Sounds typical for a system staying on demand . Like others suggested, make sure your single and double action setting on the aux valves are lined up, no bent or broken roll pins. If that checks out you will need to take the four bolt cover off regulator, relief valve assembly. Note, heavy spring under cover for relief valve so take out two corner bolts and put longer ones in to avoid things flying apart. You will find a screwdriver head orfice with screen . Depending on how many times it has been repaired over the years, the original had a roll pin through the orfice holding a check ball in place. This check ball bounces back and forth and closes the orfice down. As this is a hardend seat they are difficult to re drill to proper size but can be done. It is only .031 so you need wire gauge drills to do so. Screen most likely is collapsed and plugged, you can cut off bottom to clean and wrap it back up again if it is not broken. Now for the fun part. Sometimes you have to make the hole in orfice slightly larger to compensate for the wear on the lands in the control valves, mostly the hitch valve is the problem. I usually go for about .040 to start with, as if you go too large your system will not pressure up when you use the valves. But first off, clean orfice, throw away the ball, and try that with original size. You will need a new gasket and also replace the o-ring on regulator piston and polish it up nicely.
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Today's Featured Article - Chores - by Frank Young. The ceaseless passing of time! It is at once our friend and our enemy. It measures our progress and it makes us old. Like most features of our life, few things are all good or all bad, and most such judgments depend on our own perspective or viewpoint. In our particular hobby, we enjoy the nostalgic return to the days of our youth as we recreate many of the scenes that took place on the family farm that served as the stage for the first few acts of the play that is our live
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