
The use of auxiliary fuel tanks is a highly regulated area, with rules varying between states. In Texas, the use of auxiliary fuel tanks is permitted, but only if they meet specific requirements. These requirements are set by the Texas Department of Public Safety and include factors such as secure mounting, leak prevention, and capacity limits. For example, the combined capacity of all fuel tanks in a vehicle cannot exceed 119 gallons. Other regulations specify that fuel tanks must be clearly and permanently marked with the manufacturer's name, manufacture date, gallon size, and a warning against filling the tank to more than 95% of its capacity.
| Characteristics | Values |
|---|---|
| Fuel tank marking | Fuel tanks must be clearly and permanently marked with the manufacturer's name, manufacture date, gallon size, and a warning against filling it to more than 95% of its capacity. |
| Fuel connections | The auxiliary fuel tank lines, fittings, valves, and connections shall be of a size at least equal to the primary system. |
| Fuel tank tests | Each liquid fuel tank must pass safety venting and leakage tests. |
| Fuel tank capacity | The combined capacity of all fuel tanks cannot exceed 119 gallons. |
| Fuel tank installation | A construction notification form must be submitted a minimum of 30 days before installation, and the TCEQ office must be contacted within 72 hours of beginning work. |
| Fuel delivery | A registration form must be submitted within 30 days of receiving the first fuel delivery, and a fuel carrier will need to see this registration after the 90-day grace period. |
| Fuel spills and leaks | All leaks and spills of more than 25 gallons must be reported, and any spill that cannot be cleaned up within 24 hours must also be reported. |
| Fuel transfer | Manually pumping from an auxiliary tank to the main tank is possible but can be inconvenient. Gravity feed setups are allowed and do not require additional components. |
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What You'll Learn
- Texas allows auxiliary fuel tanks if they meet requirements set by the Texas Department of Public Safety
- Tanks must be securely mounted and not leak
- The combined capacity of all fuel tanks cannot exceed 119 gallons
- Tanks must be clearly and permanently marked with the manufacture's name, manufacture date, and gallon size
- Fuel tanks must pass liquid fuel tank tests

Texas allows auxiliary fuel tanks if they meet requirements set by the Texas Department of Public Safety
Texas permits the use of auxiliary fuel tanks as long as they meet the requirements set by the Texas Department of Public Safety. The tanks must be securely mounted and cannot leak. In addition, gravity-fed tanks are allowed. There is also a limit on the combined capacity of all fuel tanks, which must not exceed 119 gallons.
If you are considering installing an auxiliary fuel tank in Texas, it is important to be aware of the specific requirements and regulations. Firstly, the tank must be marked with a warning, stating that it should not be filled to more than 95% of its capacity. This is a standard requirement for liquid fuel tanks across the US, as per the Electronic Code of Federal Regulations.
In Texas, the TCEQ (Texas Commission on Environmental Quality) is the regulator for ASTs (Above Ground Storage Tanks) with a capacity of over 1100 gallons of petroleum products. If you are installing a new AST or replacing an existing one, you must submit a construction notification form to the TCEQ at least 30 days in advance. You must also contact the TCEQ office within 72 hours of beginning the work. Additionally, you will need to keep records for the life of the system, including a temporary delivery authorization and a certificate of registration for receiving fuel deliveries.
There are also specific requirements for the fuel connections and auxiliary fuel tank lines. The connections from the auxiliary tank to the primary system must not render any functions of the primary system inoperative. The auxiliary fuel tank lines, fittings, valves, and connections must be of a size equal to or larger than the primary system to ensure adequate fuel flow.
It is important to note that the regulations for auxiliary fuel tanks can vary from state to state in the US. Therefore, if you are travelling to other states or intend to cross state lines, it is crucial to research the specific regulations for each state. Some states may prohibit auxiliary tanks altogether, while others may have specific requirements such as mounting, capacity limits, or labelling.
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Tanks must be securely mounted and not leak
In Texas, auxiliary fuel tanks are permitted as long as they meet specific requirements. One of the critical requirements is that the tanks must be securely mounted and must not leak. This is to ensure the safety of the vehicle and prevent environmental hazards.
The Texas Commission on Environmental Quality (TCEQ) regulates above-ground storage tanks (ASTs) with a capacity of over 1,100 gallons that contain petroleum products. If you plan to install an AST, you must submit a construction notification form to the TCEQ at least 30 days in advance and keep detailed records. Additionally, you must register your tank within 30 days of receiving your first fuel delivery, and a fuel carrier will need to see this registration to deliver fuel after 90 days.
To ensure that auxiliary fuel tanks do not leak, several precautions must be taken. Firstly, the tanks must be appropriately marked with a warning against filling them beyond 95% of their capacity. This is to prevent overfilling, which can lead to fuel spillage during normal fuel expansion. Additionally, the tanks must undergo leakage tests to ensure they meet the required standards. These tests involve filling the tank with fuel or water and then performing specific procedures to check for leaks.
To achieve a secure mounting, some individuals opt for gravity-fed auxiliary fuel tanks, which are permitted in Texas. These tanks use gravity to feed fuel from the auxiliary tank to the main tank, eliminating the need for manual pumping. However, it is important to note that gravity-fed systems may require additional components, such as valves and fittings, to control the fuel flow and prevent overfilling.
Overall, ensuring that auxiliary fuel tanks are securely mounted and do not leak is crucial for safety and environmental reasons. By following the regulations set by the Texas Department of Public Safety and the TCEQ, individuals can safely install and use auxiliary fuel tanks in their vehicles.
