So i have been trying to find a leak on the suction side of my equipment as i am losing water and having bubbles in my return. Well it is getting worse as the pump is now having issue with priming. I have a automated valve in front of the pump that i ever since i got the pool 3 months ago I hear a slight hiss when the pump turns off. I also noticed the filter is now gulping when the pump turns off. My questions is I have checked around the glued section of pvc around the valve and can not find any leaks. I saw a small dribble spot on the pad when i shut the valve off from the front of the connection to the pump but I have not been able to make it leak again. Do automated valves have any gaskets, seals in them that could be leaking rather than the valve housing?