[924CarreraGTP]

I've never replaced a fuel filter on my 928s. I run Berryman's Chemtool through the injection system. It cleans it up pretty well and if you've ever dropped a carburetor in some Berryman's Chemdip, you will know that it will make a dirty old stained carb look brand spanking new. It will also take paint off of your car, and probably melt your plastic fuel tank. So use it very sparingly. Only a splash for every full tank. If you ever do pull the fuel filter after using Berrymans, don't let the old fuel out of the filter get on your skin because it will chemically burn you good.