What is the purpose of the dump portion of the pressurizing and dump valve?

• A. Drains fuel from manifolds after shutdown
• B. Provides priming fuel for startup
• C. Maintains system pressure
• D. Adjusts fuel temperature

Answer: (A)

The dump portion is there to drain fuel from the manifolds after shutdown. When the engine is running, the pressurizing valve fills and maintains pressure in the fuel lines to feed the injectors. After shutdown, residual pressure can leave fuel trapped in the manifolds; the dump path opens so that this fuel can return to the tank and the lines are cleared. This helps prevent fuel pooling, reduces vapor formation, and prepares the system for the next start. Priming fuel for startup is a separate function, and the dump path does not keep system pressure or adjust fuel temperature.