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This article brought to you courtesy of Karen Johnston, All About Automotive, Gresham Outlook Insider Automotive Expert

Karen Johnston

The fuel system in today's vehicles can be somewhat complicated. In order to properly maintain the fuel system, it is important to understand the full function of the system.

The function of the vehicle fuel system is to store and supply fuel to the engine cylinders. The engine cylinders are where the fuel is mixed with air, vaporized and burned to produce energy. While a vehicle is running there is a constant circulation of fuel from the fuel tank through the system and back to the fuel tank.

Fuel is stored in the fuel tank and the fuel pump draws fuel from the tank. It then travels through the fuel lines and delivers it through a fuel filter to the fuel injectors (carburetors and throttle body injection were used on older vehicles). It is then delivered to the intake manifold to mix with air and it becomes a fine mist than it is introduced into cylinder for combustion. In direct injection vehicles which is one of the latest designs the fuel is directly injected into the cylinder for combustion. The exhaust gas recirculation system in a vehicle is designed to reduce the cylinder chamber temperature and to reduce nitrogen oxide emissions more commonly known as NOX.

Before the year of 1970 all vehicles that were produced had fuel tanks that vented to the atmosphere, emitting hydrocarbon emissions. After 1970 manufacturer's added a charcoal canister that all fuel tanks would vent through. Then it is directed through lines into the engine to be burned before being released to the atmosphere. This is what we now call the Evaporative Emissions System.

In our next article we will talk a little bit more about this Evaporative Emission System and the best way to maintain your vehicle's fuel system. Happy Motoring!

All About Automotive

139 NW 2nd Street

Gresham, OR 97030

503-465-2926

www.allaboutautomtove.com

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