Katerina Swanson
The amount of fuel in a tank is typically measured in fractions, with 5/8 being one of them. This fraction indicates that the fuel tank is more than half full but not quite three-quarters full. In some vehicles, such as a 2008 Ford Edge, a 5/8 full fuel tank may trigger the engine light and cause the car to run roughly. Additionally, some vehicles may display a low fuel warning light when the fuel tank is at this level. While the specific amount of fuel represented by 5/8 of a tank can vary depending on the vehicle's fuel tank capacity, it generally indicates that the tank is more than half full.
| Characteristics | Values |
|---|---|
| Fuel warning light | Comes on when the tank is at 5/8 full |
| Fuel gauge | Registers 5/8 after dropping to empty |
| Fuel economy | Average mpg calculated to be 6.3 mpg |
| Fuel range | 46 miles until empty when the gauge is at 5/8 full |
| Fuel capacity | 16 gallons |
| Fuel level | E at 11-11.5 gallons |
| Refuelling | Get gas when 1/4 is left |
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What You'll Learn
Fuel warning lights
It can be stressful to see a fuel warning light come on while driving, especially when you are far from your destination. This light usually comes on when there is about 5/8 of fuel left in the tank. However, it is important to take this as a warning and fill up as soon as possible.
While some drivers may be tempted to wait for the fuel light to come on before filling up, this can be a costly mistake. Running low on fuel can cause significant damage to the fuel system, particularly the fuel pump and fuel filter. In addition, small particles of dirt and corrosion can build up in the fuel tank and be drawn into the injectors when fuel levels are low, causing blockages and reducing engine performance. This can result in costly repairs, with fuel pump replacements costing upwards of $879.
Moreover, it is illegal to run out of fuel, and you could face a fine and penalty points if you are involved in an accident due to running out of petrol or diesel. Weather conditions can also impact fuel consumption, with tires biting into snow increasing fuel consumption by up to one-third compared to driving on dry pavement. Therefore, it is recommended to keep your fuel gauge at least one-quarter full at all times to avoid these issues.
The distance you can drive once the fuel warning light comes on varies depending on the vehicle and driving conditions. Most vehicles have a range of about 30 to 50 miles from when the light comes on until the gas runs out. However, this is just an estimate, and it is always best to check your owner's manual for specific information. Additionally, smartphone apps can help you find the best gas prices and plan your route to ensure you don't run out of fuel.
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Fuel gauge accuracy
Fuel gauges in vehicles can be miscalibrated, and there may be an incorrect starting fuel amount. For example, a user with a 2020 GT reported getting a low fuel warning with a reading of 50 miles to empty when the gauge read precisely 1/4 tank. This did not make sense, as with a 16-gallon tank, 1/4 tank would be 4 gallons, and with a fuel economy of just over 19 mpg, the DTE (distance to empty) should have been 75-80 miles.
In another example, a user with a 2024 Jeep Wrangler reported fluctuations in their fuel gauge readings. Within level driving, the gauge went from reading 140kms left in the tank to 112kms left after a 24km drive to work, and then back up to 150kms left after warming the engine before driving away. This may have been due to the fuel sloshing around during all those turns, which can mess with mileage and DTE calculations.
In some cases, the fuel gauge may not be accurate due to issues with the float sending unit inside the fuel tank. This can be caused by additives in the fuel. To access the sender, the fuel tank will need to be removed.
It is important to have multiple means of cross-checking fuel levels, especially in aircraft, to prevent accidents due to fuel mismanagement.
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Fuel tank shape
A fuel tank is a container for flammable fluids, such as gasoline or diesel fuel. It is typically part of an engine system where fuel is stored and propelled or released into an engine. Fuel tanks can vary in size and complexity, from small plastic tanks in a butane lighter to the multi-chambered cryogenic Space Shuttle external tank. The most common materials for fuel tanks are metal or plastic.
Metal fuel tanks are typically made by welding stamped sheets of steel or aluminium together. They generally have the shape of a parallelepiped. Metal tanks with a single wall are the simplest to manufacture and are the most common type. Double-walled metal tanks have an extra exterior wall, creating space between the two walls to retain any fuel leaks and avoid environmental pollution.
Plastic fuel tanks are often created using blow molding, which allows for more complex shapes. Some plastic fuel tanks, such as the "ship in a bottle" design, encase all fuel delivery components, including the pump, control electronics, and hosing, within a blow-molded plastic tank. This design helps to reduce fuel vapour emissions.
The shape of a fuel tank can impact the accuracy of the fuel gauge. For example, a rectangular fuel tank will provide a more accurate reflection of the remaining fuel compared to a triangular-shaped tank, where the fuel will be used up more quickly as the volume decreases towards the bottom of the triangle.
