Self-Priming Pump Basics Pt. 2 Failure to Prime - Gorman-Rupp

Gorman-Rupp Service Manager Mike Austen explains issues that can lead to a failure to prime with a self-priming centrifugal pump. This video is the second in a series of videos on hydraulics, operation and troubleshooting of self-priming pumps. www.grpumps.com
Crane Engineering is the local authorized distributor for Gorman-Rupp in WI and MI. www.craneengineering.net

[@MyAdam51]

exclusive MR MIKE AUSTEN.

[@stevepagliuso1333]

Not sure who else to ask but you seem very knowledgable. I'm using a 10" Gorman Rupp self priming prime air pump in a creek that has a huge pool area that I'm pumping out of. The pump primes itself easily but when losing prime, it cannot reprise itself. We've done this many times but never had this problem. The pump will actually pull the water right up to the pump but won't pump. Any suggestions?

[@james-hs8kd]

im having a similar problem but on a smaller scale.I suspect it is due to binding, i am going to try a air breather valve on the discharge line.

[@simonguerette9534]

A couple of things could happen here:
Discharge check valve worn out.
Check valve on ventury line collapse.
Suction pipe had a hole in it.
Float on the priming chamber is unscrew .
Piping from compressor to the priming chamber is worn out.

[@abdelrahmanmohamed5768]

I didn't understand well enough, unfortunately.