Where in the fuel system is the fuel flow transmitter located?

Where in the fuel system is the fuel flow transmitter located?

• A. Between the fuel control and the fuel nozzles
• B. In the fuel tank
• C. In the engine accessory section
• D. After the fuel pump

Answer: (A)

The fuel flow transmitter is placed where it can measure the fuel that is actually being sent to the engine, i.e., after the metering is done by the fuel control and before the fuel reaches the nozzles. This location ensures the reading reflects the metered flow that will be delivered to the cylinders, including any losses in the restrictors or lines ahead of the injectors. If it were in the fuel tank, you’d be measuring quantity in the tank, not the real-time flow to the engine. In the engine accessory section, you’d be at a location not used for metered delivery to the injectors. If placed after the fuel pump, you’d still capture flow, but the signal would not accurately represent what the engine actually receives after the fuel control’s metering and line losses. The correct spot is the line between the fuel control and the fuel nozzles.

The fuel flow transmitter is placed where it can measure the fuel that is actually being sent to the engine, i.e., after the metering is done by the fuel control and before the fuel reaches the nozzles. This location ensures the reading reflects the metered flow that will be delivered to the cylinders, including any losses in the restrictors or lines ahead of the injectors.

If it were in the fuel tank, you’d be measuring quantity in the tank, not the real-time flow to the engine. In the engine accessory section, you’d be at a location not used for metered delivery to the injectors. If placed after the fuel pump, you’d still capture flow, but the signal would not accurately represent what the engine actually receives after the fuel control’s metering and line losses. The correct spot is the line between the fuel control and the fuel nozzles.