Sylvie Willis
There are varying estimates of how much gas is left in a fuel pump hose after use. Some sources claim that there is about a third of a gallon of fuel left, which equates to approximately four to five cups of gas. This is supported by a gas pump technician who states that you are getting 1-2 quarts of what's left in the hose. However, other sources claim that there is far less gas left, with one source claiming that there is only 0.1L left in the nozzle, which is about 0.026 gallons or 7.2 cents worth of gas. Another source claims that there is no fuel left in the line, and that what doesn't drain out after clicking the pump siphons back.
| Characteristics | Values |
|---|---|
| Amount of gas left in the hose | 1/3 of a gallon or 1-2 quarts |
| Amount of gas left in the nozzle | 0.1L or 0.026 gallons |
| Amount of gas left in the hose and nozzle | 7/128 gallon or about 5% of a gallon |
| Amount of gas left in the hose in cups | 4-5 cups |
| Whether gas is left in the hose | Yes, but it is a very small amount |
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What You'll Learn
- Gas pump hoses typically retain about a third of a gallon of fuel
- The amount of fuel left in the hose varies from 1/3 gallon to 2 gallons
- Lifting the hose after filling ensures extra fuel is obtained
- Gas pumps have separate lines to the top where they join the hose
- The gas hose length can impact the amount of fuel retained
Gas pump hoses typically retain about a third of a gallon of fuel
The amount of residual fuel in the hose can vary, with some sources claiming up to 2 gallons of fuel could be left in the hose. This can result in receiving a lower octane of fuel than what you paid for, as the leftover fuel from the previous customer gets mixed in with your purchase. For example, if you paid for premium fuel but the previous customer purchased regular, your fuel may be diluted with regular gas left in the hose.
To avoid this issue, some individuals choose to pump the first half-gallon of fuel into a trash barrel to ensure they are only receiving the octane level they paid for. Others have suggested lifting the hose up after filling to ensure you get any extra fuel that may be in the hose. However, it is important to note that the amount of fuel gained from this practice is minimal, and may not be worth the effort.
State inspectors monitor gas stations to ensure consumers are getting the octane they pay for at the pump. Octane levels are tested at every gas station twice a year, and stations are warned to fix any issues that may result in customers receiving diluted fuel. Therefore, while gas pump hoses do retain some fuel, it is not a significant cause for concern as measures are in place to protect consumers from receiving diluted or incorrect octane levels.
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The amount of fuel left in the hose varies from 1/3 gallon to 2 gallons
The amount of fuel left in the hose of a gas pump varies from one-third of a gallon to two gallons. This means that when someone pumps one gallon of high-octane fuel, they may end up with a mix that includes some regular gas from the previous user. This is due to the gas left in the hose, which can be up to two gallons, depending on the length of the hose.
Some people try to take advantage of this by lifting the hose up after filling their tank to ensure they get extra fuel. This practice is not recommended, as it only yields a tiny amount of fuel, and it is illegal in some places.
The amount of fuel left in the hose can be a concern for those with vehicles that are particular about the type of gas they use. For instance, a motorcycle owner mentions that their Super Duke 1290 stalls when filled up with regular gas from a station that doesn't have separate pumps for premium fuel. However, others note that the amount of fuel left in the hose is usually not enough to cause such issues, and inspectors in every state monitor gas stations to ensure consumers get the octane they pay for.
The variation in the amount of fuel left in the hose can be attributed to several factors, including the length of the hose and the design of the pump. Some pumps may use pressure to ensure that all the gas is pumped into the car tank, leaving none in the hose. Additionally, the gas-pump hose typically retains about one-third of a gallon of fuel, according to the American Petroleum Institute.
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Lifting the hose after filling ensures extra fuel is obtained
Lifting the hose after filling your tank with fuel is a common practice, especially with the rising costs of fuel, as people want to ensure they get every last drop. The idea is that lifting the hose will drain any residual fuel into your tank, giving you extra fuel.
