[77newell]

Richard: very clever. The reason I took the different path described below is that I was having a problem related to the flow through the system, not so much the system's ability to hold pressure. Well, that and I didn't have two pressure gauges handy - actually I don't know how I would have proceeded if I had had the gauges handy.

Here is what I did, and really should have done at the start and saved myself time and money. I dumped the left rear airbags, disconnected the tubing connecting the 6-pack to the ping tank, connected the tubing through a valve directly to my portable air compressor and opened the valve. It behaved just like when I operated the raise solenoid valve, that side of the coach would slowly rise about an inch and then stop. The only thing I could figure was that something really weird was happening in the tubing from the 6-pack to the ping tank. I went to Fleetpride and got new tubing and installed it. I did not notice any problems with the connection at the ping tank nor with the tubing I replaced, but it all now works as it is supposed to. I have no clue what was going on with the original tubing that would cause it to restrict only high pressure air and not the air to and from the HCV or the dump valve. I just could not believe the simplest part in the system was the culprit.