Originally Posted by fallingeggs
You can buy this tool at an auto parts
store, you don't have to order it.
Yes, you could damage the hose or fitting but you can cause damage with any tool if you don't know how to use it.
Stick the point between the inside of the hose and the fitting. Work it around the inside diameter of the hose to break the bond. Push it in further and repeat. Eventually you will break enough of the bond that you will be able to twist the hose free.
Don't stick the point of the tool into the fitting, especially if it's plastic. Of course, if you are replacing the pump, this doesn't really matter. This procedure won't normally damage the hose either.
To avoid this problem in the future, while you are at the store, buy a tube or bottle of "Radiator Hose Grease". Coat the fitting and the inside of the hose with this product and assemble it. It will be much easier to remove in the future and this product won't degrade the hose like some makeshift products might. You can even buy this at West marine
I used to have a small I/O boat
and had to drain the block to avoid freezing damage. I would have to do this a few times in the spring and fall to extend the season. I learned a lot about removing and installing hoses in inconvenient locations.