My pressure gauge was reading 0, so I assumed it was bad. Bought a new one and changed it out and the new one still reads 0. I am getting sufficient return to run my Polaris 165 pressure side cleaner and there is good flow out of the return. When I replaced the gauge I cut the pump off, closed the Multivalve, and shut off the return line - there still was a stream of water that came out the gauge port. Now for background: I have had a persistent air leak on the suction side for a long time. The water in the pump basket always goes down to the intake level as soon as the pump goes on. I have not been able to find the leak. Recently I added a Liquidator and had to close the valve between the skimmer and the pump some to get enough suction. Before installing the LQ my pressure on a clean sand filter was between 8 and 12, after installing the LQ and getting it running properly my pressure went down to 5. Now it has gone to 0. The pool is in good shape and the chemistry is good and as I say I am getting water out of the return, but it bugs me to look at the gauge and see 0. Anybody have any suggestions as to what is going on?