Katerina Swanson
There is a lot of confusion and conflicting information regarding the legality of gravity-fed fuel tanks. While some sources claim that they are illegal, others argue that they can be made legal by following certain regulations. The Department of Transportation (DOT) regulations that pertain to gravity-fed fuel tanks are 49CFR393.65 Fuel Systems and 49CFR393.67 Liquid Fuel Tanks. These regulations outline specific requirements for fuel tank construction, fuel withdrawal fittings, and fuel flow. Environmental regulations also play a role, as leaking fuel can have a significant impact on the environment. To ensure legality, it is crucial to carefully review and adhere to all relevant regulations and safety standards.
| Characteristics | Values |
|---|---|
| Legality | Ambiguous |
| Applicable Regulations | 49CFR393.65 Fuel Systems, 49CFR393.67 Liquid Fuel Tanks |
| Requirements | Non-spill air vent, anti-sipon ball check valve, pressure relief cap, serial plate with approval stamp, shut-off valve, transfer tank with pump |
| Safety Concerns | Insufficient vapor space, pressure build-up, fuel leakage, violation of Clean Air Act, fire hazard |
| Vehicle Performance Impact | Adversely affects on-board vehicle diagnostic systems, nuisance, potential for valid vehicle issues to be missed |
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What You'll Learn
Gravity-fed fuel tanks for gasoline are illegal
Firstly, safety and legality issues can arise with gravity-fed fuel systems, potentially violating US DOT regulation 49 CFR 393.67, a requirement for all fuel systems. Gravity-fed systems can adversely affect federally mandated, manufacturer-implemented, on-board vehicle diagnostic systems. In newer vehicles, a gravity-fed system may keep the main fuel tank overfull, resulting in a diagnostic trouble code and a constantly illuminated check engine light.
Secondly, environmental regulations regarding gravity-fed fuel tanks primarily focus on leaking fuel. Insufficient vapor space in these systems can create pressure build-up in the main fuel tank, causing fuel to leak and potentially violating the 1990 Clean Air Act. Additionally, if the transfer fuel hose is damaged, fuel will continue flowing until the tank is empty, creating a hazardous situation.
Thirdly, specific regulations must be followed when installing gravity-fed fuel tanks. These include not placing fuel lines near flame or heat sources, such as the exhaust system, and not locating fuel lines outside the vehicle's body or in the interior/passenger area.
Finally, gravity-fed fuel tanks for gasoline may be illegal due to the flammability difference between gasoline and diesel fuel. Diesel fuel has a higher auto-ignition temperature than gasoline, and diesel fuel systems have a rollover valve that prevents fuel leakage in the event of a rollover.
While there may be exceptions or workarounds to these regulations, it is essential to consult official sources and legal professionals for definitive information on the legality of gravity-fed fuel tanks for gasoline.
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Diesel gravity-fed fuel tanks are legal
The legality of gravity-fed fuel tanks is a complex issue that varies depending on the specific context and jurisdiction. However, in the United States, there is some consensus that diesel gravity-fed fuel tanks are generally legal, provided certain conditions are met.
Firstly, it is important to distinguish between auxiliary fuel tanks and transfer tanks. Auxiliary tanks have the plumbing to run the engine directly from the tank without transferring fuel to the main tank. On the other hand, transfer tanks are containers used to fill with fuel, but they lack the ability to operate the engine directly. Instead, the fuel must be transferred to the main tank for use. This distinction is crucial when understanding the regulations surrounding gravity-fed fuel tanks.
According to the United States Department of Transportation (DOT) Code of Federal Regulations (CFR), there are specific sections that address gravity-fed fuel tanks: 49CFR393.65 Fuel Systems and 49CFR393.67 Liquid Fuel Tanks. While the interpretation of these regulations can be ambiguous, certain conditions can make diesel gravity-fed fuel tanks legal.
