Is a special tool required for disconnecting the fuel filter lines on a ML 320? If so, who offers the tool?

As far as I know only BENZ (dealer) # 163-589-00-37-00($65), but it's simple to fabricate one that will work. Use coat-hanger or welding rod & make a 5" U with inward 1/4" points to release the plastic lines. Only the plastic buttons have to be pushed in for the line to be removed.