air bubbles from hp 2

I have xp 2 air filter which releases some air bubbles every 10 minutes or so. I opened the filter and lubricated in and out water tubes at the base. It didn't take care of it. It is actually doing it more for longer period of time. What should I do. Please help me.

A: If it sounds like air is mixing with the water as the filter pump is operating. This usually indicates an air leak on the intake side of the filter. Please review the Q&A's in the Filstar Performance category for possible answers. If you continue to have problems please contact us again.