
The legality of plastic gas tanks is a highly debated topic, with several conflicting opinions. While some claim that plastic gas tanks are not street legal and may cause issues during inspections, others argue that they have used them without any problems. The consensus is that it depends on the specific state and local laws, and whether the tank has been approved by the Department of Transportation (DOT). Some tanks explicitly state that they are for off-road use only, indicating they are not suitable for legal on-road use. However, many motorcycles come stock with plastic tanks, and some users have shared their experiences of using plastic tanks without facing any legal repercussions. The general advice is to check with local authorities, such as the DMV or safety inspectors, to confirm the legality of using plastic gas tanks in a particular region.
| Characteristics | Values |
|---|---|
| Legality | It is unclear whether plastic gas tanks are street legal. Some sources suggest that they are not street legal, while others claim that they are as long as they have been through the legal channels and the DOT approval process. |
| DOT approval | Many plastic tanks are D.O.T.-approved, but this approval seems to vary by state and local laws. |
| Stickers | Stickers do not stay on plastic tanks and begin to bubble. |
| Safety | Plastic tanks may not meet standards due to the risk of rupture. |
| Law enforcement | Law enforcement does not seem to pay much attention to bikes with plastic tanks. |
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What You'll Learn

Plastic tanks are not street legal
Plastic gas tanks are not street legal. While many motorcycles use plastic tanks, these have undergone the necessary legal channels and the DOT approval process. It is important to note that the legality of plastic gas tanks varies depending on location. In some states, such as North Carolina, there is an explicit requirement for street-legal motorcycles to have metal gas tanks. However, in other states like Arizona, there is no such requirement, and the regulations differ across regions.
The lack of street legality for plastic gas tanks is likely due to the risk of rupture. A ruptured tank on a hot engine can pose safety hazards and insurance complications. Additionally, some plastic tanks may not meet the Federal DOT design standards, which could lead to failure during state inspections. It is worth noting that while some motorcycle models have plastic shells, they have a metal gas tank underneath.
The cost of government testing and approval is often cited as a reason why smaller companies producing plastic gas tanks have not sought DOT approval. As a result, these tanks are considered “off-road use only" and are not legal for on-road use.
To ensure compliance with local laws and regulations, it is advisable to check your state and local laws, referring to the DMV or DOT website for specific information. While some riders have reported using plastic tanks without any legal repercussions, it is important to prioritize safety and adhere to the relevant guidelines in your area.
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Plastic tanks are street legal
The legality of plastic gas tanks varies depending on the location and the vehicle type. In the United States, several motorcycle owners have discussed the use of plastic gas tanks on their vehicles and whether these are street legal. While some motorcycle dealers and inspection stations claim that plastic tanks are not street legal, many motorcycle owners contest that they have never faced any legal issues due to their plastic tanks.
The consensus among motorcycle owners is that plastic tanks are not technically street legal, but law enforcement officers rarely enforce this. Owners suggest that as long as the tank looks cohesive with the rest of the bike, it is unlikely to be noticed or cause any problems. However, it is important to note that some states, like North Carolina, explicitly require street-legal motorcycles to have metal gas tanks.
The primary concern with plastic gas tanks is the risk of rupture, which could be dangerous on a hot engine. Plastic tanks that are not designed for road use may also fail to meet safety standards and could compromise insurance coverage in the event of an accident.
To ensure the street legality of a plastic gas tank, it is advisable to check with the local Department of Motor Vehicles (DMV) or the relevant state and local laws. Some sources suggest that plastic tanks must be evaluated and approved by the Department of Transportation (DOT) to be considered street legal. It is worth noting that many production bikes use plastic tanks, but these have undergone the necessary legal channels and DOT approval processes.
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D.O.T. approved plastic tanks
The legality of plastic gas tanks varies across different states and localities. While some states explicitly require street-legal motorcycles to have metal gas tanks, others do not have such requirements. It is important to check the specific laws and regulations in your state and local area.
That being said, many plastic tanks are D.O.T. (Department of Transportation) approved, but these are mostly found in low-production vehicles. D.O.T. approval for aftermarket fuel tanks is regulated by Federal D.O.T. design standards, which focus on safety and emissions. However, it is unlikely that aftermarket plastic tank manufacturers have submitted their products for D.O.T. inspection, testing, and approval due to the high costs involved in meeting the standards.
D.O.T. approval is typically obtained for a whole motorcycle, not individual components. This means that a fuel tank cannot be approved in isolation but must be a part of a complete motorcycle that undergoes the inspection process. The D.O.T. evaluates various aspects of the motorcycle, including the positioning and functionality of components such as taillights, reflectors, and brake hoses.
To identify a D.O.T.-approved fuel tank, you can look for D.O.T. approval numbers on the tank. However, it is worth noting that these numbers are typically found on other regulated items like tires, lights, and rims, and may not always be present on fuel tanks. Additionally, D.O.T.-approved containers are often used for the safe transportation of hazardous materials, and these containers must adhere to specific codes and requirements to ensure compliance with D.O.T. regulations.
While plastic gas tanks may not be explicitly prohibited in some states, it is worth noting that metal tanks are inherently impermeable and, therefore, more environmentally friendly. Plastic tanks, on the other hand, may release higher levels of hydrocarbons and contribute to increased harmful emissions.
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State inspection requirements
The legality of plastic gas tanks varies depending on the state and local laws. In North Carolina, for example, there is an explicit requirement that street-legal motorcycles have a metal gas tank, while in Arizona, there is no such requirement.
