A mechanical fuel pump is actuated by what?

A mechanical fuel pump is actuated by what?

• A. Crankshaft
• B. Timing belt
• C. Camshaft
• D. Fuel pressure regulator

Answer: (C)

Mechanical fuel pumps are driven by the camshaft. A cam lobe pushes on a lever or pushrod that actuates the pump plunger, creating suction to draw fuel from the tank and then delivering it toward the carburetor or injectors. This setup keeps the pumping action in sync with the engine’s cycle because the camshaft governs valve timing and the overall timing of the intake/combustion events. The crankshaft is responsible for converting piston motion to rotation but doesn’t provide the precise reciprocating drive needed for the pump. The fuel pressure regulator doesn’t drive the pumping action either; it only modulates fuel pressure after the pump has moved fuel. In designs where a timing belt drives the camshaft, the belt indirectly controls the pump by driving the cam, but the direct actuation still comes from the camshaft.

Mechanical fuel pumps are driven by the camshaft. A cam lobe pushes on a lever or pushrod that actuates the pump plunger, creating suction to draw fuel from the tank and then delivering it toward the carburetor or injectors. This setup keeps the pumping action in sync with the engine’s cycle because the camshaft governs valve timing and the overall timing of the intake/combustion events. The crankshaft is responsible for converting piston motion to rotation but doesn’t provide the precise reciprocating drive needed for the pump. The fuel pressure regulator doesn’t drive the pumping action either; it only modulates fuel pressure after the pump has moved fuel. In designs where a timing belt drives the camshaft, the belt indirectly controls the pump by driving the cam, but the direct actuation still comes from the camshaft.