Yong heng did something strange

So when I was getting done filling today I went to bleed the pump down and shut it off and there was a popping sound and several little pieces of soft foam shot out the fill nipple. If anyone has any idea what this was all about or if it has happened to you as well please chime in and let me know. It only has 2.5 hrs on it. Oil level is good. Never got it hot. Trying to keep this one going for a while. Thanks in advance.
 
That's what happened to mine. You need to Teflon tape that sucker and tighten it down properly. Watch out for the crush seals because if your not careful they won't seal again the second time. You don't want to tighten them too much. Do them snug and try it if it leaks tighten a little more and repeat if necessary. The replacement parts are 15 bucks on Ali express but they take 3 months to get here. I would order them now just for the future. 
 
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Piece of cotton from filter A was pushed backwards thru high pressure moisture purge block by air flowing from filters B and C during purge.