For most gasoline-powered vehicles, how shall the liquid fuel leak inspection be conducted?

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Multiple Choice

For most gasoline-powered vehicles, how shall the liquid fuel leak inspection be conducted?

Explanation:
The test for liquid fuel leaks is performed with the engine running so the fuel system is under normal operating pressure. When the engine is running, the fuel pump is active and pressure is present in hoses, lines, and components like fuel rails or injectors. Any leak will show up as wetness, drips, or a fuel smell under pressure, which wouldn’t reliably appear if the engine were off or not under load. Testing with the engine running simulates real operating conditions and helps reveal leaks that only occur when the system is pressurized.

The test for liquid fuel leaks is performed with the engine running so the fuel system is under normal operating pressure. When the engine is running, the fuel pump is active and pressure is present in hoses, lines, and components like fuel rails or injectors. Any leak will show up as wetness, drips, or a fuel smell under pressure, which wouldn’t reliably appear if the engine were off or not under load. Testing with the engine running simulates real operating conditions and helps reveal leaks that only occur when the system is pressurized.

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