Hello all. Working on the owners side shower and having issues with back pressure against the shower sump pump. Of course, there is NO way to get under the actual shower to inspect or replace the line. Once I get the pump primed and flowing it will clear the pan but if I drain it all the way I start getting back pressure from the line leading overboard and it¡¯s difficult to get the pump primed enough to override the back pressure. Any ideas on how to get the line draining overboard so it can be clear? I¡¯ve followed the line from the drain through the pump and down the starboard side to the thru hull just above the engine exhaust. For some reason there must be a droop or slight kink in the line causing it to not drain all the way, and the sump pump must overcome that pressure to start pumping overboard. Thanks for any ideas or assistance. Can¡¯t believe there is no physical way to get to the lines under the shower stall. Geez!
J W