priming raw water pump?

After removing my impeller on the raw water pump for winterization, I realized that I still need to run the engine once more to fog it. So, I put the impeller back in. Do I need to somehow prime the pump to get water in the impeller so that it does not melt? I'm doing this in my driveway and usually run a hose through one side of the filter housing or using a fake a lake. Will the impeller suck air well enough to prime itself?
I know that if I was on the water, the pump would have help from the lake water coming in and trying to displace the air in the hose on its own. Does water usaually drain all the way out when the boat is pulled out of the water, or does enough remain in the pump housing (between the vanes)to keep it primed? My pump is bone dry right now and I do not want to melt the impeller.
Thanks.

agree...no need to do anything but start her up with a hose on it! Water will reach the impeller quickly.

Tim, I always worry about running the engine without water flow. The temp rise in the exhaust is extremely fast and I figure warping can occur even when running for a short time.

I have a jet boat with aluminum manifolds, maybe I'm just gun shy because I had to have them machined to flatten them out.

Thanks, Guys. That is what I suspected, but just wanted to be sure. I never had to winterize my Boston whaler's outboard when I lived in FL. This is my first inboard and my first time to winterize.
As always, thanks to all of you folks that responded. In the few months that I've had her, I have learned so much from you guys.
Much apppreciated!
Chris