Aviation Mechanic - General, Airframe, and Powerplant › II. Airframe › Task J. Aircraft Fuel Systems

AM.II.J.S6

Skill

Troubleshoot a fuel valve problem.

Study note

Get a short, cited explanation of this element written from the FAA handbooks: the core idea, the numbers that matter, common test traps, and a quick self-check.

From the FAA library

Aviation Maintenance Technician Handbook - Powerplant p. 10-38
Chapter 10: Engine Maintenance & Operation › Engine Troubleshooting
Obviously, something is wrong; a higher power input (manifold pressure) is now…
Aviation Maintenance Technician Handbook - Powerplant p. 2-40
Chapter 2: Engine Fuel & Fuel Metering Systems › Fuel Control Maintenance › Fuel System Operation
Water Injection System Fuel Control Maintenance Fuel System Operation The fuel pump receives fuel from the airplane fuel system. The low pressure boost stage of the pump pressurizes the fuel and sends it to the fuel/oil cooler (FOC). The fuel ... flows from the FOC, through the fuel pump filter element, and then to the high pressure main stage of the pump. The high pressure main stage increases the fuel pressure and sends it to the fuel metering unit…
Aviation Maintenance Technician Handbook - Powerplant p. 2-41
Chapter 2: Engine Fuel & Fuel Metering Systems › Engine Fuel System Components › Main Fuel Pumps (Engine Driven)
Figure 2-60. The impeller, which is driven at a greater speed than the high pressure elements, increases the fuel pressure depending upon engine speed. The fuel is discharged from the boost element (impeller) to the two high-pressure gear ... elements. A relief valve is incorporated in the discharge port of the pump. This valve opens at a predetermined pressure and is capable of bypassing the total fuel flow. This allows fuel in excess of that required for engine operation…