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The Short Answer: An engine runs rich when the fuel mixture holds too much fuel for the air entering the combustion chamber. It runs lean when there is too little fuel for that air. For gasoline, the balanced fuel ratio is about 14.7:1, so a rich condition falls below that number and a lean condition…

The carburetor came off, the EFI throttle body went on, and the old pump suddenly can’t keep up. That stock mechanical fuel pump fed your carb at roughly 6 to 8 psi, which is fine for a Holley but nowhere near what fuel injection asks for. Most EFI systems want steady high pressure around 58…

The Short Answer: Your ignition system controls when and how the spark fires in each cylinder. FiTech EFI systems work with points, electronic ignition, and HEI distributors, but electronic ignition delivers a cleaner signal to the ECU and requires less maintenance. Beyond that, the key decisions are coil selection, spark plug gap, and whether you…

The Short Answer: The best EFI system for a small block Chevy depends on your engine, your cam, and what you’re building it to do. For most SBC builds, a self-tuning throttle body EFI system is the fastest and most practical path from carburetor to fuel injection. Builders chasing per-cylinder precision or higher horsepower have…

The Short Answer: There are several types of fuel injection systems, but the four main ones are throttle body injection (TBI), multi-point fuel injection (MPFI), sequential fuel injection (SFI), and direct injection. Each one delivers fuel differently, and the right choice depends on your build. For most classic car and hot rod EFI conversions, throttle…

The Short Answer: An ECU (electronic control unit) is the brain of your EFI system. It reads sensor data in real time and controls fuel injection, ignition timing, and idle speed to keep your engine running right across every operating condition. You hear the term ECU a lot when you start looking into EFI systems,…

The Short Answer: Most EFI problems come down to a handful of common causes: clogged or faulty fuel injectors, fuel pressure issues, bad sensor readings, a low voltage or points style ignition system, or worn spark plugs. The fix is usually straightforward once you know where to look. If your EFI system was running fine…

The Short Answer: EFI tuning is the process of setting up and adjusting how your ECU delivers fuel and controls ignition timing across every operating condition. Self-tuning systems like FiTech handle most of this automatically using sensor feedback, but you’re still responsible for the baseline: idle speed, throttle blade position, and cold start setup.  If…

The Short Answer: An EFI fuel system needs to deliver fuel at higher pressure and more consistent flow than a carburetor setup. At minimum, you need an electric fuel pump capable of ~58 PSI, EFI-rated fuel lines, a fuel pressure regulator, proper filtration, and a fuel tank that can support the system. If you just…

The Short Answer: Electronic fuel injection (EFI) is a fuel delivery system that uses sensors, an engine control unit (ECU), and fuel injectors to meter the exact amount of fuel your engine needs at any given moment. EFI systems read real-time data from your engine and adjust the air/fuel ratio automatically. The result is better…