One crucial factor is the presence of an approved tank. The tank must meet certain standards and have a serial plate with an approval stamp. Additionally, diesel gravity-fed fuel tanks must not supply fuel directly to the carburetor or injector. This is an important distinction, as supplying fuel indirectly through the OEM fuel fill line is generally accepted.
Another important consideration is the inclusion of a valve in the system. A valve, preferably an emergency shut-off valve, can make the system legal and safe. This valve allows for the fuel to be shut off in case of maintenance or repairs, such as changing a fuel hose or inline filter. Additionally, a switching valve between tanks can be used to control the fuel flow and prevent overfilling.
It is worth noting that while diesel gravity-fed fuel tanks may be legal, there are safety and environmental concerns associated with their use. Insufficient vapor space in gravity-fed systems can cause pressure build-up, leading to fuel leaks. Additionally, gravity-fed systems can adversely affect on-board vehicle diagnostic systems, causing nuisance issues and potentially masking valid vehicle problems. Therefore, it is essential to carefully review and adhere to all relevant regulations, such as those outlined by the DOT and Federal Safety requirements, to ensure legal and safe usage.
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Safety and environmental concerns
The legality of gravity-fed fuel tanks is ambiguous and varies depending on location and specific use cases. However, there are several safety and environmental concerns associated with these systems that regulators aim to address through stringent standards and compliance requirements.
One of the primary safety concerns with gravity-fed fuel systems is the risk of fuel spillage during normal operations. This concern is heightened in the absence of a rollover valve, which can lead to a violation of the "overfill restriction" requirement outlined in 49 CFR 393.76(12)(i). A properly functioning rollover valve is designed to close when the fuel level reaches the float, preventing overfilling. Additionally, some rollover valves are engineered to leak above a certain pressure, meeting the "safety venting" requirements of 49 CFR 393.67(8). Capping or eliminating the rollover valve can result in non-compliance and a violation of the 1990 Clean Air Act.
Another critical safety consideration is the placement of fuel lines. Environmental regulations, such as those outlined in 49 CFR 393.65, emphasize that fuel lines should not be located near flame or heat sources, like the exhaust system. It is also imperative that fuel lines are not placed outside the body of the vehicle or in the interior/passenger area, reducing the risk of fuel exposure to occupants in the event of a leak.
To ensure compliance with safety standards and prevent fuel leaks, it is crucial to adhere to the workmanship and parts standards specified by the original equipment manufacturer (OEM) design. Additionally, fuel tanks must be clearly and permanently marked with specific information, including the manufacturer's name, manufacture date, gallon size, and compliance statements.
Furthermore, certain regulations dictate the construction and design of fuel tanks. For example, 49 CFR CH.III (393.67) specifies that fuel withdrawal fittings must be located above the normal level of fuel when the tank is full. This regulation aims to prevent fuel from being withdrawn from the bottom of the tank, reducing the risk of fuel spillage and ensuring compliance with fuel withdrawal procedures.
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Vehicle performance issues
The legality of gravity-fed fuel tanks is a complex issue, with regulations varying by jurisdiction. In the United States, the Department of Transportation (DOT) has not explicitly prohibited gravity feed fuel systems, but there are safety, environmental, and legal concerns associated with their use.
From a vehicle performance standpoint, gravity feed fuel systems can negatively impact federally mandated, manufacturer-implemented, onboard vehicle diagnostic systems. In newer vehicles, a gravity-fed system may keep the main fuel tank overfull, resulting in a diagnostic trouble code and the check engine light remaining on. This can be a nuisance and cause drivers to miss valid vehicle issues.
Additionally, gravity-fed fuel systems can impact diesel fuel systems with active Diesel Particulate Filters (DPF). During regeneration, DPF units reach temperatures of 600°C, much higher than the auto-ignition temperature of diesel fuel, which is approximately 260°C. If fuel leaks from a rollover valve in a gravity-fed system, it could come into close proximity to the DPF, creating a significant fire hazard.
