2.25 L Diesel - Leaking Fuel Pump - CAV DPA

[hermanthegerman]

The CAV DPA diesel pump on my trusty 1983 SWB RHD 2.25 Diesel started leaking. There is quite a bit of fuel coming out and making a small puddle below the car. The leak seems to originate at the banjo fitting at the top of the pump, then run along the seam of the pump right below the fitting and then drop to the ground. Thing is that I did all the usual fixes to the banjo fitting (cleaning contact surfaces, using new washers), but the leak persists. Could is actually come from the seam between the top and the bottom part of the housing? Is there any kind of seal that could have gone bad? Any leads are really appreciated. I found the attached photo on the web. Someone had the exact same problem ten years ago, but the related thread only contained some guesswork but never came to a conclusion. Any thoughts? Thanks!