THE FUEL SYSTEM
The fuel system pumps fuel from the tank and mixes it with air so that the proper air/fuel mixture can flow into the cylinders (because to make the little explosion to work it needs oxygen) then it give out a little spark. Fuel is delivered in three common ways: carburetion, port fuel injection and direct fuel injection.
• In carburetion, a mechanism called a carburetor mixes fuel into air as the air flows into the engine.
• In a fuel-injected engine, the right amount of fuel is injected individually into each cylinder either right above the intake valve (port fuel injection) or directly into the cylinder (direct fuel injection).
I’ll be discussing the fuel injected engine.
As new engines were designed, ‘throttle body fuel injection’ was replaced by multi-port fuel injection (also known as port, multi-point or sequential fuel injection). These systems have a fuel injector to infuse fuel to each cylinder; it’s usually positioned so that they spray right at the......
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