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Yas, I like the last idea. Keep isolating circuits and record the pressure drop for each. I will report later... Thanks.

Oh, and trailer park valve also eliminated. Not planning on ever tawing air brake trailer...

UPDATE: ... got busy but a the leak fixed... sort off. Line fix was remarkably easy. Thank you General! Replaced both check valves and new connecting line since the oem was too short. Before lost pressure in minutes due to the obvious line pinhole. Now, however, still loosing pressure but...

Guess I'm replacing that line. Uffff. Life with LMTV. I'll post an update when done. Thanks for all the good info.

Thanks. I just did that, removed the short line and figure out the fitting swap. NAPA. good advise. as to the pinhole, I think it is a break line or could be CTIS line. It is the same as the 1/2" pri-tank feed line. I need to free them out and trace to varify. It is pressure line and...

Also, on the reroute subject: on the wet tank the line to the e-gl is smaller then the once connecting wet tank with the pri-tank. I will need new fittings to make this work. Off hand, do you know what thread goes into the wet tank? I'd replace it with a straight fitting for better direction...

UPDATE: so this was NOT were it was leaking from! I was misslead by tagging on the line as it was causing the sound change. The leak is from farther forward on the bigger line (do not yet know what line it is) thru a pinhole. Do I need to replace the line, or can I cut it here and join...

I replaced the front e-gh earlier this year with this: It does not appear to be the same as the one on the pri-tank....?

General/Rommar, than you for great direction. The line switch makes total sense. Now I understand why they call it the wet tank too! was my next question. I'll get the check valves. To make sure: KN23080. Right?

Thanks Rommar. I can fix this leak, but sounds like I have more issues. Most likely bad check valves. Already replace one on the glad hand. How would you go about diagnosing it? Just replace all the check valves?

I got the schematic, but no clear to me where is that junction and that line.

I have 1998 M1078 A0 that Im working on to get ready for off-grid camper project.... discovered air leak from this junction (see photos). I wonder if any one can ID what this line is and where is it going to. It is draining my air while parked. This is a view from under, looking over the front...

Guess mine is III

Thanks Mike, Delta Lock is what I meant for spacer. I'll be ordering a set around March.

Thanks, good to know. I'll be ordering a set of ECOs soon. Hope it'll be with spacers in place of the split ring.

Great thread! read all 26 pages. some deviations, if short, where helpful. Thanks for taking the longer off topic elsware. Quick question: any one have the hub protectors, oem or from Midwest, to tell if they fit after the ECO mod?

Thanks! Guess I need to figure out what do I have. Its 7/1998 manufacturing date, so it should have WTECH III... where do I look?

Question: does M1078 A0 have or can have exhaust break?

Where did you get this kit from? I need to replace the horrible A0 door limiter.

After extensive search, that plug is only available at well over $150.... if at all. My conclusion is that I will remove the socket from the dushboard and utilize the leads that I want directly, w/o socket plug. Of the 54 pins, only 34 are used according to the schematic, and only handfull I...