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

AM.II.J.S7

Skill

Drain fuel system sump(s).

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

Pilot's Handbook of Aeronautical Knowledge p. 7-26
Chapter 7: Aircraft Systems › Fuel Systems › Fuel Strainers, Sumps, and Drains
system and cause vapor lock, which makes it difficult to restart the engine. On fuel-injected engines, the fuel becomes so hot it vaporizes in the fuel line, not allowing fuel to reach the cylinders. Figure 7-31. Fuel selector ... sump is a low point in a fuel system and/or fuel tank. The fuel system may contain a sump, a fuel strainer, and fuel tank drains, which may be collocated. The fuel strainer should be drained before each flight. Fuel…
Aviation Maintenance Technician Handbook - Airframe p. 14-50
Chapter 14: Aircraft Fuel Systems › Checking for Fuel System Contaminants › Solid Particle Contaminants
Figure 14-93. A sump drain tool used to open and collect fuel and contaminants from the fuel system sumps. Daily sump draining is part of the procedures needed to remove water from fuel that is to be delivered ... elements are designed to trap these contaminants and some fall into the sump to be drained off. Pieces of debris from the inside of the fuel system may also accumulate, such as broken-off sealant, or pieces of filter elements…
Aviation Maintenance Technician Handbook - Airframe p. 14-24
Chapter 14: Aircraft Fuel Systems › Fuel System Components › Fuel Valves
There are many fuel valve uses in aircraft fuel systems. They are used to shut off fuel flow or to route the fuel to a desired location. Other than sump drain valves, light aircraft fuel systems may include only…