757. When possible, what is the FIRST step in fighting an engine fuel-pump fire which results from a broken fuel line?

The initial and most effective response to a fuel-pump fire caused by a broken fuel line is to close the fuel line valve, thereby eliminating the fuel source. This action prioritizes fuel source isolation, a fundamental principle of fire control, and aligns with standard marine firefighting practices utilizing emergency fuel shutoff valves. Subsequent actions, such as foam application and space isolation, are secondary to securing the fuel supply.