Step by step instructions for replacing the fuel filter on a W210 and W220 Mercedes Benz (specifically E320, S430, and S500). However, as with many MB parts, the same fuel filter is used on many other models; and therefore, the procedure is the same. Not changing the fuel filter as a maintenance item will result in fuel trim issues and other engine problems. The fuel pump is right next to the filter and is connected to fewer hoses. So, you can use the same process to also change your fuel pump. The only additional step would be to unplug and re-plug the electric connector.