
Auxiliary fuel tanks are additional fuel tanks that can be installed in vehicles to provide extended driving range and peace of mind in emergency situations. The installation process typically involves mounting the tank securely in the vehicle, ensuring safe connections to the factory fuel tank, and following instructions and safety precautions specific to the type of fuel and vehicle. While some individuals choose to install auxiliary fuel tanks themselves, there are also professional installers and companies specializing in fuel tank installations, offering services and kits to ensure proper and safe integration.
| Characteristics | Values |
|---|---|
| Installation | Transfer Flow Inc. offers installation at their factory in Chico, 90 miles north of Sacramento. They also have a network of 200 authorized installers throughout the US and Canada. |
| Installation kits | Fuel Shotz and Midway Tanks offer installation kits for diesel and gasoline auxiliary tanks, respectively. |
| Installation process | The process involves ensuring sufficient workspace, removing items from the truck bed, marking and drilling holes, and fastening the tank with bolts, nuts, and washers. It is recommended to have an extra set of hands for assistance. |
| Placement | The tank should be installed away from the sides, front, and back of the bed to prevent rubbing and potential damage. |
| Safety | It is important to ensure proper safety measures, such as creating a steel firewall and sealing off the area when installing an auxiliary fuel tank. |
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What You'll Learn

Installation kits for auxiliary fuel tanks
Auxiliary fuel tanks require installation kits to connect to your truck's factory fuel tank. Diesel tanks require a Fuel Shotz Install Kit, and gasoline tanks require a Universal Gasoline Install Kit. These kits are designed for simple installation, and you can expect to have your new tank installed in less than an hour. The Fuel Shotz installation kit connects the auxiliary tank to the factory tank via the factory filler, keeping the factory tank full. When the auxiliary tank is empty, your factory fuel gauge will move off the full mark. The system has rollover protection on the tank and the factory fill neck adapter. It should be noted that some newer model trucks may encounter issues with the fuel valve being permanently left open, which can cause an improper reading of the fuel level between the factory fuel tank and the computer.
The Universal Auxiliary Gasoline Install Kit from Midway Tanks is used to install an auxiliary gasoline tank to your truck's factory gas tank. An in-line pump is required to pump from the auxiliary tank into the factory tank. The kit provides everything needed for installation on most gasoline trucks, although an in-line pump must be purchased separately.
Transfer Flow, Inc. offers an extensive network of 200 authorised installers throughout the US and Canada, all of whom have undergone thorough screening and are experienced in installing multiple fuel systems. Their facility, located 90 miles north of Sacramento in Chico, is open Monday to Friday, with installation appointments at 7 AM and 11 AM.
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Factory installation
Additionally, companies that offer factory installation often have authorized installers throughout the country. For example, Transfer Flow has a network of 200 authorized installers across the United States and Canada. These installers have been thoroughly screened and are experienced in installing multiple fuel systems from various product lines. This means that even if you cannot make it to the factory, there may be an authorized installer closer to you who can perform the installation.
For those who prefer to install the auxiliary fuel tank themselves, there are installation kits available, such as the Fuel Shotz Installation Kit from Midway Tanks. This kit can be used to install an auxiliary diesel fuel tank, and it connects to the vehicle's fuel system via the factory filler. The kit includes detailed instructions and can be installed in less than an hour, making it a quick and easy option for those who feel comfortable with the installation process.
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DIY installation
Installing an auxiliary fuel tank is a complex process that requires careful planning and execution. Here is a step-by-step guide to help you with the DIY installation of an auxiliary fuel tank, specifically for a diesel truck:
Preparation:
Firstly, ensure you have a spacious and safe working area. Remove any items from the bed of the truck, such as a bed mat. It is crucial to have an extra pair of hands to help lift and position the tank, preventing any damage to the truck's finish. Before beginning the installation, review the instructions and familiarize yourself with the process.
