PureFlow® Technologies, Inc. addresses diesel engine efficiency and peak performance on the fuel side from the fuel tank to the tip of the injector. Removing entrained air and fuel vapor from the fuel flow to the engine with the AirDog® FPII 4G, Champ, & Champ II is not enough if the internal conditions of the fuel system components are such to allow vapor to reform in the injector itself. Specifically, if the fuel pressure/ flow to the injector, even with entrained air and vapor removed, is not sufficient to totally fill the injector barrel on the up stroke of the plunger, a void or low pressure will form that allows vapor to reform within the injector. The resulting “injector lag”, is just another name for “retarded injection timing”, and leave the engine with increased fuel consumption, lost power, and increased exhaust emissions. To overcome these concerns, upgrading the Detroit Series 60 secondary fuel system is simple with the AirDog® Detroit Upgrade Kit. The Detroit Series 60 engine model years 2003-2009 utilize “FOR SEAL” fittings with steel lines on the high pressure side of the transfer pump. These fittings have small passageways and are restrictive to the fuel flow to the engine. To maximize the efficiency of the engine, it is necessary to replace the restrictive fuel fittings and lines with larger and less restrictive lines and fittings. These fittings and #8 DOT approved fuel lines are supplied with the AirDog® installation kit.