🔍 Key Concepts

• Fuel contamination and how it affects injectors, filters, and pumps • Typical causes of diesel engine performance issues in real-world operations • The difference between maintenance-related issues and sudden mechanical failures

💭 Think About

• Which of these choices could affect every part of the fuel system over time, not just one component? • In normal service, what problem are engineers and operators always most worried about preventing in fuel tanks? • Which option is most likely to develop gradually and cause intermittent power loss or rough running rather than an immediate, obvious break?

✅ Before You Answer

• Compare how often you inspect for fuel cleanliness versus how often you actually see broken fuel lines on working vessels • Think about which problem would clog filters and injectors and lead to poor combustion • Ask: which issue is most commonly addressed by regular fuel treatment and filtration, not by alignment or structural repairs?