Where is the fuel pump on a 1989 Mercedes sl 560?

The fuel pump is just behind the rear axle and in front of the fuel tank. There are two cylinders, one is larger than the other...that is the fuel filter, the other unit is the fuel pump. If you plan on removing it, be very careful not to "ground" your tools, it could cause a spark, and ignite the fuel that will be seeping out of the loose fuel lines. I would suggest to disconnect the battery cable to avoid any problems. I would also suggest that you replace the fuel filter at the same time...it's easier to do both at the same time. As a matter of fact, a fuel filter that hasn't been replaced in a long time can contribute to a bad fuel flow.