I would check what has been stated. If you do not understand, then see if a mobile guy can come out. You need to look at the air dryer, governor and the compressor and unloader. It is one of those unless you have a blown hose but that would have to be from he compressor to the tanks. If it was just a tank you would hear it leaking. If you start up can you hear any air is the first thing. Then you can go to the governor. Go in the back and look for it, it is a D2 and take the black cap off and turn the screw all the way one way and then back the same number of turns and then do it the other way. That might get it to work. If not then you need to look at he air dryer. I think with the age of your unit, it is a good possibllity that it is the Air dryer. A mobile guy can bypass it though I am thinking of getting the stuff to do mine and a plug too as you have to plug off one line as well. Depending on which dryer you have, they may not make it any longer and you will have to get a reman or a new version and have it plumbed in.
