Injector pump fittings leaking

[87 HJ60]

I've have a issue with my 87 HJ60 (2H engine) that happens every so often. I sometimes have a slight leak at the connection between the injector pump output fittings and the lines going to the injectors. It's just two that usually leak. It's the most rearward two pump outputs. Although the leak is very minor; just a slight dribble, it's still a leak. I've tried tightening the fitting. After tightening the leak goes away but returns out of the blue in a few weeks.
Any suggestions on why just these two injector outputs seem to leak and what I can do to fix this leak?

[mac]

There should be a clamp style bracket further up the lines that helps to keep them in place and absorb vibration. Check to see that it's tight.

[roscoFJ73]

Originally Posted by 87 HJ60

Any suggestions on why just these two injector outputs seem to leak and what I can do to fix this leak?

Its not unusual for them to leak there(they are called delivery valves). Possibly they have been opened up before and the gasket was not replaced.
Most diesel mechanics replace them every time
Download the free 2H 12HT manual and go to pg FU36.There are torque specs to consider also