92F Military Occupational Specialty (MOS) Training Test 1 Practice

An impeller is the rotating element in a centrifugal fuel pump. As it spins, it creates a low-pressure area at the inlet, which draws fuel into the pump from the tank or reserve line. That suction action effectively pulls fuel forward into the pump. Once inside, the impeller accelerates the fuel outward toward the discharge path, building pressure for delivery.

Piston pumps draw fuel in on the back stroke and push it out on the forward stroke, but the specific idea of pulling fuel forward due to suction is most closely associated with the impeller’s operation. Gear pumps move fluid by trapped cavities between gears and push it forward, while valves regulate flow rather than actively pulling fuel through the system.