QuestionSeptember 18, 2025

What determines the maximum fuel outlet pressure from a mechanical diaphragm pump? a. Fuel line restriction b. Engine rpm c. Spring force d. Return check valve

What determines the maximum fuel outlet pressure from a mechanical diaphragm pump? a. Fuel line restriction b. Engine rpm c. Spring force d. Return check valve
What determines the maximum fuel outlet pressure from a mechanical diaphragm pump?
a. Fuel line restriction
b. Engine rpm
c. Spring force
d. Return check valve

Solution
4.6(255 votes)

Answer

c. Spring force Explanation 1. Identify the pressure-limiting mechanism The diaphragm pump uses a spring to push the diaphragm, creating pressure. The maximum outlet pressure is reached when the fuel pressure equals the spring force per unit area. 2. Analyze other options Fuel line restriction affects flow, not max pressure. Engine rpm affects frequency, not peak pressure. Return check valve prevents backflow but doesn't set max pressure.

Explanation

1. Identify the pressure-limiting mechanism<br /> The diaphragm pump uses a spring to push the diaphragm, creating pressure. The maximum outlet pressure is reached when the fuel pressure equals the spring force per unit area.<br />2. Analyze other options<br /> Fuel line restriction affects flow, not max pressure. Engine rpm affects frequency, not peak pressure. Return check valve prevents backflow but doesn't set max pressure.
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