Ameer Randolph
The Cessna 172S has two fuel tanks, with one tank mounted in each wing. Each tank holds 28 gallons of fuel, for a total fuel capacity of 56 gallons, though only 53 gallons of this fuel is usable. This is because the lines that draw fuel to the engine are slightly above the bottom of the tank, avoiding any fuel contaminants that may have settled at the bottom. The Cessna 172S is also unique in that its fuel selector valve can be placed in a both position, allowing fuel to flow from both the left and right tanks simultaneously. Some Cessna models also feature long-range tanks, and for super long distances, special ferry tanks can be installed, though this requires removing the rear seat and reducing baggage capacity.
Explore related products
What You'll Learn
Cessna 172S has two fuel tanks mounted in each wing
The Cessna 172S is a high-wing aircraft, meaning that its wings are positioned above the fuselage. This design choice allows gravity to play a significant role in the fuel system. The Cessna 172S has two fuel tanks, with one tank mounted in each wing. Each tank holds 28 gallons of fuel, resulting in a total fuel capacity of 56 gallons. However, only 53 gallons of this fuel is usable. This is because the lines that draw fuel to the engine are slightly above the bottom of the tanks to avoid contaminants, making the remaining fuel at the bottom of the tanks unusable.
The fuel system in the Cessna 172S is a combination of gravity and pump-driven mechanisms. Gravity helps pressurize the system, and the high-wing design ensures that fuel can flow due to the weight of the fuel in the tank. This gravitational force pulls the fuel down into the gascolator (also known as a fuel strainer) and the carburetor. The gascolator plays a crucial role in eliminating sediment and contaminants from the fuel before it reaches the engine. Contaminated fuel can cause engine damage or failure, so it is essential to ensure that the fuel is clean.
The Cessna 172S also utilizes an engine-driven fuel pump and an electric boost pump for operations like starting the engine. The engine-driven pump is powered by the engine's accessory case, and it works in conjunction with the electric pump to ensure adequate fuel pressure. Additionally, the electric pump serves as a backup in case the engine-driven pump fails, providing enough fuel pressure to maintain normal engine operation. This redundancy in the fuel system enhances the safety and reliability of the Cessna 172S.
It is worth noting that the fuel capacity and tank configuration can vary among different models of the Cessna 172. For example, the 172C model has been reported to have a total fuel capacity of 39 gallons, with 36 gallons being usable. The 172M model, on the other hand, is known for its long-range tanks, offering 48 gallons of usable fuel. These variations in fuel capacity and tank design highlight the importance of referring to the specific aircraft's POH or AFM for the most accurate information regarding its fuel system.
Understanding the fuel system of the Cessna 172S is crucial for pilots and mechanics alike. By comprehending the interplay between gravity and the fuel pumps, as well as the location and capacity of the fuel tanks, operators can ensure efficient and safe flights. Additionally, the presence of fuel selectors and strainers underscores the importance of routine inspections and proper fuel management procedures to maintain optimal aircraft performance.
Understanding GRV: Fuel Tank Safety and Efficiency
You may want to see also
Explore related products
Cessna P210N has two small reservoir tanks on the fuselage's lower side
The Cessna P210N has two small reservoir tanks on the lower side of the fuselage. The plane's POH (possibly referring to the Pilot's Operating Handbook) and maintenance manual state that fuel goes from the main tanks into these two small reservoir tanks, and from there through the fuel tank selector valve to the engine. However, the exact location of these tanks is not specified in the POH or manual. They could be below the wings, between the engine and firewall, or below the pilot's seats.
The Cessna P210N is not the only model with multiple tanks. For example, the Cessna 172S has two fuel tanks, one mounted in each wing, with a total fuel capacity of 56 gallons (though only 53 gallons are usable). The Cessna 172 series also includes models with auxiliary tanks in the baggage compartment.
Some Cessnas have been observed to have unbalanced fuel draw, with more fuel being used from one tank than the other. This can be due to several factors, including the positioning of vent tubes, old caps with poor seals, and differences in air pressure across the wingspan. To address this issue, pilots can perform the air bubble test to ensure the vent line is open and functioning properly, and adjust the fuel selector valve during flight to equalize fuel levels.
For longer flights requiring increased range, it may be possible to extend or modify the fuel tanks in some Cessna models. Some Cessna 182s, for example, come with long-range tanks as part of the installed design, offering a total of 74 gallons of fuel for a 5-hour endurance flight. Additionally, special ferry tanks can be installed for super long-distance flights, though this may require removing the rear seat and reducing baggage and passenger capacity.
Plastic Fuel Tanks: What Material Works Best?
You may want to see also
Explore related products
Cessna 182s come with long-range tanks
The Cessna 182 is a popular aircraft that offers several fuel tank options. Some 182s come with long-range tanks as part of their original design. For example, the 1975 182P model has 37 gallons of fuel capacity per side, for a total of 74 gallons. This amount of fuel allows for a 5-hour endurance flight with VFR reserves.
Owners of the Cessna 182 have several options to modify their fuel tanks for increased range. One option is to install special ferry tanks, which can provide sufficient fuel for super long-distance flights. However, this modification comes at the cost of removing the rear seat and reducing the amount of baggage and passenger capacity.
