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Yep, there's two. Done that already.

Another update on this problem: I set up a temporary 1-1/2" PVC suction line from the pump to the pool (pipe layed above ground) to see if I can eliminate the air in the pump. I replaced the pump lid o-ring as well as the the pump drain plug o-ring on the suction side. Still no luck.. air in the...

Just to update: my neighbor came over and we replaced the pipe, elbows, and new union from the pump to the 1st elbow underground that leads to the skimmer and letting everything dry for awhile. The straight piece of vertical pipe that goes underground basically came right off the joint. This PVC...

There might be a small amount of air when attaching it to the skimmer, but normally will 'clear out' and start suctioning properly after a few seconds.

Dave J, Yep I did that this morning. No luck. Like I said, this only seems to be a problem when the Pool Vac is hooked up. I have even taken just a few hoses and connected them to the skimmer-no change, the pump pulsates intermittently like it has air in the system. I'm kind of at a loss here.

Actually I think the inlet is 1-1/2" and runs about 10' from skimmer to pump. Not that it matters. This hasn't done this before with the Pool Vac attached, so I know that this isn't normal. My local pool service will be out Monday to take a look at it.

Here is my problem: When my pool is running from the skimmer, the pump seems to be running fine; a few air bubbles at the pump lid. The pressure holds pretty steady at 12-13 P.S.I. and the suction feels like it's normal. When I attach the Hayward Pool Vac to the skimmer inlet the pump just...