I have noticed on these forums many people having similar problems with their water draining. I had similar problem with my washing machine. So after finding the reason i have decided to post it here in hope that it answers many posts in these forums.
After looking around in various forums i found that the outlet pipe needs to raise 18mm - 40mm for every meter. So i went back to my machine and used cable ties to give the first foot (aprox) of pipe a steady incline. This solved the problem.
Obviously the pump isnt strong enough to pump the water straight up and out into the stand pipe. So a steady incline is needed for your pump to get the waters speed up before the water tackles any steeper incline.
After looking around in various forums i found that the outlet pipe needs to raise 18mm - 40mm for every meter. So i went back to my machine and used cable ties to give the first foot (aprox) of pipe a steady incline. This solved the problem.
Obviously the pump isnt strong enough to pump the water straight up and out into the stand pipe. So a steady incline is needed for your pump to get the waters speed up before the water tackles any steeper incline.