What precautions must be observed if a gravity feed fuel system is permitted to supply fuel to an engine from more than one tank at a time?

Question

BlackTom AI · Accepted Answer

Airspaces of gravity-feed tanks must be interconnected so all tanks share the same ventilation/pressure system. This prevents pressure differentials, unintended fuel transfer between tanks, and interruptions in gravity flow when more than one tank supplies the engine simultaneously.

Relevant knowledge points and concepts
- Gravity-feed systems rely on hydrostatic head and atmospheric pressure in the tank airspace to push fuel to the engine. Proper venting and pressure equalization are essential.
- If multiple tanks feed a common line, unequal venting or isolated airspaces can create pressure differences that cause fuel to siphon from one tank into another or produce flow interruptions.
- Regulatory and good-practice guidance requires a common vent/airspace when two or more tanks supply fuel simultaneously.

Step-by-step reasoning
1. Imagine two tanks feeding a single header by gravity. Fuel leaves both tanks into the common line; as fuel level drops, air must enter each tank to replace displaced volume.
2. If each tank’s airspace is isolated and vents are not interconnected, one tank’s venting conditions (wind, blockage, restrictor) can differ from the other, producing different pressures above the fuel surfaces.
3. A pressure difference can cause undesirable flow behavior: one tank could siphon into the other through the outlet lines, or one tank could stop feeding due to reduced head or partial vacuum formation, causing engine starvation or unstable supply.
4. Interconnecting the tank airspaces equalizes pressure so both tanks present the same head pressure to the common outlet, ensuring stable simultaneous supply.

Why the correct answer is correct
Interconnecting airspaces ensures uniform atmospheric pressure over each fuel surface and prevents unintended transfer or starvation when tanks feed together. It is the direct and necessary precaution for gravity-feed multiple-tank supply.

Why the other options are incorrect
- “The fuel outlet ports must have the same cross sectional area.” Matching outlet areas is neither necessary nor sufficient to ensure safe simultaneous supply; flow depends on tank elevation (head), fuel level, and venting, not just port area.
- “Each tank must have a valve in its outlet that automatically shuts off the line when the tank is empty.” Automatic shutoff valves are not a required precaution for gravity-feed multi-tank supply and would not address the primary problem of pressure equalization; they add complexity and are unnecessary if vents/airspaces are properly interconnected.

Conclusion
Therefore, the correct precaution is that the tank airspaces must be interconnected, which matches the provided answer.

What precautions must be observed if a gravity feed fuel system is permitted to supply fuel to an engine from more than one tank at a time?单项选择题

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