Thanks for all the quick responses. Below are a few replies:
1) I did try to call Scanguage yesterday and they are closed for the weekend. Just got a recording. I also Google for fault codes. They are supposedly international and not specific to SG. Unfortunately I could not find a list on line. Frankly, if they are "open source" it would be very helpful if the list was on the web for everyone's access.
2) I too now suspect that air is past the filters. Also, I found the Manual purge pump but can not get it to turn ccw. Since it appears to be yellow plastic and there is likely already air in the line down stream I am hesitant to take a pliers to this and possibly damage the system more. Since it appears Coach Net is confident they can get me flat towed to a CAT service center tomorrow, and Since I no longer have access to an rv site for tonight (all in area are full) I have decided to leave well enough alone, sit tight, and have this fixed tomorrow at a service center.
That said this has definitely been a learning experience. Aside from how best to change the fuel filters (thank you all) I've learned not to travel with a near empty water tank (being able to flush is important), and avoid trying to do service items when between stops. Also, if you have an issue and get to a stop or rest area, do not try to leave unless you are pretty certain the problem is fixed. Lastly, maybe avoid fuel from low volume deisel sellers like Circle K and perhaps change your filters more often than the owner's manual says.
Thanks all for the guidance.