Rajan Wilcox
The Mazda Miata is a popular vehicle for racing and casual driving. However, there is some confusion regarding the fuel tank capacity of the 1999 model. Some sources claim that the tank capacity is 12.7 gallons, while others suggest it may hold closer to 13 gallons. There are also reports of fuel gauges acting erratically, making it difficult to accurately assess the amount of fuel in the tank. Additionally, the absence of a fuel light in older models adds to the challenge of monitoring fuel levels. Nevertheless, with reported mileage ranging from 9 mpg to over 300 miles per tank, the Miata remains a versatile choice for enthusiasts.
| Characteristics | Values |
|---|---|
| Fuel tank capacity | 11.52 gallons- 13 gallons |
| Fuel tank capacity (official) | 12.7 gallons |
| Fuel gauge behaviour | Non-linear |
| Fuel efficiency | 9 mpg |
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What You'll Learn
- The 1990-1997 Mazda Miata's fuel tank capacity is 12.7 gallons
- The fuel gauge is non-linear, making it hard to know the exact amount of fuel left
- Fuel tank replacement is a challenging task, requiring careful removal and installation
- Modifying the fuel tank capacity for racing can impact performance and legality
- Fuelly and similar apps can help track mileage and mpg without a full fuel-up
The 1990-1997 Mazda Miata's fuel tank capacity is 12.7 gallons
The fuel tank capacity of the 1990-1997 Mazda Miata is 12.7 gallons. This information is specifically relevant to those looking to replace their fuel tank, as the 1990-1993 models originally had an 11.7-gallon capacity.
Some sources suggest that the tank holds a little more than 12 gallons, with one source stating that they were able to fit 13 gallons in their Miata. However, it is important to note that gas gauges are not always exact, and the way the car is tilted can affect the accuracy of the gauge.
For those looking to measure their miles per gallon (mpg), it is recommended to fill the tank completely and then drive until the next fill-up. This can be done without running the tank empty, as some sources suggest that there are still 3-5 gallons left in the tank when the gauge reads 'E'.
When it comes to replacing the fuel tank of a 1990-1997 Mazda Miata, it is a two-person job that requires a jack to lift the car, an impact gun, and various other tools to remove and replace the tank. It is also important to note that the fuel pump does not need to be removed during this process.
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$91.99 $99
The fuel gauge is non-linear, making it hard to know the exact amount of fuel left
The 1999 Mazda Miata is equipped with a plastic fuel tank that can hold up to 45 litres (11.9 gallons) of fuel. While this may seem like a modest amount, it is worth noting that the Miata is renowned for its fuel efficiency, often achieving an impressive 26 mpg in the city and 33 mpg on the highway.
One peculiar aspect of the Miata's fuel system is the non-linear behaviour of the fuel gauge. Unlike traditional linear gauges that depict fuel levels with proportional accuracy, the Miata's fuel gauge can be somewhat enigmatic. The gauge may depict a rapid descent initially, only to linger endlessly in the lower half, making it challenging for drivers to accurately discern the precise quantity of fuel remaining in the tank.
This non-linear behaviour can be attributed to the design of the fuel tank and the sending unit within it. The sending unit is responsible for measuring the fuel level and relaying this information to the gauge. In the case of the Miata, the sending unit may not be providing a linear output, resulting in the peculiar gauge behaviour.
There are a few potential explanations for this non-linearity. One possibility is that the sending unit could be designed to provide more accurate readings at certain levels, resulting in a non-uniform scale. Alternatively, the shape of the fuel tank itself could be a contributing factor. If the tank has an irregular shape, with varying depths, it can affect the rate at which the fuel level descends, thereby influencing the gauge reading.
Despite the non-linear behaviour of the fuel gauge, the Miata is equipped with a low fuel warning light that illuminates when the fuel level reaches a certain threshold, providing drivers with a clear indication to refuel soon. Additionally, given the car's fuel efficiency and the capacity of the tank, even when the gauge reads low, there is still a considerable amount of driving distance left before running out of fuel.
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Fuel tank replacement is a challenging task, requiring careful removal and installation
Firstly, it is essential to prepare the car for the fuel tank replacement. Start by disconnecting the battery to ensure safety and prevent any electrical issues. Use jack stands to lift the car to a comfortable working height, providing ample space to access the fuel tank. Place a gas can and funnel beneath the gas tank drain to catch any remaining fuel when you open the drain.
The next step is to carefully drain the fuel tank. Locate the 17mm bolt on the gas tank drain and remove it using the appropriate tool. Allow the fuel to drain completely into the gas can. It is important to handle fuel with caution and ensure proper ventilation during this process.
Once the tank is drained, the removal process can begin. Start by removing the upper strut nuts located in the trunk, typically requiring a 14mm socket. Then, detach the electrical cable connected to the PPF by carefully undoing the clips with needle-nose pliers. Remove the 10mm bolt that secures the electrical cable to the PPF, along with any other clips attached to it. Ensure that you do not need to remove the PPF from the differential, only from the transmission end.
Continue by removing the PPF bolts from the transmission end with a 17mm socket. The hard brake line must also be detached from the block on the passenger side, typically requiring a 10mm line wrench. Remove the emergency brake cables from both calipers using two 14mm wrenches.
At this point, it is crucial to ensure that the differential is adequately supported. Use a large jack, rated for 2.5-3 tons, to hold the weight of the differential without lifting the car off the jack stands. Position the jack to support the differential securely.
