OK, A little more help please. With the new engine probably going in mid-June timeframe, I'd like to polish my fuel system. I have talked to one company who provides this service in which they come to my house and perform this service. They apparently access the fuel tank through the sender hole and scrub the tank as well as polish the fuel with their pump/filter system, they also add a biocide. They complete all this in 3 hours and charge $375. Any body got a better/cheaper idea which is effective?