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The Roof Cleaners of Chester County Pennsylvania 610-842-2104 wrote:

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Blake, I didn't have any problems with priming the pump. I never have problems with that, but I make sure that I prime everything at the truck. I make sure I run about 5 gallons of mix through my hose before I even try to take it up a ladder.

If you don't get all of the air pockets out of the line before you take it up on a ladder, you will always have trouble with priming. I had that happen to me one time near the end of a pretty big job where I had to mix up some extra chemical to finish my work. Everything had gone wrong and I was in a hurry and didn't prime the hose before I got back up on this very large roof. I couldn't spray at all. I checked everything thinking I may be sucking air somewhere. I thought the pump might be going bad. I was overlooking the obvious that I had an air pocket stuck in the pump. As soon as I figured that out and bled the line on the ground, the pump worked normally again. Since that time, I have always made sure I run 5 gallons or so through the pump before I start spraying at the job.

Brian

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Wow I never thought of that..We started out with the gas powered pumps and never did the whole 12 volt thing.  I do have a delevan here as a back-up. Now I know what not to do, Thanks Brian!