🔍 Key Concepts

• How a diesel fuel injection pump and plunger work to deliver high‑pressure fuel to the injector • What happens in a cylinder if the fuel injection event does NOT occur correctly • Difference between a local problem in one pump/plunger and a condition that affects the whole engine

💭 Think About

• If one pump plunger sticks, does it affect one cylinder or the entire engine? How would that show up in engine operation? • Think about the fuel path: pump plunger → high‑pressure line → injector → combustion. If the plunger is stuck, what step in this chain is interrupted? • Which of the choices describes the most direct and immediate result in the affected cylinder, rather than a possible secondary or long‑term effect?

✅ Before You Answer

• Be clear on the function of the injection pump plunger versus the function of the injector nozzle • Decide whether a stuck plunger would stop fuel to one cylinder or to all cylinders • Ask which choice describes the primary combustion effect in that cylinder when fuel is not properly injected