Hmmmmm, does the fuel supply suppose to have plain banjo bolt or one with a ball bearing in the middle, that is my question. The pics that I see of the non-adjustable fuel pressure relief valve isn't in the same area, i/p engine side, on my car, it is on the opposite side, fender side. I wanted to see here whoever has a 1984 or 1985 300d California model with OX-cat if their setup was like mine. If it isn't, then the previous owner or mechanic installed the pressure relief valve in the wrong location.