So I went back out again today to collect a bit more info. So I put the
pressure gauge on the output of the combination valve. I got a consistent
reading of 500psi.
My procedure was engine running, pump 5 times and hold for 1 min. Gauge
went to 500 with every press and held at 500 without fluctuation. When I
did this same procedure on the MC got 800-900psi. So do I have a clog in
the combination valve?