I've been burrowing around inside the engine trying to pinpoint a diesel leak and I'm fairly sure it's coming from a connector on the back of the diesel pump, directly above the fuel adjustment screw.
Here's a picture (taken with thanks from sibainmud in this post viewtopic.php?t=35306) with the connector arrowed up:

Can anybody tell me what this connector is, and whether there is a washer or seal in there that I can get at? It's hard to get a decent visual on it and I'm going largely by feel. Is this a spot that is known to leak or is there something else in the vicinity that is more likely to be the culprit? It looks like I'll to remove a lot more wiring, accelerator linkage etc to get a better look at it so I'm looking for any thoughts before I dive into to it. The bolt itself (lock nut?) was not fully tight, and I was able to get a wrench on it and tighten it up, but the leak is still there.