I had to search through the MB factory service manuals online. Apparently where the fuel pressure relieve valve is suppose to go, I/P engine side, there is just a banjo union. Where the banjo union is suppose to go, I/P fender side, there is the fuel pressure relief valve. Whoever worked on the car before I got it must have put this in the wrong order. So basically, there wasn't a fuel pressure relief valve there. I will flip flop them into the correct location.