I put a HPOP gauge on my truck today.

[hayjayhorses]

It turns out the HPOP crapped out I had a few hanging HPOP hanging around, so with 907dave’s help I was able to figure out witch one was the 17* pump.
When comparing the bad pump and the pump I decided to use as a replacement I notice the bad pump had some end play (1st when checking the gear bolt torque before I pulled the pump) I could go in and out with the HPOP shaft about 1/16”, the other pumps had no end play that I could tell. Also the bad pump spun quite easy by hand with the gear on it, the good pump was harder to turn.

The weird thing was after I put it all back together, it would not start and only push about 150 psi on the HPOP gauge. So after playing with the wiring and a few IPRs I had laying around I grounded the yellow/red wire (so the IPR would pull hard) I had a friend crank the engine and the HPOP pressure jumped to 2500psi, . Then I undid the ground and the truck stared right up and ran nice

I wonder if the IPR was jammed up and the 12volt was able to free it up.

I took the truck for a drive around the throttle is very snappy, and it sounds just like my ’95Wake up the neighbors. The HPOP pressure was able to maintain 2600-2800 psi at WOT from 1800-3000 rpm. I noticed the boost would only go to 12 psi and the EGT was lower also. I wont know what I am dealing with until I hook up to my hay trailer tomorrow and head west.

It did idle like a big cammed gasser once it warmed up, and also idles at 900-950 rpm at a stop in drive

I will post my finding after I get home from NY with my load of hay tomorrow.

Thanks again Dave and Bill for the help.