Does this mean I likely have a leak under the deck...?

[Stukeye]

Got a very old pool this winter when I bought a house. Supposedly on inspection this December it was all working fine. Vinyl liner ruptured during crazy winter storm.
Had it replaced and just keep having problem after problem.

my skimmer is not pulling like it was before I closed the pull in December.

I have a skimmer and a wall vacuum port. I had the vinyl liner replaced after it ruptured in a storm, and I don't remember if they had the vacuum port closed off or not, but I'm thinking probably yes.
So here is my issue.

if I have the jandy valve wide open for both the wall port and the skimmer, I have a small air bubble in the pump basket and a few bubbles.

if I close off the skimmer and pull from just the vacuum port there is still an air bubble, but it looks a bit better I think.
However if I close off the vacuum port and leave the skimmer wide open, the water level in the pump basket immediately drops and it starts pulling significant amounts of air. Would it be safe to assume that this means there's some sort of leak sucking air past the jandy valve which would be under the concrete decking?

my theory right now is that it must be small enough that when both lines are open, the pressure of the suction is low enough that it's not as noticeable. But I don't really know what I'm doing. I'm attaching a video of the issue below.

Edit: water level in pool is fine, and I'm not losing any water.

 

[ajw22]

Welcome to TFP.

I would first open up the Jandy diverter valve and see if anything looks wrong with the diverter assembly in the valve.

When you have the valve open and if you have a source of air you can blow down the line I would give that a try.

Have you carefully looked at the way they cut the opening in your new liner for the skimmer mouth?

Have you used Pool Lube on the O ring of the pump lid?

 

[Stukeye]

Welcome to TFP.

I would first open up the Jandy diverter valve and see if anything looks wrong with the diverter assembly in the valve.

When you have the valve open and if you have a source of air you can blow down the line I would give that a try.

Have you carefully looked at the way they cut the opening in your new liner for the skimmer mouth?

Have you used Pool Lube on the O ring of the pump lid?

Welcome to TFP.

I would first open up the Jandy diverter valve and see if anything looks wrong with the diverter assembly in the valve.

When you have the valve open and if you have a source of air you can blow down the line I would give that a try.

Have you carefully looked at the way they cut the opening in your new liner for the skimmer mouth?

Have you used Pool Lube on the O ring of the pump lid

Welcome to TFP.

I would first open up the Jandy diverter valve and see if anything looks wrong with the diverter assembly in the valve.

When you have the valve open and if you have a source of air you can blow down the line I would give that a try.

Have you carefully looked at the way they cut the opening in your new liner for the skimmer mouth?

Have you used Pool Lube on the O ring of the pump lid?

I actually had a plumber nice enough to walk me through the issue with him on the phone and he was able to determine that the problem was actually a clogged skimmer line.
He walked me through how to try to unclog it myself and all I had to do was work the jandy valve back and forth for a little bit and it busted up whatever it was and it's back to working fine now.
Fairly certain it was clogged because the guy who did the liner poured a bunch of stabilizer directly into the skimmer when he opened the pool.