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The fuel system
1 viewOct 7, 2026
How fuel gets from the two wing tanks to the injected engine of the 172S: vents, selector, auxiliary and engine-driven pumps. How to sample it, and what to do when you find water.
What you learn
- Know the numbers: 28 US gal per tank, 53 US gal usable
- Explain why the vents matter and what a blocked vent does
- Use the selector: BOTH for take-off and landing, and why
- Know what the auxiliary pump does: priming and backup
- Sample fuel for water, dirt and colour, and know when not to fly
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