Many mechanics recommend that you pour a bottle of Heet into your fuel tank every time you fill up during the winter months. This is the best practice when it is consistently below twenty degrees. However, if temperatures are closer to thirty, you may only need to use it once every two or three fill-ups.