Pump Losing Prime but no visible Leaks

[michaelsuder]

Pump is relatively new ( 1 year old ) and for this test was only connected to the vacuum line in the pool.

Pump is switched on and begins pumping once prime is established (16 psi at the Hayward filter) but then after 5-10 min the pressure decreases and the pump appears to lose prime as psi decreases due to low water flow…

Is this due to possible air leak in the vacuum line from the pool to the pump? Line is 2” PVC and is underground…

I am trying to determine if there is an air leak in one of the 3 lines from the pool ( skimmer, main drain or vacuum ).

 

[ajw22]

Welcome to TFP.

What model pump are we discussing?

Show us pictures of the pump and equipment pad plumbing.

Suction Side Air Leaks

If you see air bubbles coming out of the return lines in your pool, you likely have a leak. Some signs that a suction side plumbing leak has occurred include: Read more

www.troublefreepool.com

 

[ajw22]

Have you put Pool Lube - Further Reading on the pump cover O ring and the drain plug O rings?