connected by a common fuel line P.S. Mark what would prevent the fuel from all running to the low wing as in a bank, and if it did would you be able to control the aircraft with one full wing and one empty wing. If I remember correctly and you are using a carb that requires pressure, You might have to add a small header to trap air and another pump to push fuel without the possibility of air. As far as I know the facet will suck and move air down the line until it can get to a clean supply of fuel. What is going to happen to the engine if it is running when one pump hits air. Especially since air will rise in the line. It it seems like it is even possible for the tank to vibrate or cavitate during take off and introduce air into one or both of the lines during the takeoff run. Perhaps this is all covered by things that I can't see in your installation picture.
Orma aka AviationMech 19 Years flying the KR-2
