Okay, here's an update, with photos for those of you that are visual learners like me. 
Opinions welcome here. I removed the manifold today and based on what I see so far, I'm thinking of just replacing the two O rings on the fuel shut off unit with the viton ones I have on hand. But I'm saying that and looking at this leak and wondering how what appears to be a small leak at the fuel shut off can cause such a mess. I'm certainly not opposed to doing more while I have everything apart though - please speak up.
On the EGR unit, I have a replacement O ring for inside the unit, but it looks like a lot of that leak it from above that joint. Maybe the square gasket near the top of the unit is the culprit.
Thanks for your ideas.
__________________
Len
'59 220S Cabriolet-SOLD and living happily in Malta
'83 240D 351,500 miles original owner-SOLD
'88 560SL 41,000 miles - totaled and parted out
https://sites.google.com/site/mercedesstuff/home
'99 E300 turbo 227,500 miles
'03 SLK320 40,000 miles - gave to my daughter
'14 Smart electric coupe 28,500 miles
'14 Smart electric cabriolet 28,500 miles
'15 Smart electric coupe 28,000 miles
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