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Thanks for the descriptive information here! I have a Cummins dealer just down the road so I will probably get those parts if they are not too expensive to order.

Sounds like your truck is coming along there. Where did you get your unloader parts? A cummins dealer? Do you have any part #'s from doing your fix for the unloader? Thanks for the response!

Did you find anything out?

OK thanks, Yes it does leak on the outside gaskets and bolts but it is not very much just small bubbles.

Thanks, You do not need to remove anything to get at those rear bolts? Just go to a Cummins dealer to get the unloader and gaskets?

Thanks, a bit more complex than I first thought. But these compressors should be 100% duty cycle being it has CTIS that can use a lot of air!

Well I hooked up an air compressor to the emergency glandhand and brought the wet tank up to 125psi and disconnected the unloader line going into the intake of the engine and air is going out that line to the intake. Then right on 107psi it stops leaking out because the unloader shifts back...

Thanks, no holes anywhere. I shut the ball valves off to the primary and secondary tanks to isolate that as well. I hear no leaks (if any they are very slight) with the truck off. Leaks down to 107 due to the governor telling the comp. to unload. then does not leak down the wet tank when...

Would a bad unloader make the compressor kick on too fast ? Put a pressure gauge in the wet tank to see why it kicks on in 15 sec after it shuts off. My wet tank drains down to 107 from 125 in 15 seconds then stops draining when the compressor kicks on so the unloader is doing somthing here...