9. Contamination Control- Fuel Systems

In which year was the common rail fuel system introduced at Caterpillar?

• 1977

• 1991

• 2007

• 2012

Answer explanation

Common Rail fuel system was introduced in 2007.

What should be the ISO of dispensed fuel?

• 18/16/13

• 15/13/10

• 12/9/6

• 21/19/17

Answer explanation

Dispensed fuel should be 18/16/13

What is the root cause of wear in fuel systems?

• Adhesive

• Contact Stress

• Abrasive

• Corrosion

Answer explanation

Abrasive wear is the number one reason for premature unit injector replacement.

What should be the micron rating of secondary fuel filters?

• 10 micron

• 14 micron

• 6 micron

• 4 micron

Answer explanation

4 micron

What is the purpose of a Coalescer filter?

• To remove free water and contaminants.

• An additional filter.

• Kidney loop fuel.

• To remove corrosion.