Another option for extending the range of a Cessna 182 is to modify the existing fuel bladder or install additional tanks. For example, Monarch offers a solution where they modify the existing bladder and add additional fuel tanks, resulting in an extra 18 gallons of fuel capacity per side. This modification does not require extra pumps or valves but does involve significant work on the wings and can be expensive.
It is important to note that proper fuel tank maintenance and balancing are crucial for the Cessna 182. When the fuel selector valve handle is in the "BOTH" position during cruising flight, unequal fuel flow from each tank may occur if the wings are not maintained exactly level. This issue can be mitigated by gradually turning the selector valve handle to the "heavy" wing, allowing fuel to flow more evenly. Additionally, ensuring proper vent line positioning and functionality through tests, such as the air bubble test, is essential for safe and efficient fuel flow.
Unlocking Your Mazda 3's Fuel Tank Cap
You may want to see also
Explore related products
Cessna 172 fuel tanks have a total capacity of 56 gallons
The Cessna 172 is a popular aircraft with several model variants. The fuel capacity of the Cessna 172 varies depending on the specific model and any modifications made. For example, the 172G model has a total fuel capacity of 39 gallons, with 38 gallons usable in level flight and 36 gallons usable in all flight conditions, according to the owner's manual. However, some pilots have reported flying a 172G with two 25-gallon tanks, which may have been an optional upgrade.
The Cessna 172R model is mentioned as having a fuel capacity of 56 gallons, which matches the user's query. This model is specifically the 2001 Cessna 172R with the IO360 engine. It's important to note that different models may have different fuel capacities, and modifications or upgrades can further change the fuel capacity of an aircraft.
Some Cessna 172 aircraft have been modified to include long-range fuel tanks, which can increase the overall fuel capacity. These long-range tanks may be installed as a factory option or added aftermarket. The installation of long-range tanks can impact the aircraft's performance and range, making it more suitable for longer flights.
Additionally, some Cessna 172 models may have an auxiliary fuel tank installed in the baggage compartment, typically with a capacity of around 15 gallons. This option provides even more fuel capacity for extended flights or as a backup fuel source.
To accurately determine the fuel capacity of a specific Cessna 172 aircraft, it is recommended to refer to the owner's manual or aircraft documentation. It may also be necessary to consider any modifications or upgrades that have been made to the fuel system.
Fuel Sending Unit Removal: Safe or Not?
You may want to see also
Explore related products
Fuel vents can be switched to equal out fuel in long-range bladder tanks
Cessna is an aircraft manufacturer that produces a variety of planes, including the 172, 182, and 210 series. Some of these planes, particularly the 182 series, come with long-range fuel tanks as part of their installed design. These long-range fuel tanks can have a capacity of up to 37 gallons per side, offering a total of 74 gallons of fuel for extended flight endurance.
Now, let's discuss the role of fuel vents and how they relate to equalizing fuel in long-range bladder tanks. In a Cessna aircraft, fuel vents play a crucial role in ensuring proper fuel flow and equalization between tanks. Cessna planes typically have fuel vents located on the wings, and these vents can be switched to control fuel draw from the tanks.
When the fuel selector valve handle is set to the "BOTH" position during cruising flight, unequal fuel flow from the tanks may occur if the wings are not maintained exactly level. This can result in one wing becoming heavier than the other. To address this imbalance and equal out the fuel in the long-range bladder tanks, the pilot can gradually turn the selector valve handle to the tank in the "heavy" wing. This action will prioritize fuel draw from the heavier tank, gradually equalizing the fuel levels between the two wings.
Additionally, it is important to ensure proper vent tube positioning. If a vent tube is not positioned correctly in the dead air zone behind the strut, it can pressurize the corresponding tank, causing fuel to flow out of that tank more rapidly. Proper alignment of the vent tubes is crucial to ensure even fuel feed during flight. Cessna later transitioned to a design with two fuel vents to address this issue, allowing for better control over fuel equalization.
Furthermore, it is recommended to perform the “air bubble in the water” test, as mentioned in the service manuals, to ensure that the vent line is open and allows airflow in both directions. This test helps verify the proper functioning of the vent line and can identify any blockages or restrictions. By following these procedures and adjustments, pilots can effectively utilize the fuel vents to equal out fuel in the long-range bladder tanks of their Cessna aircraft.
Removing a Motorcycle Fuel Tank: A Step-by-Step Guide
You may want to see also
Frequently asked questions
There are two fuel tanks, with one tank mounted in each wing.
Each tank holds 28 gallons, for a total fuel capacity of 56 gallons. However, only 53 gallons of fuel can be used to prevent fuel contamination.
Yes, some Cessna 172s came with an auxiliary tank in the baggage compartment. For super long distances, special ferry tanks can be installed, but this would mean removing the rear seat and reducing baggage capacity.
You can perform the air bubble in water test to check if the vent line is open and working both ways.
If your Cessna 182 is drawing more fuel from one tank than the other, you can try switching the fuel selector to the other tank to equalize the fuel levels. You should also check the crossover vent line and ensure it is open.
