Nice work, preston, keep it up!

I'd be very interested in what you found out about the fuel pressure regulator. A few pictures would also help.

I have just stripped my tank of all internal parts, and I am about to treat some mild rust problems in the tank with the old vinegar, baking soda and WD-40 trick. Hopefully that will remove most of it, and I will be sure to maintain a full tank from this point forward. I will be replacing all hoses, the fuel filter (with NAPA brand) and a general cleanup of everything else.

Parts for this bike are challenging. What replacement fuel regulator was finally used?

'91 907IE

I did cut the regulator in half and found it to be full of sediment and varnish. I think this bike must have sat for quite sometime before I purchased it. The filter that was in it had partially disolved internally and I think this was the beginning of the problems. I have a NAPA filter in it now, but dont remember pt#. I used the POR 15 treatment kit which consisted of some marine cleaner and an acid. It cleaned the tank up very well. It just requires a continuous rotation of the tank while it is in there. The POR 15 completely sealed the tank. I let it dry for 4 days and then inspected with a mirror before putting any fuel in it. I have had no problems since performing this.I also removed the fuel injectors and had them serviced at this time. The screen in one of them was partially clogged. That was $50, but probably improved performance and eliminated one more problem. Just my opinnion, but I think the POR 15 is a good thing for older bikes that may not be ridden very much. I used it on a 1979 Honda CBX, and a 73 Norton Commando that I purchased and both had the beginnings of rust in the tank.
PS . I used a fuel regulator for an 83 BMW K bike. It is identical and is working fine.

Preston