Diaphragm Pump (from Internet Glossary of Pumps)
Diaphragm Pump
Cars often use a Diaphragm Pump to move gasoline from the gas tank to the carburetor or fuel injection plugs.

The gasoline diaphragm pump in a car is operated by a cam geared directly to rotating parts of the engine. The cam pushes a pushrod.

The brown rod shown in this drawing is moved by the pushrod. It pushes the diaphragm in (a spring forces it back out.)

Fuel pumps like this one operate continuously but have a safety valve which returns fuel to the input side of the pump if pressure rises above a set level.

The pump usually has a fuel filter built into it. (The fuel system will have several other filters.)

Diaphragm pumps are very common and come in many sizes. Modern plastics are flexible and long lasting making this an ideal low-maintenance pump for many applications.

See also Double Diaphragm Pumps.

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Last modified February, 2002
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