I have a 1988 240DL. I am going to replace some fuel delivery parts to try and cure the hard starting and loud rattle I am getting out of my fuel pump. My first questions center around the fuel filter and check valve. While working on my rear brakes I spotted the fuel filter near the left rear tire. What is the best way to get working access to the filter? I am assuming I must get the car up high on jack stands. Is that correct? Second what are the directions for replacing the filter? The FAQ directions do not seem to be for the 240. Second set of questions are about the fuel check valve. Where is it located and what do I need to do to replace it? What are the size of the flare nut wrenchs I will need to do this work? I will also be replacing the pre-pump so any advice on that will also be appreciated! Thanks in advance!