One function of the fuel pump delivery check...

One function of the fuel pump delivery check valve is to __________.

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🔍 Key Concepts

• Fuel injection system components: delivery check valve, plunger and barrel, injector nozzle, high‑pressure fuel line • What a check valve does in general: allows flow in one direction and prevents reverse flow or unwanted pressure changes • Difference between injector nozzle functions and pump-side functions in a diesel engine

💭 Think About

• Ask yourself: Where in the system is the fuel pump delivery check valve located – near the pump plunger, in the injector, or in the leak‑off line? What does that tell you about its job? • Which option describes a function that would logically be handled inside the injector nozzle assembly rather than at the pump outlet? Eliminate those. • Think about pressure in the high‑pressure line after injection: should it stay high, drop quickly, or leak off in a controlled way? Which choice matches the job of a check valve at the pump outlet?

✅ Before You Answer

• Verify which component is mainly responsible for popping pressure – the injector nozzle spring/needle or the fuel pump delivery check valve. • Check which functions involve lubrication and leak‑off – are these more related to plunger‑and‑barrel clearances or to a one‑way check valve? • Confirm that a check valve’s primary role is about controlling flow and pressure behavior, not about chemical issues like carbon deposits on the nozzle.

🔍 Key Concepts

💭 Think About

✅ Before You Answer