Hybrid Racing K-Series Swap Standard Fuel System Package (92-00 Civic & 94-01 Integra)FUEL LINESThe Hybrid Racing K Swap fuel line was designed to be a simple pre assembled kit to adapt your stock fuel system to that of a K Series engine. Why do you need a fuel line kit for K Swaps? K Series engines are normally are supplied with return less fuel systems, meaning the fuel pressure regulator is inside of the fuel tank and has only one line leading to the engine. In most cases, the chassis that you plan on installing your K series engine