Oil Leak, CM 871, up behind fuel pump

[Waterloo]

I was getting ready to take off and got under the hood, started the motor and heard a ticking sound? Ticking sound stopped when the air compressor finished its job. Anyways, I popped the hood and discovered the side of the block on the driver's side is wet with oil or diesel, I honestly cannot tell, looks like oil, but not 100%. BUT my oil is low. Near as I can tell, without tearing everything apart, the leak is up behind the fuel actuators. I saw a 90* elbow coming out of the block with a line on it, and it is wet around it. What is behind the fuel actuators/fuel pump assembly that could be leaking oil?

Also, I checked the fuel filter, it is dry, as I almost thought it was diesel, but then again it could be. Hard to tell 100%. Winter grime and all, weather has been crap up here.

I am heading over to Quickserve right now...