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Funny thing, the low pressure setup wasn't really that dirty. A little grime in there (probably from the sticking unloader valve). Otherwise it was in good shape. I just pulled it apart, wiped it all down, inspected for cracks in the rubber, and put back together. Hardest part was laying on my...

And I pulled that apart as well. Cleaned it up, made sure the diaphragm was in good shape, put back together, tested with air pressure. All works good now! You should see the SLUDGE that is in the air tanks! I guess 700 miles of constantly running will blow a bit of oil into the tanks because...

Not much to talk about. Two bolts with washers hold the setup down. And undo the air line. There are a few things that come out, have o rings on them, and have washers between the parts. Was that vague enough? Honestly though, pull it apart and just clean up the rusty stuff. If the O-rings are...

Luck based on a guess on the pictures of the engine, and the spedo reading 26 miles and only 7 hours.

Yeah, you got that one right! The unloader valve did need work though.

Well, just got back in from completely pulling the unloader valve apart, cleaning it up, sanding down some parts, and putting it back together. Then, guess what, I traced the 'final' (I hope anyways), air leak to.... the low air pressure switch. Is that the same part that is used on the deuce?

Thanks, will do.

My paperwork shows the defects found on the truck when it was inspected for 'release'. It lists it as 'Unloader valve leaking - C2'. And cost of parts as $3.43, and 2 hours of labor to repair (not replace). So it sounds like it either needs a little work, or it's a gasket issue maybe.

My unloader valve is bad. I get constant bleed off of air from behind the dash. To be expected there, but I am unsure of where the unloader valve IS on the cummins motor. I know where it is on the multi fuel. Seen a few posts on that in the deuce sections. But the air compressor on the 250...