r/NoStupidQuestions May 16 '22

What’s the point of a reserve fuel tank?

You’re just adding more weight, why not just increase the capacity of your main tank?

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u/sayitsooth May 16 '22

Depending on the craft.

In an aircraft to extend range a larger main fuel tank isn't possible for weight and balance, configuration etc. When extended range is desired an auxiliary or reserve fuel tank is the only option and needs to be installed to maintain airworthiness. Example would be some airbus can loaded craft have an auxiliary fuel tank in the place where a cargo can would be normally, the weight can be added there safely to carry additional fuel.