What is the location of the fuel filter on a 1986 560SL Jun 21, 2011What is the location of the fuel filter on a 1986 560SL. Also the fuel pump relay? Thank you! - Answered by a verified Mercedes Mechanic Location of fuel pump relay in 560SL. I am baffled, have looked at Alldata and poked around all over the car; can't find the fuel pump relay behind the glovebox, or anywhere else. SOLVED: Location of 560sl fuel filter - Fixya Feb 03, 2019location of 560sl fuel filter - Cars & Trucks question. Hi, it's back by the fuel tank. NOTE: The fuel filter is located underneath the vehicle in the area of the rear suspension. Relieve the fuel system pressure by r emoving the fuel pump fuse from the battery junction box, starting the engine, and allowing the engine to idle until it stalls.; Raise the vehicle.