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SESK: Stuff Everyone Should Know · sesk.info/sport-103-fuel-capacity

What is the maximum fuel capacity of a powered Part 103 ultralight?

5 U.S. gallons of fuel capacity.

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  1. 10 U.S. gallons
  2. 2 U.S. gallons
  3. 5 U.S. gallons ✔

Why: Part 103 says a powered ultralight has a fuel capacity not exceeding 5 U.S. gallons. It is a limit on the tank size, not just on what you put in it.

Huh, didn't know that: Fuel capacity is one of four tests a powered ultralight must meet, along with weight, top speed and stall speed.

The dad joke
Why was the ultralight so calm at the gas station? It only had five gallons of worries.
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References

Answer: 5 U.S. gallons. Part 103 says a powered ultralight has a fuel capacity not exceeding 5 U.S. gallons. It is a limit on the tank size, not just on what you put in it.

  1. 14 CFR Part 103, Ultralight Vehicles (eCFR) www.ecfr.gov/api/renderer/v1/content/enhanced/current/title-14?part=103
    Has a fuel capacity not exceeding 5 U.S. gallons;
    Checked 2026-10-11.

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Test yourself in the game

FlyingWhich certificates must you hold to fly a legal Part 103 ultralight?FlyingA powered ultralight under Part 103 must weigh less than how much empty?FlyingAt full power in level flight, a powered ultralight may not exceed what speed?

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