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That is not a check valve, it is a pressure regulator or unloader, there looks to be a check valve under that, with the green hose attached to it, and another on the line that is after the red, yellow, clear LP lines < the chrome fitting.
I don't know how you could take a good picture of the inside of the plunger, but this is the best I could do, obviously it is a factory default, I have never seen this before.
Also, everything was clean and there was not debris on the plunger or the plunger retainer a month ago.
When tourqued the ceramic plunger would move on the steel rod, the rod wasn't moving, just the ceramic plunger, after replacing the ceramic plunger, no movement.
Took this apart today to fix the leak, replaced both the O-ring and backup ring, put in a new ceramic plunger< actually an old one that I had laying around, and a new plunger retainer bolt and copper washer, after removing the head, that same plunger had play in it from front to back, very...
Beavis and Butthead...huha..huha...I know, lets try going like 60 mph and slam on the brakes, see if we can hold on...huha...huha, yea, that would be so cool.
It only leaks when the pump is running. The slinger washer and split washer were put back on, I left them off for the picture. No threadlock on the bolt.