Today I noticed the timer turned on the pump and the water started flowing and it makes a lot of gurgling noises at the pool for a few seconds then stops (this is normal as air bubbles out of the line, etc..) but today it did it again after a few minutes.... so I went out to the pump to check it out and the pressure gauge was at 0. I turned it off and took out the filter. It needed a good cleaning! Then I put it back, opened the air bleeder valve at the top, turned on the pump and as usual heard the air hissing out. When water starts squirting out I close the bleeder valve and normally the pressure valve goes to 10... this time it was climbing as the air ran out and up to about 10 when water squirted out but when I close the air bleeder the pressure dropped to 0 and I could see water wasn't moving through very much. I shut it off and tried making sure everything was OK but no matter what I do the same thing happens. I tried switching it to waste and that pumped water out as usual.... but going back to the filter as soon as I close that air bleeder it seems to stop water flow and pressure. Makes no sense to me.
What should I be looking for?