[Richard L]

Thanks for the serial number.

When ever there is bubble around, there will be some leal somewhere on the vacuum side.

Places to look for leaks:

1. Inline filter. The two nylon collars are not squashed or distorted. Tighten after inspection.
2. Fittings between the pump and the water tank

Put some clothing dye in the water, wrap soem tissue paper around each joint, let it rest for a few hours and inspect.