However, the effectiveness of this practice is questionable. Some people claim that lifting the hose doesn't really get you much extra fuel, only the last few drops left in the nozzle. These days, modern fuel bowsers have safety systems with fluid lock-off valves that prevent fuel from coming out when the pump isn't operating. So, while you might see a couple of leftover drops come out of the nozzle, the fuel in the hose remains trapped.
Additionally, the pump's calibration is designed to measure what is delivered out of the nozzle, ensuring that the fuel you paid for isn't trapped in the hose. Therefore, the amount of extra fuel gained by lifting the hose is likely negligible.
Nevertheless, some people still advocate for lifting the hose and giving it a shake to get those last few drops, especially for smaller vehicles like mopeds, where even a tiny bit of extra fuel can make a difference.
It is worth noting that there are other ways to maximize your fuel efficiency and save money. These include driving smoothly, avoiding hard acceleration and braking, keeping your tires properly inflated, and regularly servicing your vehicle. Additionally, petrol prices tend to fluctuate, so it can be strategic to fill up your tank when prices are lower.
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Gas pumps have separate lines to the top where they join the hose
There are a few things you can do to try to get around this issue. One is to find a gas station that has individual hoses for different fuel types. These are common in Japan and some parts of the United States. Another option is to pump the first half-gallon of gas into a trash barrel, as this is likely to be the leftover fuel from the previous person. You can also try lifting the hose up after filling to get any extra fuel that is in the hose. However, this is not very effective, as the only extra gas you're getting out is the last few drops left in the nozzle.
It's important to note that the amount of gas left in the hose is relatively small, and it may not be worth worrying about unless you have a very small tank or are particularly concerned about getting exactly the right type of gas. Additionally, the gas left in the hose is metered, so you are not being charged for any extra gas that may be left in the hose.
While it may not be a huge issue, it is still something to be aware of when filling up your vehicle, especially if you have a vehicle that is particular about its fuel. By taking some simple steps, you can minimize the impact of any leftover gas in the hose and ensure that you are getting the type of gas you need.
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The gas hose length can impact the amount of fuel retained
The length of a hose can affect the flow rate of fluids passing through it. This is due to the increased viscous effects, such as drag and friction, between the hose and the fluid. As a result, for a constant inlet pressure, a longer hose will result in lower velocities and a lower flow rate.
Similarly, the length of a gas hose can impact the amount of fuel retained in it. According to the American Petroleum Institute, a gas pump hose typically retains about one-third of a gallon of fuel. This can vary, with some sources claiming that up to two gallons of fuel may be left in the hose. This can lead to a mixture of fuel grades when the next user pumps gas, as the leftover fuel from the previous user gets mixed with the new fuel.
The impact of hose length on the amount of retained fuel is influenced by the increased surface area and volume of a longer hose. This provides more space for fuel to remain in the hose after each use. Additionally, the curvature and flexibility of the hose can create pockets where fuel can collect, further increasing the amount of retained fuel.
The length of the hose can also affect the accuracy of the fuel pump meter. A longer hose may result in a greater discrepancy between the metered amount and the actual amount of fuel dispensed, due to the increased fuel retention in the hose. This can be a concern for users who require precise measurements of fuel, especially when dealing with high-performance engines that require specific fuel grades or octane ratings.
To mitigate the impact of hose length on fuel retention, some gas stations employ individual hoses for different fuel types. This eliminates the issue of fuel mixing and ensures that users receive the correct grade of fuel. Additionally, the use of separate lines for each fuel type within the pump can reduce the amount of fuel retained in the hose, providing a more accurate measurement for the user.
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Frequently asked questions
According to the American Petroleum Institute, a gas pump hose typically retains about one-third of a gallon of fuel. However, some sources claim that there is no fuel left in the line, and that what doesn't drain out after clicking the pump siphons back.
Yes, if the previous customer filled up with regular or mid-grade gas and you're pumping premium, you will get a mix of the two. However, inspectors in every state monitor gas stations to ensure consumers get the octane they pay for, and octane levels are tested at every gas station twice a year.
Some people lift the hose up after filling to get the extra fuel, but this only gets you a tiny amount, and it doesn't work if the nozzle is closed.
