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The military uses DOT 5 , you probably need to drain (or suck some out of the MC) some brake fluid and test it Brake fluid -how to tell which kind you have DOT 3 or DOT 5

If it doesn't run with it all the way out you still have a issue that needs to be addressed . it sounds like the fuel solenoid is going bad . https://www.eriksmilitarysurplus.com/fucova24vofo.html

Welcome to SS , the site likes you to post pictures direct to the site as links go dead. This thread explains how to link them ; How to post pictures - a tutorial

Air is easy you can hear it most of the time.

Except that thread is on 10,000lbs Deuce winches.

The one I have is seized with cable on it .

The coupler will be a weal point .

I would think almost doubling the PSI on winch may tend to break things.

There some TM''s that cover Macks in post #11 of this thread. Mack Fuel system TM???

Some home brew ideas here. Insane home Water/meth injection...

Bypass m923 fuel pump?TM9-2320-272-10.pdf TM9-2320-272-10 Operations manual for the M939 series trucks. Sept 2004

LMC shows them also . The 2nd link in post #67 is the correct part per the parts TM. LMC. http://www.lmctruck.com/icatalog/csb/full.aspx?Page=51

This place lists them might want to call and see if they still have them. http://www.flmv.net/FLMV-CUCV.htm And here is a place in germany with them. https://www.us-army-military-shop.de/product_info.php?language=en&products_id=4093

Cooked battery smell = rotten eggs

This is the technical manual for the winch. TM9-3830-501.pdf TM9-3830-501 Repair and Maintenance Gar Wood Winch w/ level winder Front 20,000# and Rear 45,000#.

It not really a sealed system the transmission is vented through the air intake most likely ( not real familiar with the venting on m151's) . But It vents some where or it would blow seals . So in a humid climate moisture can get in through the vent.

Even if it was full it is likely all the lube drained off the bearings after 10 years , so it could likely be seized bearings .

It should have a data tag on it.

That is the second link I posted in Post #2.

That the air dryer , when was the last time it was serviced ? M939/LMTV/FMTV Air dryer replacements/upgrades M923a2 Air Dryer rebuild Service Your Air Dryer Bottom of air dryer leaking. In parking lot