B+ motorhomes

burlmart wrote:
Does blowing high pressure air necessarily get out water that lies below the lower lip of the drain pipe, or do you have to agitate the water to get it to'jump up' into the moving air?

My use of an electric leaf blower really is not high pressure, but high volume. It does seem to not only blow all the water out of the tank, but also seems to dry it out. However, when I am on the outside holding the leaf blower against the gravity fill, I cannot see what is happening inside to the fresh water tank.

You're right, that using the pump should do about the same thing.