To comply with safety standards and regulations, it is recommended to use a valve to control the fuel flow in gravity-fed systems. The inclusion of a valve can prevent fuel leakage and overfilling, reducing the risk of fire and bringing the system into compliance with DOT regulations.
It is important to note that the legality of gravity-fed fuel systems may vary from state to state, and it is the responsibility of vehicle owners to ensure their installations meet all applicable DOT and federal safety requirements.
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Fuel tank requirements
Markings and Labelling
Fuel tanks must be clearly and permanently marked with specific information, including the manufacturer's name, manufacture date, gallon size, and certain statements indicating compliance with regulations, such as "Meets all FMCSA requirements for non-side mounted fuel tank" and "Not to exceed 95% of capacity."
Ventilation and Spill Prevention
Each fuel tank must be equipped with a non-spill air vent, such as a ball check valve, to prevent fuel spills and leaks. The air vent may be combined with the fill-pipe cap or safety vent. Some tanks, such as those manufactured by ATTA, have multiple vents and include an anti-siphon ball check valve vent and an OEM-style pressure relief cap.
Fuel Withdrawal Fittings
The fittings through which fuel is withdrawn from the tank must be located above the normal level of fuel when the tank is full. This means that the fuel must be withdrawn from the top of the tank rather than from a fitting on the bottom. This regulation applies to all fuel tanks except diesel fuel tanks.
Safety Venting System
Fuel tanks with a capacity of more than 25 gallons of fuel must have a safety venting system to prevent internal pressure from rupturing the tank in the event of a fire. This requirement is outlined in 49 CFR § 393.67, which specifies the tests that fuel tanks must undergo to ensure the safety venting system's effectiveness.
Leakage Prevention and Testing
Fuel tanks should be designed and constructed to prevent leakage. Single-wall tanks, for example, are required to be located in a diked area that can contain 110% of the largest tank's capacity. Regular inspections, at least monthly, are necessary to identify and address potential issues like cracks, punctures, leaks, and rainwater accumulation. Additionally, leakage tests are mandated for certain types of tanks, as outlined in 49 CFR § 393.67, to ensure they meet the required performance standards.
Separation and Barriers
Fuel tanks should maintain a minimum separation distance from flammable storage tanks and buildings. OSHA 1910.106 (b)(2)(ii)(a) specifies a minimum separation of three feet for flammable storage tanks. Best practices recommend that tanks be located at least 25 feet from any building. Barriers, such as piping, concrete pillars, or wheel stops, should be installed to protect the tank and control vehicle placement near the tanks.
Compliance with Regulations
It is essential to comply with various state and federal regulations regarding fuel tanks and fuel systems. These regulations are enforced by entities such as the Environmental Protection Agency (EPA), Federal Motor Vehicle Safety Standards, Vehicle Equipment Safety Commission, National Fire Prevention Association, and the Recreational Vehicle Industry Association.
It is important to note that specific requirements may vary based on the specific jurisdiction and the type of fuel and fuel tank involved. Always refer to the relevant laws and regulations in your area to ensure compliance with all applicable standards.
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Frequently asked questions
The absolute legality of gravity-fed fuel tanks remains unclear. However, gravity-fed auxiliary fuel tanks are illegal in the US for gasoline-powered vehicles.
Gravity-fed diesel fuel tanks are legal in the US, as long as they are installed with an approved tank and meet safety standards.
Gravity-fed diesel fuel tanks must meet safety standards set by the US Department of Transportation (DOT). These include not having any fuel lines near flame or heat sources, such as the exhaust system, and not being located in the interior/passenger area of the vehicle.
Yes, in addition to DOT regulations, gravity-fed diesel fuel tanks must also comply with Federal Motor Vehicle Safety Standards (FMVSS) and regulations set by the California Air Resources Board (CARB) and the Environmental Protection Agency (EPA).
