I have a 1987 560Sl with 173,000 miles. Less than a year ago I changed the filter, pump and accumulator. Jack up the right rear and remove the wheel so you have plenty of room to work. Lay out the tools you need and the new parts where you can reach them from under the car. The only suprise was when I removed the fuel line from the tank to the pump. Be prepared to put a finger oner the end of the hose ASAP. Expect to spend approximately 2 hours. The only major fuel leak was the one described above. Also, disconect the battery before you start.