I had same problem...was dirt in the purge valve
Hi -
I had nearly identical symptoms and could not find a leak anywhere. I replaced the governor and blow off valve and still no joy.
After taking everything apart a second time, there was a little bit of 'crud' (for lack of a better term) in the purge valve where the spring holds the seal closed. If you take off the black little canister where the heater is and then look inside, you will see where there is a small metal plate with a rubber seal on one side and the spring contacts the metal plate to hold it in place. The foreign matter was preventing the seal from closing completely, and thus the continuous purging. In my case, the purge also lasted longer - it wasn't a short burst (as is normal) but was longer and you could see the pressure gauge drop while open/exhausting air.
I'm not at all sure that this is the same problem that you are having, but it is worth checking. I was at wit's end searching for a nonexistent leak when I decided to sort of "start over" and then found the problem. Has worked perfectly since.
Just a thought?
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John S
2008 Monaco Dynasty Diamond IV
Cummins ISL 425 8.9L
Towing 2015 Ford CMax Energi
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