Fuel Injector Knowledge Assessment

Rob and Matt discuss fuel injectors, covering common issues, types, and benefits of replacing them during engine overhauls. They explain the differences between Huey injectors and others, and compare new versus remanufactured injectors, including core return policies.

What is the most common reason for fuel injector failure?

• Mechanical wear

• High pressure

• Electrical issues

• Contamination

Which type of injector is used in earlier Navistar engines?

• G 2.9 Huey injector

• 14 liter Detroit injector

• Mechanical ISX injector

• DT 466 Huey injector

Which injector is used in Caterpillar C15 engines?

• 10R-1000 injector

• DT 466 Huey injector

• G 2.9 Huey injector

• 14 liter Detroit injector

What is a key benefit of replacing fuel injectors during an engine overhaul?

• Reduced engine noise

• Lower maintenance costs

• Better fuel economy

• Increased engine size

What happens to the fuel spray holes in injectors over time?

• They stay the same

• They get bigger

• They get clogged

• They get smaller

How does a Huey injector create the pressure needed to force fuel into the combustion chamber?

• Using a push rod

• Using a rocker lever

• Using a hydraulic pump

• Using a solenoid

What is a common feature of both old-style and new-style Huey injectors?

• They use hydraulic pressure to force fuel

• They have no electronic components

• They are mechanically controlled

• They are used in Cummins engines

What is a key difference between a Huey injector and an ISX injector?

• Huey injectors use a push rod

• ISX injectors use hydraulic pressure

• Huey injectors use a hydraulic pump

• ISX injectors are electronically controlled

Why is it rare to see a brand new injector?

• They are too expensive

• They are not as efficient

• They are difficult to install

• They are not compatible with most engines

What is required for a core to be returnable?

• It must have a smashed tip

• It must be the same injector type

• It must have broken terminals

• It must be a different type of injector