Got a MF-240 with 3 cyl Perkins diesel. About a year ago I replaced seals on throttle and shut off shafts now have a new leak. Its dripping fuel off what I think is a banjo bolt on bottom of pump onto oil filter below it. Thought it was coming from inspection cover to the left but after cleaning it up a bit can see it leaking above the banjo bolt, or what I think is banjo bolt. Have read they use copper and soft iron crush washers, anyone know which it is? Figured I would try and replace them first.