If aviation gasoline vaporizes too readily, fuel lines may become filled with vapor and cause increased fuel flow.
A measure of a gasoline's tendency to vapor lock is obtained from the Reid vapor pressure test.

Regarding the above statements,

Question

If aviation gasoline vaporizes too readily, fuel lines may become filled with vapor and cause increased fuel flow.
A measure of a gasoline's tendency to vapor lock is obtained from the Reid vapor pressure test.

Regarding the above statements,

BlackTom AI · Accepted Answer

Vapor pockets in a fuel system interrupt liquid continuity and reduce or stop flow, so vaporization causes vapor lock and loss (not increase) of fuel flow.

1. Relevant knowledge points and concepts
- Vapor lock: formation of vapor bubbles in fuel lines or pumps that interrupts the continuous liquid fuel flow, causing reduced flow, rough running, or engine stoppage.
- Vapor pressure and volatility: a fuel with higher vapor pressure vaporizes more readily at a given temperature.
- Reid vapor pressure (RVP) test: a standardized laboratory test measuring the equilibrium vapor pressure of a gasoline sample at 100°F (37.8°C). RVP is used as an index of volatility and the tendency of a fuel to vaporize and therefore to vapor lock.

2. Step-by-step reasoning
- Statement 1 claims excessive vaporization “may become filled with vapor and cause increased fuel flow.” If a line fills with vapor, the liquid column is interrupted; pumps and injectors lose prime or cavitate, reducing the delivered liquid fuel. Therefore the physical effect of vapor pockets is decreased or interrupted flow, not increased flow.
- Statement 2 links vapor lock tendency to the Reid vapor pressure test. Since RVP quantifies gasoline volatility at a standard temperature, it is used to assess how likely the fuel is to vaporize in service and thus its tendency to cause vapor lock.

3. Intermediate logic steps (explicit)
- High RVP → higher volatility → easier vaporization at operating temperatures.
- Easier vaporization → more vapor pockets form in fuel lines.
- Vapor pockets → interruption or reduction of liquid fuel flow (vapor lock symptoms).

4. Why the correct answer is correct
Because Statement 1 contradicts the fundamental behavior of vapor pockets (they reduce, not increase, flow), it is false. Statement 2 correctly identifies RVP as the standard measure used to assess a gasoline’s vaporization tendency and its propensity to vapor lock, so it is true.

5. Why other options are incorrect
- “Both statements true” is wrong because Statement 1 is false.
- “Both statements false” is wrong because Statement 2 is true.
- “Only No. 1 is true” is wrong because No. 1 is false.

6. Conclusion
Only No. 2 is true. This matches the provided correct answer: only No. 2 is true.

If aviation gasoline vaporizes too readily, fuel lines may become filled with vapor and cause increased fuel flow. A measure of a gasoline's tendency to vapor lock is obtained from the Reid vapor pressure test. Regarding the above statements,单项选择题

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