I found that had a fuel leak at the inlet to my Solex-carbureted 1965 911's Bendix Fuel Pump which has HBD Products Bendix Fuel Pump Banjo Kit. This is the fitting, which is the inlet. It's a fairly fast drip, too--at least it's a drip, not a stream.

Tightening it didn't solve the problem. Brad Davis at HBD kindly sent me a new fitting and new fiber seal rings, but that didn't solve the problem either. I even changed the fuel line,

Only the banjo fitting itself gets wet--I'm pretty sure fuel isn't leaking where the banjo fitting meets the flexible fuel line.

The mating surfaces look flat; is there anything else to look for?

Would changing the Bendix fuel pump be worth a try?