Now, you can focus on the fuel tank itself. Remove the clamps securing the hoses to the tank, both the big hose and the smaller one. You can use the metal filler tube for leverage to detach the rubber hoses from the tank effectively. Disconnect all hoses and the electrical connector, but there is no need to remove the fuel pump.
Finally, remove the bolts holding the gas tank in place, typically four 12mm bolts. Be cautious, as there may be a hook-like metal part holding the tank in place on the driver's side. With patience and careful manipulation, you can clear this obstacle and remove the fuel tank.
The installation process involves carefully reversing these steps, ensuring that all connections are secure and proper. It is a challenging task, and it may be beneficial to have a second person assisting, especially when positioning and securing the new fuel tank. Always take your time and refer to a repair manual if needed to ensure a safe and successful fuel tank replacement.
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Modifying the fuel tank capacity for racing can impact performance and legality
The fuel tank of a 1999 Miata has a capacity of around 12.7 gallons. While it is possible to modify the fuel tank capacity for racing, it is important to consider the impact on both performance and legality.
Modifying the fuel tank capacity can impact performance in several ways. Firstly, a larger fuel tank can provide extended fuel capacity, reducing the need for frequent refuelling during endurance racing. This can be advantageous in terms of race strategy and maintaining consistent performance over extended durations. However, a larger fuel tank also adds weight to the vehicle, which can negatively affect acceleration, handling, and overall speed. Therefore, it is crucial to strike a balance between fuel capacity and weight considerations to optimize performance.
Additionally, modifications to the fuel tank capacity can affect fuel economy. Increasing the fuel tank size can improve fuel economy by reducing the frequency of refuelling stops, which is particularly beneficial for long-distance racing. On the other hand, a smaller fuel tank may encourage more efficient fuel usage and contribute to weight reduction, resulting in improved fuel economy.
Safety is a critical aspect of racing, and modifications to the fuel tank capacity must comply with strict regulations to ensure legality. Racing fuel cell tanks often incorporate safety features such as safety bladders, anti-slosh foam, and robust casings. Safety bladders are pliable linings designed to prevent fuel leakage in the event of collisions, while anti-slosh foam minimizes fuel agitation to ensure consistent fuel dispersal. Robust casings made from materials like aluminum or composites provide additional protection to the fuel cell from external impacts.
It is important to note that racing organizations, such as NASCAR and Formula 1, have comprehensive rule books and stringent regulations governing fuel-related safety requirements. These regulations aim to minimize the risk of fires and protect drivers in the event of crashes. For example, NASCAR mandates the use of "crash-worthy" fuel cells that can withstand significant impact forces, similar to those experienced by helicopters in a crash. Formula 1 regulations, governed by the Fédération Internationale de l'Automobile (FIA), require fuel tanks to be constructed as single rubber bladders housed within a strong composite structure for added protection.
Therefore, when modifying the fuel tank capacity for racing, it is essential to consider the performance implications, including weight distribution and fuel economy, as well as adhere to the safety and legality standards set by the relevant racing authorities.
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Fuelly and similar apps can help track mileage and mpg without a full fuel-up
Fuelly is a highly-rated app that helps you calculate your vehicle's fuel economy. It allows you to track your gas mileage over time, monitor changes to your driving habits, and keep tabs on the health of your vehicle. The app seamlessly integrates with Fuelly.com, a website for tracking gas mileage. With Fuelly, you can easily manage multiple vehicles and log each fuel-up by adding the miles, gallons, and price per gallon to see your MPG data. The app also allows you to set customizable reminders for maintenance tasks such as oil changes and tire rotations, helping you stay on top of your vehicle's maintenance.
While Fuelly offers a free version, some users have noted that the ads can be intrusive, and the free version may lack certain features compared to rival apps. For more functionality, Fuelly offers paid versions at £9.99 a year or £17.99 for a lifetime subscription.
Similar apps that can help track mileage and MPG include Drivvo, FuelTracker, Roadtrip MPG, Gas Manager, and Fuelio. Drivvo is a feature-rich app that allows you to record various motoring costs, including servicing and repairs, in addition to fuel expenditure. It offers imperial or metric units and is available for both iPhone and Android users for free. FuelTracker is a simple app that provides a no-frills experience, displaying only the essential information. Roadtrip MPG is another straightforward app, while Gas Manager is noted for its functionality for UK drivers. Fuelio is a highly recommended app for Android users, offering a simple, effective, and attractive way to track fuel consumption, prices, and mileage. It also provides reminders for maintenance tasks and allows data backup to Google Drive.
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Frequently asked questions
The fuel tank of the 99 Miata has a capacity of around 12 gallons. However, some users have reported variations, with tanks holding up to 13 gallons.
Yes. The fuel gauge in the 99 Miata can be non-linear, showing a full tank even after driving for a considerable distance. It may also show the tank as half-full when there is more fuel remaining.
No, the Miata models from the early 2000s did not have fuel lights. Fuel lights were introduced in the 2003 or 2004 models.
The frequency of filling up the tank depends on your driving habits and usage. Some users have reported driving up to 335 miles before refilling, while others have mentioned filling up after around 200 miles.
Yes, it is possible to replace the fuel tank in the 99 Miata. However, it can be a challenging process, as some users have mentioned in their reviews. Ensure you follow the guidelines and regulations, especially if you plan to use it for racing events.
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