Detroit 12.7 fuel pressure

Is that bobtail or dragging a loaded trailer? I had one of my units rebuilt to a stock 430 program couple years back; pushed 28/30 lbs depending on air temp when loaded on a hill.

Pressurize your CAC n see if it holds pressure. Swap hump boots and clamps. Be the first couple things I’d do.

 

That's any way u want it went up wolf creek pass in Colorado weighing 60ish 14 pounds the whole way

 

And planning on making me something to do that just gotta find the time gonna try getting ac fixed tomorrow and fix brake lines that are rubbing the hood.... ugh