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Hi Dave,

I don't personally know the answer to your particular questions.  But I'm going to suggest that you check out, and possibly join, the Diesel Detailers discussion board.

http://dieseldetailer.proboards.com/

As the name suggests, the board is dedicated primarily to superdetailing diesels.  It's a great place to ask general and specific questions, find tips and techniques, and check out the work of others.  You could probably get the answers you need on the board, and possibly some suggestions on how to execute the details.  The site mainly focuses on HO scale projects, but only by default.  The founder and most participants model in that scale.  Much like the hobby in general.  But I'm sure much of the information you could find there is applicable across scales.

Check out the following discussions for an example of what you might find.  There is a lot of information there.

http://dieseldetailer.proboard...ta-tricks-techniques

http://dieseldetailer.proboard...read/4118/pipefitter

http://dieseldetailer.proboards.com/thread/3980

Another site to check out belongs to Brian Banna.  He does a lot of superdetailing, and has a lot of great ideas on methods and techniques.  Again, he models primarily in HO scale.  He is also a member of the diesel detailers board so you may see some of his posts there.

http://www.6axlepwr.com/ORIGIN...XLEPWR_WEB_SITE.html

Remember, most of what you see on these two sites is being done in HO scale.  Some of it blows my mind when I think of how hard it is for me to work with some details in O scale.

Anyway, something to consider.  Best of luck finding your answers.

Jim

Dave,

It's been a long time since I've been around a GP9, so, don't quote on this;

Top photo:

I don't ever remember seeing the two things above the left tank. On the crosspipe there is the safety valve on the left, maybe the main supply from the compressor on the right, not sure about the middle pipe.

On the other side, there should be a drain valve at the bottom of each tank.

Bottom photo:

Pipe on the left is an vent or overflow pipe. Run it up through the floor. The one on the right is the fuel gauge. Pipe it into the face of the fuel tank, top & bottom. I can't remember what the crosspipe does near the top.

BTW, fuel sight glasses, while a good thought, over time always got so gummed up and dirty (inside and out) they were pretty much useless.

Hopefully, someone else will come along with better answers.

Hey Mr. Peabody! Where is that "Way Back Machine"?