Hi my brain has run dry of ideas, so I realy hope that you have heard of this one before.

When I close the valve of my drain to vacuum the pool via the skimmer, the water barely poors in the pump basket.

When I take off the vacuum hose it has better suction but with lots of air and bubbles.

When I open both valves there is no air nor bubbles at all.

I have changed the pump motor with a new one (hayward 1.5 HP) thinking that the pump might have lost power, but all above mentioned issues remain exactly the same with the new pump.

I took out the filter cartridge to see if it would improve the flo,....but nothing

I rented a camera to check the pipping from the skimmer to the pump to see if it was clogged,...but pipping was clean.

I have replaced all seals from the pump, and again nothing.

I hope you have some ideas I migt try

Thanks a million for your time

Jerrel