INDIAN347 wrote:
I re-plumbed mine and a short section is running up hill !!! Now when that tank is full it pushes right by that up hill.Sure it levees a small amount in line but it worked very good at this time.Now i wish i had came up higher on the rear pipe it would have made a small difference !
This kinda makes sense to me. It would serve like a P trap. They always have a little left over and keep sewer gases from returning. It might be important to know exactly how much you have to go over to get back to the drain level.