What is the purpose of the pressurizing portion of the same valve?

• A. Provides primary and secondary fuel flow to dual-line duplex nozzles
• B. Drains fuel from manifolds after shutdown
• C. Regulates fuel temperature
• D. Controls mixture ratio

Answer: (A)

The pressurizing portion sets up and hold fuel pressure for the injectors. In a dual-line duplex nozzle arrangement, each nozzle receives fuel through two paths—primary for lighter or starting conditions and secondary for higher power demands. The pressurizing section keeps both lines pressurized so fuel can flow immediately and consistently as engine power changes, giving proper atomization and responsive fuel delivery. Draining after shutdown, temperature regulation, and mixture ratio adjustment are handled by other parts of the system, not by the pressurizing portion.