Some plastic gas tanks are not street legal because they have not gone through the necessary testing and approval processes. The Department of Transportation (DOT) approval process is required for any production vehicle, and while many plastic tanks on production bikes have been through this process, some have not due to the high costs involved. As a result, these tanks are marketed as "off-road use only" and are not DOT approved, making them illegal for on-road use.
However, it is worth noting that in over 20 years of working in motorcycle shops and riding dual sports, one user has never heard of anyone having legal issues due to a plastic tank. Another user mentions that they had a plastic tank on their bike all summer and passed by plenty of cops without any issues.
To ensure compliance with state and local laws, it is recommended to check the specific statutes on the DMV or DOT website for your state and local area.
Regarding state inspection requirements, it is important to note that some states may have specific regulations for plastic gas tanks. While the focus here is on street-legal requirements, the inspection process may involve additional considerations. Here are some general insights into state inspection requirements for fuel tanks:
- The Environmental Protection Agency (EPA) conducts inspections of underground storage tank (UST) facilities to ensure compliance with leak detection systems and regulations. Non-compliance can result in penalties and fines.
- The EPA and the American Petroleum Institute (API) set industry standards and regulations for underground gas tanks, addressing safety, construction, and operation.
- Underground gas tanks are typically made from concrete and steel, but there is a growing preference for fiberglass-reinforced plastic (FRP) due to its corrosion resistance and lower maintenance requirements.
- Inspections of underground gas tanks should be conducted at least once every five years to ensure safety and compliance.
- Visual inspections of underground gas tanks involve using probes and sensors to identify signs of damage and detecting leaks by monitoring for any liquid or vapor around the tank.
- Additional techniques, such as periodic tightness testing and vapor monitoring, may be necessary for a comprehensive evaluation of underground gas tanks.
- Choosing a qualified tank testing service with relevant qualifications and certifications is essential to ensure accurate inspections and compliance with state and federal regulations.
- Fuel tanks must adhere to specific marking requirements, including the manufacturer's name, manufacture date, gallon size, and compliance with FMCSA requirements for non-side-mounted fuel tanks.
- The fuel connections from the auxiliary fuel tank to the primary system must not render any functions of the primary system inoperative, and the auxiliary fuel tank lines, fittings, valves, and connections must be of a similar size to the primary system to ensure proper fuel flow.
While the above points provide a general overview of state inspection requirements for fuel tanks, it is important to remember that specific regulations may vary depending on your location. Therefore, it is always advisable to consult the relevant state and local authorities for the most accurate and up-to-date information regarding inspection requirements in your area.
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Metal tanks vs. plastic tanks
The legality of plastic gas tanks varies depending on the location and the vehicle. In the United States, some states, like North Carolina, have an explicit requirement that street-legal motorcycles have a metal gas tank, while other states, like Arizona, do not have this requirement. Similarly, in the UK, some motorcycles come stock with plastic tanks, while others require a D.O.T.-approved metal tank. It is important to check the specific laws and regulations in your area to determine the legality of plastic gas tanks.
Now, let's compare metal tanks and plastic tanks in terms of their features and applications:
Metal Tanks:
Metal tanks, typically made from mild steel, offer several advantages. They are durable and long-lasting, capable of withstanding extreme weather conditions, including high winds, heavy rains, and even earthquakes. Stainless steel tanks are also fire-resistant, making them ideal for areas prone to wildfires. Additionally, metal tanks are resistant to pests and rodents, which can be an issue with plastic tanks. They are adaptable and offer flexibility in terms of different capacities. Steel tanks can be hand-fabricated to specific sizes or shapes, making them suitable for various applications. However, one of the main disadvantages of metal tanks is their weight, which can make them challenging to transport and install. Metal tanks are also susceptible to rust and corrosion if they are not properly maintained, leading to potential leaks and water quality issues. Stainless steel tanks, in particular, can be expensive and challenging to manufacture.
Plastic Tanks:
Plastic tanks, on the other hand, are known for their lightweight construction, making them easier to transport and install. They are generally less expensive than metal tanks, making them a more budget-friendly option. Plastic tanks are also resistant to rust and corrosion, requiring less maintenance than their metal counterparts. However, one of the significant disadvantages of plastic tanks is their susceptibility to UV rays, which can cause them to degrade, crack, and leak over time. Plastic tanks are also less durable than metal tanks and may need to be replaced more frequently. Additionally, as plastic tanks have mechanical joints, continual contact with vapors and fluids can weaken these joints over time. The recyclability of plastic tanks is also a concern, as many end up in landfills due to the challenges of recycling this material.
In summary, the choice between metal and plastic tanks depends on specific needs and budgets. Metal tanks offer durability, longevity, and resistance to extreme conditions, while plastic tanks provide a lightweight, low-maintenance, and cost-effective alternative, albeit with potential trade-offs in terms of durability and environmental impact.
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Frequently asked questions
The legality of plastic gas tanks varies by state. While some states explicitly require motorcycles to have metal gas tanks, others do not have such requirements. It is important to check the specific laws and regulations in your state.
One of the main concerns is the risk of rupture, especially when used with a hot engine. Additionally, plastic tanks may not have undergone the necessary testing and approval processes, such as DOT (Department of Transportation) approval, to ensure their safety and legality for on-road use.
You can check your state's DMV (Department of Motor Vehicles) website or contact your local DMV office to inquire about the specific laws and regulations regarding the use of plastic gas tanks. It is also advisable to consult with a safety inspector or refer to the manufacturer's instructions to ensure the tank is approved for on-road use.






































