What does a fuel flow indicator measure in a reciprocating engine system?

A fuel flow indicator is designed to measure the rate at which fuel is being delivered to the engine. This is crucial for engine performance as it helps the pilot or maintenance personnel understand how efficiently the engine is receiving fuel during operation. Monitoring fuel flow can also assist in optimizing fuel consumption and ensuring that the engine is operating within safe and efficient limits.

The ability to assess the fuel flow rate is particularly important in flight applications, where fuel efficiency can significantly affect range and performance. Additionally, it helps in troubleshooting issues such as fuel starvation or excessive fuel flow that could lead to operational problems.

The other options pertain to different aspects of fuel management or system monitoring but do not reflect the specific function of a fuel flow indicator. For instance, the quantity of fuel consumed over time pertains more to fuel totalizers, while the pressure of fuel encompasses aspects of fuel system integrity rather than flow rate. The temperature of fuel is relevant for assessing potential vapor lock or fuel quality, not flow rate measurement.