As recommended by a forum member earlier; Located, disassembled and rebuilt the leaking shut off valve key with (2) #7 and (1) #5 O-Rings. Then closed the valve and ran the Aux pump and waited until it successfully shut off after ~15 minutes (cannot report pressure reading when it tripped as I did not plumb in a gauge yet) thus assume the square D regulator must be working OK. I then opened the valve, turned the Aux pump back on and waited...no luck, it ran for over 45 minutes before I decided to turn it off. I then started the engine to fill the F and R air tanks per the dash gauges and retried the Aux compressor with same results. Guess I need to keep searching for another leak somewhere down stream.
Did you replace/fix the slide bladder leak you mentioned earlier?
A leaking slide bladder will cause the aux compressor to run continuously.
Been working on the aux pump issue on and off due to other pressing matters. The slide bladder still loses air when left to sit for awhile. Starting the engine pump or the aux pump inflates OK pretty quick. Still no luck searching for the leak causing the air loss in the bladder.
However, I see what looks like an available port on what I believe is a pressure regulator on the aux pump (light gray cap)....can someone tell me if it's OK to screw in a vac pressure gauge into this port (I have an extra gauge that came with the regulators when I replaced them for the front step). Here's a pic of the aux pump on my bench with a view of a regulator (light gray cap) and the port to its left with a plug in it. Also, once I install the vac pressure gauge, what pressure should it read when operating properly?
Nice work bench or is that the dining room table?
You don't need a vacuum gage. the pump puts out about 110 psi. the regulator at the bladder manifold limits pressure in the bladder to about 15 psi. when you turn the room key on pressurized air moves across a venture vent at the bladder manifold causing a low pressure at the venturi vent sucking air out of the bladder. When you turn the key off, the air stops moving across the venturi vent and air inflates the room seal.