Sorry Bernie I didn't see your question till today. To answer your questions, no you don't have to have the pump handle in any particular position when you use the electric pump. Yes you can install only one pump and leave the other as a manual only (see check valve discussion below). Lastly on the check valve question, the faucets have check valves built in. They are the white plastic part screwed onto the bottom of the faucet. There is a small rubber flap in there that acts as a check valve. There has been some earlier discussions here about those valves and their ability to maintain a prime. Like another person mentioned (in archives), perhaps because it is a new boat (260) that there may be debris in the water lines that foul the little check valves and prevent them from working correctly. The symptoms are that you can't use either sink without plugging the other one due to air leaking back throught the 'other' check valve. You then have to re-prime every time. As was mentioned, and as I have done twice now, you can remove the check valve assy. from the faucet and clean them out by blowing/use a small tool such as a screw driver or such to dislodge junk and actually test their operation before putting them back in. Then they work fine. On a side note, originally the water line was attached to the faucet (check valve assy) with the hose bib part broken off, clearance issue (?). I was still able to get a hose clamp around it to hold the hose from the pump, but it was precarious. I called Hunter and got replacement check valves that came with the hose bib intact. If you do that and later need to remove the valves for cleaning again, be EXTREMELY careful when removing the hose used to install the pump cause the hose bib is VERY fragile. The first time I did that it snapped right off there with little effort. I was trying to twist the hose off the bib, and...snap! I am thinking of installing another inline straight through adapter so that you can disconnect it there and have a short piece of hose left on the valve assy so that you don't have to even attempt to remove the hose from the valve assy. Should prevent the problem altogether and you could clean them out as often as needed without fear of breaking them. Eventually I expect the lines will clear out and I can stop having to clean the check valves. With everything working correctly, I just hand pump the faucet till I get prime and then either the hand or electric pump works fine. Hope that helps. Good luck. Tom M.