Kris Otuafi: high-wing aircraft such as the Cessna series of light aircraft all use gravity fed fuel systems. this is because the wings are slightly bent upwards, and cause the fuel to drain down into the engine without the need of a pump (which is just another thing that can go wrong when you are flying).engine-driven or electrically driven fuel pumps are required in low-wing aircraft as well as most larger aircraft. because the fuel in the wing tanks are lower than the engine, gravity cannot assist the fuel flow, so a pump is required; usually 1 inside the tank and 1 pump driven by the engine. there are 2 pumps for redundancy just in case 1 fails.also, fuel pumps in transport aircraft are used not only to feed the engine, but also feed other fuel tanks (they can sometimes be called 'boost pumps' or 'transfer pumps'). there are various reasons for doing this such as a weight imbalance, or an engine failure (where you want to crossfeed the functioning engine with fuel fro! m the non-functioning side)....Show more
Houston Venezia: gas is introduced via gravity pass without using a gas pump. basically extreme wing planes which contain Cessnas have gravity feed, the gas is in wing tanks, that are nicely above the engine.
Iris Shawcroft: As Jason said, all high wing Cessna's rely on gravity feed, it's foolproof. All low wing aircraft I've ever flown have both engine driven AND electric fuel pumps. Always use the electric pump on takeoff to guard against the possible failure of the engine driven pump when you're low and slow, turn it off when you get around 1,000 AGL (above ground level)
Lyman Gauld: high wing cessna do rely on gravity feed but when fuel injected they also have an electric pump and an engine driven pump.
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