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USAF Electrical Power Production (AFSC 3E0X2) On-Site Power Module 2 Practice Test

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A mechanical fuel pump is typically driven by which engine component?
Correct Answer:
Camshaft
Explanation:
A mechanical fuel pump is typically driven by the camshaft because the camshaft is the engine component designed to convert rotational motion into controlled, timed actions for engine accessories. A lobe or eccentric on the camshaft pushes a pump pushrod or diaphragm, creating suction to draw fuel and then pushing it toward the carburetor or injection system. This setup keeps fuel delivery tied to the engine’s timing events, so fuel is available when cylinders need it and at the right pressure as RPM changes. The crankshaft mainly powers piston movement, and while some systems can use electric power, a mechanical pump relies on the camshaft’s timing mechanism.

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