Which fuel injector combines the fuel pump and nozzle into one pump?

Prepare for the Engineman EN A School Test 1. Utilize flashcards and multiple choice questions with detailed explanations to boost confidence and readiness for the test.

The concept tested is how the fuel pump and injector can be integrated into a single unit. A unit injector combines the pumping element and the nozzle in one housing mounted on each cylinder. When driven by the engine, this unit pressurizes fuel internally and then injects it directly through the nozzle into the combustion chamber. This setup contrasts with systems like common rail, which uses a separate high-pressure pump feeding a central rail to individual injectors, or with direct injectors that spray into the chamber while the pump remains a separate component, and with pintle injectors that describe a nozzle design rather than pump integration. Because the pump and nozzle are bundled together in the unit injector, it’s the design that matches “combines the fuel pump and nozzle into one pump.”