In piston-engine aircraft maintenance, vapor lock occurs when fuel boils prematurely inside the supply lines before reaching the engine. When fuel is exposed to high engine compartment temperatures and low atmospheric pressure at high altitudes, it vaporizes into gas bubbles. Because mechanical fuel pumps are designed to draw incompressible liquids rather than compressible gases, the accumulation of vapor pockets prevents the pump from generating sufficient suction. Consequently, fuel flow to the engine is disrupted, causing severe engine hesitation or a total loss of power.
According to the passage, what directly prevents the mechanical fuel pump from generating sufficient suction?
- AA sudden loss of engine power that causes fuel to vaporize in the lines
- The accumulation of compressible vapor pockets that the pump is not designed to drawAnswer
- CThe engine compartment's design requirement to process incompressible liquids
- DA disruption in fuel flow that occurs before any gas bubbles are formed
Answer
The accumulation of compressible vapor pockets that the pump is not designed to draw
The text directly states that mechanical fuel pumps are engineered to draw incompressible liquids rather than compressible gases; therefore, the presence and buildup of vapor pockets prevents the pump from generating adequate suction.
Step-by-Step Solution
Key Concept
Extracting explicitly stated cause-and-effect relationships from technical expository prose
Estimated Time:1m 0s