The one you've marked on the right is the banjo fitting on the input side of the pump. It's a hollow bolt, with one copper washer on either side of the banjo itself.
The one on the left is one of the banjo fittings on the output side of the pump, so loosening that would push high pressure diesel out while the pump is running. Be careful with the high pressure side of things, especially with diesel.
I've only worked on the input side of my pump's fuel lines, so look for better advice from someone who has done the injector side before. But check the parts diagrams at Messicks and look for the washers (part #37 on the larger right-hand fitting, part #53 on the smaller left hand fitting, two washers per banjo) they are cheap and likely available locally from e.g. NAPA. With the engine and fuel shut off, you can R&R these connections with new washers but you'll have to bleed the fuel system after that to get the air out. Might not want to start a project like that until you finish the foundation though. Bleeding the system isn't too hard but I found it stressful the first time I did it as it seemed to take more cranking than I thought it would. Better to probably get all of the leaks (tank valve, etc.) all done once and bleed once. Put new fuel filters in place while you're at it and take time to R&R the fuel filter head and gaskets as well, or just replace it if it's in bad shape. Those parts are also readily available and not too much money.
In the meantime, your loosen and re-snug sounds like it may have helped enough to get you through the current project.
Hope this helps -
Greg
This post was edited by Greg Wolodkin at 19:28:08 11/19/12.
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