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Fuel systems are fairly basic. Whether it is carbureted or fuel injected, the delivery system is comprised of a fuel pump (mechanical or electrical), filtering media of some sort, delivery lines, and a fuel pressure regulator to keep the system’s pressure in check. Today’s fuel injection fuel delivery systems can get a bit more complicated as the OEs try to find the best fuel economy, driveability, and performance while also keeping costs in line. One way this is accomplished is with a “returnless” fuel system. The typical returnless system uses a fuel rail pressure sensor, along with other typical engine sensors, to work with the ECM and a fuel pump controlled by a fuel pump driver module. What all this techno-speak means is that a computer varies the voltage to the fuel pump to control the fuel pressure and volume. As the computer sees an increased throttle input, the fuel pump voltage is increased to deliver the increased fuel needed to the engine.

Photo Gallery: Electric Fuel Pump System Install – Fueled Up – Modified Mustangs & Fords Magazine

Photo Gallery: Electric Fuel Pump System Install – Fueled Up – Modified Mustangs & Fords Magazine

Many people think fuel injection is akin to the dark arts, like Voodoo or something, but it’s not really that scary if you understand the basics of how an electronic fuel injection (EFI) system works. Without sounding like geeks in white lab coats, EFI is, essentially, a more precise way to control the fuel requirements of an engine. Where a carburetor is sized to an engine by its cfm rating and certain sized fuel jets are used to control fuel flow to the engine, EFI does the same thing via the cfm rating of its inlet, called a throttle body, and by the EFI’s fuel injectors. Think of the injectors as an electronic version of a carb jet, only they can vary in size, making the EFI system more precise for the engine’s fuel demands.

Photo Gallery: EFI Buyer’s Guide – Fueling Around – Modified Mustangs & Fords Magazine

Photo Gallery: EFI Buyer’s Guide – Fueling Around – Modified Mustangs & Fords Magazine