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Fuel tank maintenance
Placement and Setup
When installing a new fuel tank, it is recommended to place it in an east-west orientation to minimise exposure to solar radiation. This simple step can help prevent long-term weathering and the potential for the tank to become brittle, reducing safety hazards. Aboveground storage tanks (ASTs) are generally preferred over underground storage tanks due to their ease of maintenance, lower environmental impact, and reduced federal regulation requirements. Ensure your AST is properly set up and complies with all federal, state, and local regulations. ASTs should only be used outdoors and should be placed away from safety hazards and direct sunlight exposure.
Regular Inspections
Regular inspections of your fuel tank are crucial to identify any issues early on. Here are some key aspects to include in your inspection checklist:
- Check for leaks: Keep the area around the tank clear of debris and vegetation to easily spot drips and spills.
- Inspect pumping equipment: Check the condition of pumps, vents, valves, and fittings weekly. A physical check for bolt tightness, paint deterioration, and the general condition of this equipment should be conducted every six months.
- Filler caps: Remove filler caps periodically and clean the threads with a wire brush. Apply lithium grease to prevent rust buildup.
- Vents and valves: Regularly inspect vents and valves to maintain proper fuel flow.
- Water-finding test: Perform a water-finding test by dipping the tank to check for water or product in the interstitial space. Remove any accumulation of rainwater, diesel, or water from the bund and secure cabinet.
- Fuel quality: Ensure the use of high-quality fuel to prevent damage to the tank and equipment.
Additional Maintenance Tips
- Fire-guarding: Fuel storage tanks should have fire-guarding or vaulting to prevent fuel ignition in case of emergencies.
- Double-walled tanks: Consider investing in a double-walled tank or including a secondary containment area to prevent leaks and spills.
- Seasonal maintenance: Be prepared to inspect your tank more frequently during harsh winters or extreme weather conditions.
By following these maintenance guidelines and staying vigilant with regular inspections, you can ensure the safe and proper functioning of your fuel tank.
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Fuel efficiency
Maintenance and Service
Proper maintenance and service can play a major role in improving fuel efficiency. A well-maintained car is a fuel-efficient car. Regular engine tune-ups can make a huge difference in your fuel efficiency, saving you time and money in the long run. The average tune-up improves fuel economy by 4%, directly saving you money. Additionally, modern cars require regular service to ensure optimum fuel economy, performance, and longevity. It is important to follow the manufacturer's recommended service schedule, which may include oil changes, transmission flushes, and other critical maintenance tasks.
Tire Maintenance
Maintaining proper tire pressure and inflation is crucial for fuel efficiency. Underinflation reduces fuel economy, degrades handling and braking, causes tires to wear more rapidly, and can lead to overheating and blowouts. Properly inflated tires, on the other hand, improve fuel economy, last longer, and are safer on the road. Check your tire pressure and keep them inflated according to the manufacturer's recommendations.
Driving Habits
Personal driving habits have a significant impact on fuel consumption. Adopting improved driving behaviors can contribute to savings at the gas pump. Some tips include slowing down and driving at a consistent speed, avoiding abrupt starts and stop-and-go driving, planning driving times to avoid heavy traffic, and combining multiple errands into one trip whenever possible. Additionally, avoid prolonged idling and unnecessary engine idling, as it wastes fuel and causes the engine to work harder.
Engine and Fuel System
Keeping your engine and fuel system in optimal condition is essential for fuel efficiency. Regularly check and replace the air filter to ensure proper air intake. Clean the mass air flow sensor to maintain accurate readings and regulate fuel injection effectively. Have the oxygen sensor checked and replaced if necessary, as a faulty sensor can cause a significant drop in fuel efficiency. Additionally, consider using the manufacturer's recommended grade of motor oil, as clean oil reduces friction and heat in the engine, improving fuel efficiency.
Other Tips
- Minimize the use of air conditioning, as it requires significant engine power and reduces fuel economy.
- Remove unnecessary and bulky items from your vehicle, as a heavier car requires more fuel to accelerate.
- Park in the shade or use a windshield sunscreen during hot weather to reduce heat buildup and minimize the need for air conditioning.
- Choose the most fuel-efficient vehicle for your journey if you own multiple cars.
- When buying a new car, look for models that offer the best fuel economy in their class.
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Frequently asked questions
It is approximately 46 miles to empty.
The low fuel warning light comes on.
You can continue driving, but fill up the tank when you get the chance.
Your car may start running very rough, and you risk sucking up crap into your filter.
No gas sensor has a linear response. They tend to drop faster in the lower half, and automakers calibrate it to stay on full for a little longer.
