If the fires in both boilers start to...

🔍 Key Concepts

• Boiler combustion and fuel supply – what causes burners to sputter or flame to become unstable • Difference between high suction and low suction on fuel oil tanks and what each one tells you about tank level/conditions • How changes in fuel pump speed vs. suction source affect flame stability

💭 Think About

• When fires in both boilers sputter at the same time, does that suggest a problem with one burner or with the common fuel supply? • Would increasing pump speed fix a problem of getting air into the fuel line, or could it make that worse? • Think about what happens inside a fuel tank as the level drops and suction starts to pull air or sludge instead of clean fuel.

✅ Before You Answer

• Identify which choices change the fuel supply source or suction level, not just its pressure or speed • Consider which action would be safest to protect burners and fuel lines from air or sludge if tank level is getting low • Ask yourself: which option is the quickest way to restore a steady, clean fuel flow to the burners in an apparent low-suction situation?

If the fires in both boilers start to sputter, you should immediately __________.

shift feed suction to the double bottom

speed up the fuel oil pump

shift settlers

shift to the low suction