I didn't want to pick on Evo but it's true. They tend to blow a lot of worn crud as they break in. It seems to be the back plate for the most part but most engines when new or old do it. It's just a wear in or out process. I even have engines without any baffel and you can see the pressure line getting a little gray. Nothing to worry about but Evo seems to blow a lot more gray mater then other brands. It goes away with use as the engine breaks in. Other then a burnt out plug every now and then it's no big deal. You can use your pump to suck out the bottom of the tank. A filter tends to lower the tank pressure and you can have other problems then. A good clunck filter is a pretty good idea too, keeps all the nasty from going back through the engine.