If water doesn't go into the pressure tank you will not have water pressure.
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No you don't need a tank to simply pump water from a lake. You would only need a tank if your using a pressure switch to turn the pump on and off.
Most, though not all, motorcycles are air cooled and there for do not need a water tank.
You need to drain the tank.
if its a bladder type tank, it will need to be replaced
If you are on a well.
You would need to pour the water into the bowl.
go to www.kwikot.com and there you can view and download a file on a hot water pressure tank
If it is a small amount of water add a can of Heet to the tank and fill it with gasoline. If it has allot of water you will need to pump all fuel out of the tank, add a can of Heet and fill the tank.
You can use a fuel tank additive called "Heet." Basically, Heet is a type of alcohol which mixes with the water in your tank and allows your engine to burn it. Depnending on the amount of water the tank could need removed or drained.
You need a tank, food, water purifier, someway to aerate the tank, and (of course) sea-monkey eggs.
If you are coming from a city or county water main you do not need a water tank or pump system as the main should already be pressurized.