Questions tagged [fuel-tanks]

Large cavities that store fuel, typically in the wings and/or belly of the plane.

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72 votes
6 answers
28k views

Why are fuel tanks in the wings filled first, and why are they used last?

When fueling airliners, why is fuel filled first in the tanks in the wings and then the center tanks? And why do they use fuel from the center tanks first and then from the tanks in the wings? From ...
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24 votes
3 answers
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Could airliners' wings be thinner if no fuel were stored in them?

I ask this question because wings are pretty thin overall, but I am curious if you could make them more thin.
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3 votes
1 answer
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How much fuel does an A380 hold and where?

How much fuel does an A380 usually carry (in litres) and what is the maximum? How much is in each wing? How much is in other fuel tanks and where are they?
17 votes
1 answer
8k views

Do tanker aircraft distribute their own fuel?

Do tanker aircraft, (such as the KC-135, KC-10, S-3B, etc), distribute fuel from their own fuel tanks, or is it strictly from a separate cargo tank? Obviously, some cargo tanks are going to be ...
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14 votes
4 answers
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What could cause uneven fuel levels in a Cessna 172?

I went for a 1.5 hour flight in a 1977 Cessna 172N, with several takeoffs and landings. I was alone. When I left, I had 18 gallons in each tank. When I arrived back, I had 15 gallons in the left tank, ...
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21 votes
6 answers
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Can a wide body airliner land safely with a full fuel tank?

Can a commercial double-aisle jet aircraft (e.g., 777, A330) land safely with a full fuel tank (minus the fuel spent on taxing and takeoff)? Has that ever happened?
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15 votes
5 answers
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What could the fuel pump failure have been that my flight experienced?

I was on an Easyjet flight (I think an A320), when mid-flight, I overheard a member of cabin crew tell another passenger there was a 'technical' issue with the aircraft, that might make us slightly ...
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8 votes
3 answers
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Can fuel be stored in the anti-shock bodies?

lets say an airplane needs to get to a certain route but doesnt have the fuel to do and it needs to store in the anti-shock bodies. Is it possible?
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8 votes
2 answers
25k views

Why do planes have cross-feed switches or circuits?

Why do planes have cross-feed switches or circuits? Are they to move contents of one tank to another (feed the tank) or to supply the engine with fuel from left side to right or vice versa (feed the ...
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3 votes
2 answers
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Why does flying inverted in a jet trainer starve the engine of fuel when there's a pump?

Such planes have an engine-driven fuel pump. If the pump isn't strong enough, wouldn't suction feeding assist? How does a modern fighter jet / aerobatic plane overcome this? Also, any general ...
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6 votes
2 answers
2k views

How does a fuel density sensor work? (densitometer, cadensicon)

While some fuel volume sensors use ultrasonic measurements this answer to How is fuel mass measured in airliners? says: The FCOM lists the sensors involved in this measurement: The FQI system ...
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40 votes
6 answers
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Is fuel moved around during flight on a passenger or cargo plane? If so why?

Is fuel moved around during flight on a passenger or cargo plane? If so why? Is balance an issue?
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23 votes
2 answers
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Have any operational aircraft ever used over wing fuel tanks?

We are most familiar with under wing fuel tanks, has any operational aircraft ever used over wing fuel tanks?
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14 votes
4 answers
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How are wing tanks sealed around the internal wing structure?

I can easily grasp the idea of tanks of fuel inside the fuselage of an aircraft, and the ease of sealing such tanks in a relatively standard shape. However, I'm having a hard time understanding how ...
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12 votes
4 answers
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Cessna 172/182: Should I set the tank selector to the R.H. tank after parking the airplane?

The single-engine Cessna 172 and 182 aircraft models have a dual gravity-fed fuel system, where you can draw from both the LH and RH tank simultaneously in flight. I've heard it said that when you ...
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11 votes
1 answer
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What is the capacity of the vent surge tank in an A320?

If the wing tanks of an A320 are fully filled and the fuel expands due to high temperatures then the fuel overflows into the vent tank. My question is, does the fuel get stored in the vent tank? If ...
9 votes
1 answer
4k views

What regulations surround fitting aftermarket fuel tanks inside the cabin?

Watching the first episode of Dangerous Flights, a ferry pilot has aftermarket fuel tanks fitted inside the cabin of an old Merlin IIB: What are the regulatory requirements to be able to do this? / ...
7 votes
1 answer
1k views

What is the working principle of anti-explosion fuel tanks?

I recently read a question about Anti Explosion fuel tanks which are self sealing. But the technology seemed to be too old after a bit of research, and that it was difficult to apply this age old ...
6 votes
1 answer
684 views

How is fuel drawn from drop tanks in WW2 airplanes?

Low-wing tanks typically have fuel supply lines at the bottom. For external drop tanks, I thought they came built with internal lines that mate with the plane. That appears to be the case for ...
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5 votes
2 answers
1k views

What fuels can turbofans burn?

I know that Jet-A is the fuel most often used for turbofans, but is there something else that these engines can burn? (ethanol, LPG, methane, butane, 100LL, etc.) Basically, can a turbofan burn ...
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25 votes
2 answers
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What happens to jettisoned fuel tanks?

When an F-15 (or your favorite fighter aircraft) punches it's external tanks... ...to engage in combat, (or when they are empty), what happens to them? Through my best reasoning skills and Newton's ...
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9 votes
2 answers
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How does fuel get to the engine during acrobatics?

Given that during acrobatics, extreme G-forces may be impressed upon the fuel tank, wouldn't it make it somewhat difficult for fuel to get to the fuel pump while it's being pushed against a specific ...
7 votes
1 answer
27k views

Where is the fuel stored on an aircraft’s wing?

Maybe guys could provide me with a picture I originally thought the anti-shock pads were fuel tanks, but somebody recently told me that they are stored in the wing, so where are they stored at. The ...
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6 votes
4 answers
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Would hydrogen fuel tanks on an airplane increase lift?

Since hydrogen is lighter than air, would hydrogen fuel tanks help provide lift for the airplane?
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2 votes
2 answers
549 views

How can adverse maneuverability due to a fuel tank behind the rear pressure bulkhead be mitigated in Airbus ZeroE hydrogen plane?

Airbus recently announced three concept aircraft for commercial use, powered by liquid hydrogen, with an ambition to have the plane in operation by 2035. https://www.airbus.com/innovation/zero-...
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1 answer
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What is the role of baffles in Fuel Tanks? [duplicate]

I think there are many baffles inside the shape of Fuel tank. What kind of advantage they do? Do they help in managing the oscillations in-flight?
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