809 series injector fuel pump

my m819 has come up with a fuel drip from the front of the injector pump, the question is

if i keep running the truck will put fuel in my engine oil though the air compresser or does the air compresser have a seal on the acressery drive side?

how hard is it to change the shaft seal or o ring

The fuel pump has a pair of shaft seals with the lips facing opposite directions, one toward the compressor and crankcase oil, and the other toward the pump and diesel fuel. There is a weep hole between the two to try and catch any leaks and render them obvious. We got a $130 kit from our local injector shop that had everything including a new shaft for the seal wear areas.

I think this is the record for the longest interval between a question being asked, and an answer being posted...

I'm amused.