Thanks very much for the excellent feedback. I've just looked at Shurflo pumps--the 3.5 and the 2.8-- and the 2.8 looks good; mainly it can pump a fair quantity of water even at higher PSI and the extra amp isn't that significant. The one issue is start up PSI. Given the vertical lift, the 'resting' pressure that will remain in the line when the pump isn' working may be more than 25 PSI, in which case the pump will not want to come back on....correct? I'm thinking that I could make a bleed off section of pipe down close to the pump which would have a valve; the valve would close when the pump isn't working. That section would have a very small bleeder hole in the pipe which would bring it below 25 PSI. The pump would 'read' that section and then be willing to come back on. Does this make sense?