I replaced the poly hose line with a cool orange air hose. I also used some fancy air hose connections and a ball valve.
I swapped out one of my sandpiper pumps and I actually have less air leaking out, but I could fix 3/4 of the problems. The top brass fitting needed new tape to seal it from leaking (the top threaded piece has a crack). The diaphragm is leaking but I tightened it and could not get it to stop. Last problem was the air connector which was leaking so I replaced the part.