I don't like to leave a thread I stated hanging so just to tie up the loose ends ... (enough metaphors there to join the Great British Sewing Bee!)
Away for the first weekend in Clarence the Overland Safari Camperbus, with the new-to-me Shurflo pump fitted. Worked perfectly :rabbit:
I also changed over the water 'tank' from the smallish container to the final 25L one. I intend to run a pair of these and move the feedpipe from one to other as one empties and then refill the other. (may sound a bit small, but no shower, so water use is minimal - away for 2 days with two people and used around 12L in total!)
In the process of setting up the new water containers, I rationalised the water pipework so it is reduced a fair bit and no big loop now.
So then moving feed over to new container and pump reprimed fast so that was great.
So just again thanks to Oppy for his very kind donation of the Shurflo. Much appreciated