Neptunefix

The folks at my local pool store swear up and down that it must by my Hayward multi-port valve. The handle doesn't snap back into place when you pull it down. I took it apart and sure enough the spider gasket is in very rough shape (glued!) and I guess I'm going to replace the top part of the valve as well since the handle/spring seems worn out. Here's the problem. It doesn't make sense to me. If the multipart was leaking then wouldn't water come out of the discharge line? Wouldn't leaking only occur when the pump is on? Somebody please set me straight.