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Fuel pump

For the machine at a filling station used to pump fuel into vehicles, see Gasoline pump.
Not to be confused with carburetor or fuel injection.
Electric fuel pump (silver), along with the fuel strainer (dark brown) and fuel level sensor (light brown circular object)
Mechanical fuel pump in a 1980s Saab 90
High-pressure fuel pump on a Yanmar 2GM20 marine diesel engine

A Fuel pump is a component used in many liquid-fuelled engines (such as petrol/gasoline or diesel engines) to transfer the fuel from the fuel tank to the device where it is mixed with the intake air (such as the carburetor or fuel injector).

Carbureted engines often use low-pressure mechanical pumps that are mounted on the engine. Fuel injected engines use either electric fuel pumps mounted inside the fuel tank (for lower pressure manifold injection systems)[1] or high-pressure mechanical pumps mounted on the engine (for high-pressure direct injection systems).

Some engines do not use any fuel pump at all. A low-pressure fuel supply used by a carbureted engine can be achieved through a gravity feed system, i.e. by simply mounting the tank higher than the carburetor. This method is commonly used in carbureted motorcycles, where the tank is usually directly above the engine.

  1. ^ Hollembeak, Barry (2005). Classroom Manual for Automotive Fuels and Emissions. Cengage Learning. p. 154. ISBN 9781401839048. Retrieved June 12, 2012.

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