how to change the fuel filter on a ML430?

Answer 1

You do not need to remove the back seat. You have to remove the back wheel and the plastic innner wheel well though. It may be hard to manuver in the small space were the filter is if you have large hands. You will need to depress the tabs on the lines where they connect to the filter. There are 2 of them on each line that are 180 degrees from each other. Chances are you have new lines that came with the filter. They made a change in the filter to a longer one and the lines need to be used to fit it.
Make sure you connect the lines to the filter before setting it in place.
After filter is in place. Turn the ignition on and off about 6 times to prime the new filter.
If you don't and try to start it, it will trip an engine code. The code is no big deal if you do trip it but you need a special tool to reset the computer.