Fuel pump
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A fuel pump is a component used in many liquid-fuelled engines to transfer the fuel from the fuel tank to the device where it is mixed with the intake air.
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
Diaphragm pump
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A diaphragm pump is a positive displacement pump that uses a combination of the reciprocating action of a rubber, thermoplastic or teflon diaphragm and suitable valves on either side of the diaphragm
Fuel pump
…carburetor. These fuel pumps operate at a relatively low fuel pressure of 10–15 psi (0.7–1.0 bar). The two most widely used types of mechanical pumps are diaphragm pumps and plunger pumps. Pumps for modern direct-injection engines operate at a much higher pressure, up to 30,000 psi (2,100 bar) and have configurations…
Cross-section sketch of diaphragm fuel pump
Air-operated double diaphragm pump
Double acting membrane pump on oil tanker deck