Starbrite Star-Tron Fuel Treatment Starbrites StarTron fuel system additive resolves most fuel-related engine issues. StarTron is a multi-functional additive that allows marine engines to start easily and run smoothly, even when using ethanol-blended fuel to after sitting idle for months. Star Tron effectively removes performance robbing gum and varnish deposits from the fuel system to increase fuel economy. The treatment modifies how fuel is burned, resulting in a more complete and uniform comb