D333 fuel transfer/lift pump

Hi Guys
Probably been through this one 1000 times before so might be an easy one hopefully. Unfortunately no manuals were supplied with the unit when we bought it so here I am.
D333 23C698 4.75" bore powered generator. Works beautiful, took it up to 90-95% load going perfect clean exhaust too. Anyway noticed the drain tube originating from the fuel pump was dripping/running diesel so I guess it's time to pull something apart, i'm guessing going to need to replace some seals possibly?
See drain tube in question:
[attachment=57929]d3331.jpg[/attachment]
[attachment=57930]d333.jpg[/attachment]

Thanks

Regards

Yes, leaking from the seal cavity between the two 4S7756 seals and you will also need a 7S2374 gasket. Plus a few more...