FAA Aviation Mechanic Powerplant (AMP)Fuel, Induction and LubricationMedium
A mechanic is troubleshooting a continuous-flow fuel injection system and needs to explain the purpose of the flow divider (distributor valve) to an apprentice. What function does this component perform?
- AIt divides metered fuel evenly and proportionally to each cylinder's injector nozzle
- BIt mixes fuel with intake air before the throttle body
- CIt filters contaminants out of fuel before it enters the injector lines
- DIt regulates cabin heater fuel flow separately from the engine
Show answer & explanationAnswer & explanation
Correct answer: A. It divides metered fuel evenly and proportionally to each cylinder's injector nozzle
In continuous-flow fuel injection systems, the flow divider receives metered fuel from the fuel control unit and evenly distributes it to the individual injector lines feeding each cylinder, in proportion to engine speed and load, ensuring balanced fuel delivery.
Why the other options are wrong
- B. Mixing occurs at the intake port near each cylinder, not in the flow divider.
- C. Filtering is performed by a separate fuel filter/strainer, not the flow divider.
- D. Cabin heaters are unrelated to the fuel injection flow divider.
Flow Divider (Distributor Valve)
A component in continuous-flow fuel injection systems that receives metered fuel and distributes it evenly and proportionally to each cylinder's fuel injector nozzle.
- Located downstream of the fuel control unit
- Contains a spring-loaded diaphragm/valve that opens with increasing fuel flow
- Ensures balanced fuel distribution among cylinders
Memory trick: The divider is the 'fuel referee' splitting flow fairly.