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Have a 2 pipe oil pump A2va7116. Customer had water in oil, had water pumped out. Now when we have an oil cannister installed, there are what appear to be air bubbles going to the pump. Changed all gaskets on the filter cannister, same thing. Replaced with new cannister and fittings, same thing. With cannister removed, no bubbles and system runs fine. Vacuum is 8", doesn't change with or without the filter. When system is off, the bubbles seem to migrate slowly toward the tank, but, vacuum doesn't rise. The only thing that has changed since last year when we had no problems, was that water got in the oil. Please help.