🔍 Key Concepts

• Unit injector vs. separate jerk pump plus injector – where is the pumping element located? • Common rail system – look for a high‑pressure manifold feeding multiple cylinders. • Marine boiler burner terminology like flame plate – which system uses that language, engines or boilers?

💭 Think About

• Look closely at the cylinder head area: do you see a single, tall assembly that both receives cam motion and delivers fuel directly into the combustion space, or do you see a separate pump with a high‑pressure line going to a nozzle? • Ask yourself whether the illustration shows any common high‑pressure fuel pipe feeding several cylinders, or only individual devices at each cylinder head. • Which option includes components (like a flame plate) that you would expect more on an oil burner for a boiler rather than on a diesel engine cylinder?.

✅ Before You Answer

• Verify whether there is a high‑pressure fuel line running from a separate pump body to the injector nozzle, or if the cam acts directly on the injector body in the head. • Check if there is a common high‑pressure rail or manifold anywhere in the drawing feeding the cylinder – if you don’t see one, be cautious with any answer mentioning it. • Eliminate any answers that include parts you would normally associate with boiler burners instead of diesel engine cylinder fuel injectors.