Fuel System

The function of the fuel system within your car is to store and supply the fuel to the cylinder chambers. Here, it is vaporized and burned to produce the energy your car needs to run.

Basically, your fuel system consists of a fuel tank in which the gasoline or diesel is stored, a fuel pump that draws the fuel through the fuel lines to a carburetor or fuel injector (which ever your vehicle employs) and delivered for combustion. If any of these components fails, your car could experience serious issues, including no longer running at all.


Is a complex blend of carbon and hydrogen compounds. Additives are then added to improve performance. All gasoline is basically the same, but no two blends are identical. The two most important features of gasoline are volatility and resistance to knock (octane). Volatility is a measurement of how easy the fuel vaporizes. If the gasoline does not vaporize completely, it will not burn properly (liquid fuel will not burn).


Steel lines and flexible hoses carry the fuel from the tank to the engine. When servicing or replacing the steel lines, copper or aluminum must never be used. Steel lines must be replaced with steel lines. When replacing flexible rubber hoses, proper hose must be used. Ordinary rubber such as used in vacuum or water hose will soften and deteriorate. Be careful to route all hoses away from the exhaust system.


Two types of fuel pumps are used in automobiles, mechanical and electric. All fuel injected cars today use electric fuel pumps, while most carbureted cars use mechanical fuel pumps. Mechanical fuel pumps are diaphragm pumps, mounted on the engine. Many cars today, the fuel pumps are mounted inside the fuel tanks. Electric fuel pumps can operate on pressures of 30-40 psi. Current is supplied to the pump immediately when the key is turned. This allows for constant pressure on the system for immediate starting. Electric fuel pumps can be either low pressure or high pressure. Fuel pumps are rated by pressure and volume. When checking fuel pump operation, both specifications must be checked and met.


Most vehicles have a single tank located in the rear of the vehicle. All tanks have a fuel filter pipe, a fuel outlet line to the engine and a vent system. All catalytic converter cars are equipped with a filter pipe restrictor so that leaded fuel, which is dispensed from a thicker nozzle, cannot be introduced into the fuel system. All fuel tanks must be vented.


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