As in the title really. Im really hoping its not drawing water because of this ( water is not far above tap in van tank) will find out soon, now producing some more and will fill up tank and try. I fear the worst though as I know its worked before lower than this. pumps working away but none coming through. I really thought I had it cracked when moved pump sideways, no airlocks or problems for months, now this. So i wonder do any of yours not work at this level in the tank?