Hi, i am interested to know the major components of the fuel system of a car. I know, these are the major ones: Fuel Tank, Fuel Pump, Fuel Filter, Injector Valve, Return Lines but what i am interested is in the fuel system for (1) a single cylinder engine, (2) no carburetor (instead, i am looking for the injector valve to be electronically controlled), and (3) with the fuel tank above the engine it must be kept in mind that my aim is to make the engine consume as little fuel as possible for a given (required) output my specific questions: 1. If we have the tank above the engine (allowing the fuel to be gravity-fed), would the system not need the fuel pump? 2. I have the option of pressurizing the fuel tank to up to 5 bars. How can pressurized fuel (in tank) help me? Is the combination of this pressure + gravity-feeding sufficient reason not to have a fuel pump? 3. Can i expect the system's fuel consumption to be better (meaner) than with a carburetor? 4. Does the system (jpeg attached) look ok?