Earl's Vapor Guard(TM) fuel system plumbing kits are designed to replace the old fuel system when converting from a carburetor to Electronic Fuel Injection (EFI). The Vapor Guard hose is compatible with modern fuels and is ideal for use with pump gas, race gas, and ethanol blended gasoline. Complete Fuel System Plumbing Kit – Ideal for Use with Most Carburetor to EFI Conversions.