Quote:
Originally Posted by matthewdenny
... the pressure builds in our high pressure tanks, gets to 65 psi, holds there for ~20 seconds ...
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That sounds like your main regulator is not plumbed correctly.
On the regulator there is an arrow on one of the ports. The high pressure tubing must go into the port that is at the tail end of the arrow, and only that port. The other three ports are kept at working pressure ~60psi.