The C172 has 2 kinds if fuel pumps, one is an engine driven pump and the other is an electrical (AUX) fuel pump. The reason why we have two fuel pumps powered by different systems is due to redundancy.
Does a Cessna 172 have a fuel pump?
Unlike low wing aircraft, the high wing Cessna 172 lets gravity do a lot of the work. Gravity helps pressurize the system, meaning it only needs the help of an electric boost pump in addition to the engine-driven fuel pump for operations like starting.
How many fuel pumps does a plane have?
Aircraft with fuel-pump systems have two fuel pumps. The main pump system is engine driven with an electricallydriven auxiliary pump provided for use in engine starting and in the event the engine pump fails. The auxiliary pump, also known as a boost pump, provides added reliability to the fuel system.
What does the fuel pump do in a Cessna 172?
Typically, fuel pump is turned on to make sure it works, and then off. Fuel pump is only used in flight if gravity-fed fuel pressure from the wing tanks drops due to flying at extreme angles of attack. Not a waste of battery, as you would be using electricity from the engine driver alternator.
How many pumps are there in each wing fuel tank?
There are six electrical fuel pumps, two in the center tank and two in each inner tank. Under normal conditions the fuel system is split, with one center tank pump and the two same side wing tank pumps supplying each engine.
Does a Cessna 150 have a fuel pump?
The Cessna 150 went through relatively minor changes over its run from 1959 through 1977. For all models, the engine remained the Continental O-200-A, rated for 100 hp. … The airplane has two wing tanks of 13 gallons each, which feed together by gravity and the engine-driven fuel pump.
What kind of airplane would require a fuel pump?
In high-wing aircraft, gravity propels the fuel from tank to carburetor, and fuel pumps might not be necessary. However, a low-wing airplane—and high-wing craft with fuel-injected engines—will need an engine-driven pump to move the fuel.
Do carbureted engines have fuel pumps?
Carbureted engines often use low pressure mechanical pumps that are mounted outside the fuel tank, whereas fuel injected engines often use electric fuel pumps that are mounted inside the fuel tank (and some fuel injected engines have two fuel pumps: one low pressure/high volume supply pump in the tank and one high …
How many pumps are provided in a fuel system Why?
They draw the fuel from the tank(s) and deliver it to the carburetor. The two pumps provide redundancy. The engine-driven fuel pump acts as the primary pump. The electric pump can supply fuel should the other fail.
What is over the wing refueling?
Over-the-wing refueling is accomplished by opening the fuel tank cap on the upper surface of the wing or fuselage, if equipped with fuselage tanks. The fueling nozzle is carefully inserted into the fill opening and fuel is pumped into the tank.
Where is the fuel tank on a Cessna?
The Cessna 208/208B has two main fuel tanks located in each wing (left and right) and a small reservoir tank located under the cabin floor in forward fuselage. The total fuel capacity of 335.6 US gallons and a useable fuel capacity of the main tanks is 332 US gallons.
What is the fuel consumption of a Cessna 172?
The burn rate of the 172 is 8.5 gallons of fuel (32.176 litres) per hour.
How do you drain gas from a C172?
You could drain fuel from the tanks through the sumps, generally located under the wings. A tool with a rod would be required to open the valve on the sumps and you could use a tube with a funnel on it to collect the fuel into a container.
What does the term wet wing mean?
A wet wing is an aerospace engineering technique where an aircraft’s wing structure is sealed and used as a fuel tank. By eliminating the need for fuel bladders, aircraft can weigh less and offer improved performance. Wet wings are common among civilian designs, from airliners to small general aviation aircraft.
Why is it necessary to vent all aircraft fuel tanks?
Each tank is vented (or pressurised) to allow air into the tank to take the place of burned fuel; otherwise, the tank would be in negative pressure which would result in engine fuel starvation. A vent also allows for changes in atmospheric pressure and temperature.
Where is fuel stored in fighter jets?
Placement. On passenger planes, fuel tanks are often integrated into the wings, and when there are also tanks inside the body of the aircraft, the wing tanks are used preferentially. The placement reduces the stress on the wings during takeoff and flight, by putting the heavy fuel directly inside the source of lift.