Which fuel tank fuels the APU on the 737?

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Multiple Choice

Which fuel tank fuels the APU on the 737?

Explanation:
The APU on the 737 is fed from the left main fuel tank (Tank 1) through its own dedicated fuel pump. This setup provides a consistent, reliable fuel source for the APU during ground operations and starts without needing to draw from the right tank. It also keeps engine fuel management straightforward, since the left tank is the primary source connected to the engine #1 feed and common fuel lines. The right tank isn’t used for normal APU operation in this configuration, and external fuel sources aren’t involved in standard APU supply.

The APU on the 737 is fed from the left main fuel tank (Tank 1) through its own dedicated fuel pump. This setup provides a consistent, reliable fuel source for the APU during ground operations and starts without needing to draw from the right tank. It also keeps engine fuel management straightforward, since the left tank is the primary source connected to the engine #1 feed and common fuel lines. The right tank isn’t used for normal APU operation in this configuration, and external fuel sources aren’t involved in standard APU supply.

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