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The combined capacity of all fuel tanks cannot exceed 119 gallons
In Texas, the use of auxiliary fuel tanks is permitted, but they must meet specific requirements set by the Texas Department of Public Safety. One of the critical requirements is that the combined capacity of all fuel tanks in a vehicle cannot exceed 119 gallons. This regulation is designed to ensure that vehicles carrying additional fuel do not exceed a certain fuel capacity for safety reasons.
The 119-gallon limit is a crucial threshold that vehicle owners must not surpass. If a vehicle has multiple fuel tanks, including auxiliary ones, the total volume of fuel they can hold must not go over this limit. This regulation is in place to prevent vehicles from carrying excessive amounts of fuel, which could pose safety hazards in the event of a collision or other incidents.
It's important to note that the 119-gallon limit is not the only restriction on auxiliary fuel tanks in Texas. There are additional requirements that must be adhered to. For example, the tanks must be securely mounted and cannot leak. This is to ensure that the fuel is safely contained within the vehicle and does not pose a risk of leakage during transportation.
Furthermore, the Texas regulations also specify that gravity-fed auxiliary fuel tanks are permitted. This means that the auxiliary tank can be designed to supply fuel to the engine using gravity, without the need for additional pumps. However, even with gravity-fed systems, the combined capacity restriction of 119 gallons still applies.
Vehicle owners in Texas who wish to install auxiliary fuel tanks should be mindful of these regulations. It is essential to comply with the capacity limits and other requirements to ensure the safety of the vehicle and its occupants. Failing to adhere to these regulations may result in legal consequences and put the vehicle, its passengers, and other road users at risk.
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Tanks must be clearly and permanently marked with the manufacture's name, manufacture date, and gallon size
In Texas, the Texas Commission on Environmental Quality (TCEQ) regulates above-ground storage tanks (ASTs) with a capacity of over 1,100 gallons that contain petroleum products. Tanks that fall under this category must comply with specific requirements, including registration and reporting procedures.
If you are installing an auxiliary fuel tank in Texas, it is essential to understand and adhere to the regulations outlined by the Texas Department of Public Safety. One of the critical requirements for auxiliary fuel tanks in Texas is that they must be clearly and permanently marked with specific information.
The tanks must bear the manufacturer's name, the manufacturing date, and the gallon size. This marking ensures that the tank's capacity is evident and that it complies with any applicable capacity restrictions. For example, in Texas, the combined capacity of all fuel tanks on a vehicle cannot exceed 119 gallons.
Additionally, the marking must include a statement indicating that the tank meets all FMCSA (Federal Motor Carrier Safety Administration) requirements for non-side-mounted fuel tanks. This statement ensures that the tank complies with federal safety standards, which are crucial for the safe operation of the vehicle.
The marking on the auxiliary fuel tank also serves as a form of identification for the manufacturer, providing traceability in the event of any issues or recalls. The manufacturing date is also essential for determining the applicability of specific regulations, as fuel tank regulations may change over time.
By clearly and permanently marking auxiliary fuel tanks with the required information, vehicle owners in Texas can ensure they comply with state and federal regulations. It is important to consult with local authorities or legal professionals to understand the specific requirements and ensure that your auxiliary fuel tank setup is legal and safe.
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Fuel tanks must pass liquid fuel tank tests
In Texas, the Texas Commission on Environmental Quality (TCEQ) regulates Above Ground Storage Tanks (ASTs) with a capacity of over 1100 gallons that contain petroleum products. If you want to install an AST, you must submit a construction notification form to the TCEQ at least 30 days before beginning work. After receiving your first fuel delivery, you must send in a registration form within 30 days. The TCEQ will then provide a certificate of registration.
The integrity fuel tank storage test begins with a visual inspection of the outside of the tank for signs of corrosion, discharge, accumulation of fuel, and general deterioration. This includes inspecting the tank's foundation and support structures. The Environmental Protection Agency (EPA) states that these visual inspections should be ongoing and performed regularly. The frequency of testing and inspections depends on the type of fuel tank and can be determined by referring to the SPCC plan.
It is important to note that the government does not specify how often tanks should be tested, so it is up to the owner to determine a testing schedule. However, the EPA requires that testing and inspection records be retained for at least three years. Regular testing and maintenance of fuel tanks are crucial to minimize the risk of failure, avoid costly hazardous clean-up, and ensure the safety of your equipment and fleet.
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Frequently asked questions
Yes, Texas allows auxiliary fuel tanks as long as they meet certain requirements set by the Texas Department of Public Safety.
The tank must be securely mounted and cannot leak. Gravity-fed tanks are permitted, but they must be plainly marked with a warning against filling them to more than 95% of their capacity. The combined capacity of all fuel tanks cannot exceed 119 gallons.
The TCEQ regulates ASTs with a capacity of over 1100 gallons that contain petroleum products. If you plan to install an AST, you must submit a construction notification form at least 30 days in advance and keep records for the life of the system. You will also need to register and receive a certificate before receiving fuel deliveries.
You must maintain records such as the application for approval of the AST, temporary delivery authorizations, and certificates of registration. It is also mandatory to report leaks and spills of more than 25 gallons or those causing a sheen on water.
The tank cannot stick up over the top of the bed rails. Additionally, the fuel connections and selector valve for the auxiliary tank must not interfere with the normal functions of the primary fuel system.









































