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Priority/protection valve. notice post # 28 in this link. http://www.steelsoldiers.com/showthread.php?100355-Air-system-relief-valve-opening-on-M925-Frozen-air-lines-valves&highlight=desiccant+filter

I think every set if HF tow lights I have bought, were wired incorrectly.

We have the TMs available in our TM section. Look at the top header bar. You own an M939 series truck. I suggest you right click on all the manuals for your truck and save them on your own computer. Then you can open them fast and easy. They are searchable(by key words).

Tm 9-2320-272-24-1

You may want to move the tow bar/shackle mounts forward in case you ever need to tow your truck.

Have you tried giving Carnac just your serial number(4G6261) yet? That number should have stayed with the truck all along (maybe).

Just the year, I think we will have to guess at the manufacturer.

And here you can see the newer style inner fenders Notice the louvered surface is angled and there is no room on top to set a cup of water(or tea).

You can see in this picture, the large flat surface on the driver side inner fender. This is a gas truck original.

Oh, and you have a "D" turbo. Again, the engine data tag has nothing to do with which turbo is installed.

I can see that your inner fenders are the older gas engine style. If you can set a cup of water on the innerfenderwell, then it is the old style. The old style are a 90 degree angle, with a flat top. The newer style is angled and you can not set a cup on it.

Are you saying the smoke clears after it has started? The smell of unburnt fuel at startup, is a good indicator that you have 1 or more bad glow plugs.

You may need to take your IP to a professional shop. Do you drive this truck daily or are you stranded on the side of the road? If not, do not use HELP, in your thread title, we reserve that for real emergencies on this site. Where did you get your fuel adjustment information?

The 1D on the motor plate does not indicate which turbo you have. It designates an engine revision. Your motor was part of a 1986 contract. It was most likely to have been manufactured in 1986 or 7. This would indicate that your truck was rebuilt after 1986. Your dash has an older gauge...

Let only your imagination and budget stop you.

You can use the troubleshooting section of the intermediate(-24) TM. It has step by step instructions.

Have you looked well on the passenger side as well? You may have an older Studebaker truck with it on the passenger side. If not, then you may have an oddly stamped(drivers side stamped) older truck. Do you have a turbo? Can we see a few pictures of your dash, and truck? Can you look at the...

Do you have clean fuel and filters? You may need to increase the maximum fuel rate. You'll need a pyrometer to safely increase it. You can use only a boost gauge, but it is not the best way. 10-12 max boost at load should be safe. This method is covered in the LDS engine TM.

I moved your thread into the correct forum.

Your truck is an 939 series truck (not a 900 series).