Technical Support - Mechanical - Fuel Pumps
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Do I need to use a mechanical fuel pump with mechanical fuel injection or can I substitute an electric pump?

Typically spinning at half engine speed, a mechanical pump increases system volume and pressure according to increases in RPM. The varying volume and pressure from the pump is tailored to fit the fuel demands of the engine, from idle to wide open throttle, with the use of pills (jets), a barrel valve, and assorted bypass valves. Because of this, the constant pressure of an electric fuel pump is not suitable with mechanical fuel injection.