The thing is, the fuel pump is actually under the passenger side of the rear bench seat and the sending unit is on the driver's side under the bench seat. The electricals and lines run from the sending unit over to the pump and to replace the sending unit, on the left side, you have to pull the pump, under the right side and disconnect. The sending unit is bad on this one but at 20 years old, I said I am replacing both or not at all and the lines, feed and return, from the top of the sending unit go down to the fuel filter and then on the other side of the filter, 2 lines go to the engine compartment. None of it has ever been changed. I said, pump, sending unit, both lines to the filter and the filter, or not at all. Lines are unavailable at RA but found them at ebay, NOS, and the pump/sending units are available at RA, Delphi/Bosch, and the filter, genuine MB, is at ebay. Parts and shipping is all just under $1000.