Swimmin gpol problem

My inground pool is having some problems..
1.I have bubbling in one of my return lines
2. When I prime the vacuum hose w/water and connect to intake for vacumming, I then loose all pumping action with no recovery.
I was unable to find any obvous leaks in the suction side lines and no obvious los of water level, could it be that the pump needs to be replaced? It is fairly old.
Any help on troubleshooting will be appreciated.
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There is obviously air getting in somewhere. The two prime candidates would be at the connection to the pump or the pump itself. Try tightening the clamp at the pump intake and remove the drain plug on the pump itself, wrap w/ plumbers tape and reinstall. Hopefully this will solve your problem.
Peter H
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