Installation Process:
- Positioning the Tank: Place the auxiliary diesel fuel tank in the desired location, ensuring it is away from the sides, front, and back of the bed. This spacing prevents the tank from rubbing against the truck bed and causing potential damage.
- Marking Holes: Use a brightly coloured marking tool, such as a wax pen or chalk, to visibly mark the holes where you will attach the fuel tank to the bed of the pickup. This step ensures you drill in the correct places and avoids any mistakes.
- Drilling and Mounting: Drill the marked holes and use the appropriate bolts, nuts, and washers to securely fasten the fuel tank in position. You may also need to drill additional holes for the fuel line and drain tube, depending on your vehicle's configuration.
- Fuel Line Connection: Connect the fuel line to the auxiliary tank. This may involve cutting the filler neck and positioning the Tee correctly to ensure proper functioning of the check valve. Refer to vehicle-specific instructions or forums for detailed guidance on this step.
- Grounding and Cushioning: Ensure proper grounding of the fuel tank, especially for gasoline tanks, to prevent static buildup and potential hazards. Additionally, consider using strips of rubber or foam to cushion and set the tank in place, preventing any unwanted movement.
Additional Considerations:
- If you need to lift the truck during the installation, use an appropriately rated jack and always support the vehicle with jack stands placed on flat portions of the frame.
- Some trucks allow access to the bottom side of the truck bed by removing rubber plugs, providing an alternative method for running the fuel line.
- If you're installing an inline fuel filter, remember to prime it before installation.
While this guide provides a general overview of the installation process, specific steps may vary depending on your vehicle's make and model. Always refer to manufacturer instructions and seek advice from experienced individuals or forums when tackling a DIY installation of an auxiliary fuel tank.
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Safety precautions
When it comes to installing auxiliary fuel tanks, safety is of utmost importance. Here are some detailed safety precautions to follow:
Certified Installers and Fuel Tank Systems
It is essential to engage certified professionals for installing auxiliary fuel tanks. Companies like Transfer Flow, Inc. have an extensive network of authorized installers throughout North America, ensuring proper installation that adheres to safety standards.
Fuel Tank Requirements and Markings
Fuel tanks must meet specific requirements, as outlined in the Electronic Code of Federal Regulations (e-CFR). For example, each fuel tank must have a non-spill air vent, such as a ball check valve, and be marked with the manufacturer's name, manufacture date, gallon size, and a warning not to exceed 95% of its capacity.
Safe Fuel Storage and Handling
Adhere to strict safety measures when storing and handling fuel. Use approved containers and portable fuel tanks, and avoid storing fuel near exits or passages. Only store the necessary amount of flammable liquid, and ensure the fuel tank is on a stable surface. Always seal containers tightly, and never smoke around fuel to prevent hazards associated with open flames and fuel vapors.
Spill Preparedness and Response
Have well-established protocols and regular employee training to manage fuel spills promptly. Keep spill kits readily available and set up containment systems to limit environmental harm.
Refueling and Transfer Precautions
When refueling or transferring fuel, use a spout or funnel to avoid spills, and never leave the fuel pump unattended. Stop transferring before it overflows, and never overfill mobile refueling tanks or vehicle fuel tanks.
Personal Protective Equipment (PPE)
Always wear appropriate Personal Protective Equipment (PPE) when handling fuel, including eye protection, hearing protection, hand and foot protection, and flame-resistant clothing (FRC).
Fire Safety
Keep a fire extinguisher close by when handling fuel to mitigate fire risks.
Pressure Resistance and Venting
Fuel tanks with a capacity of more than 25 gallons must have a safety venting system to prevent internal tank pressure from rupturing in the event of a fire. Additionally, the body and fittings of these tanks must be capable of withstanding internal hydrostatic pressure as specified in the e-CFR.
These safety precautions are crucial when installing and using auxiliary fuel tanks. By following these guidelines, you can help ensure the safety of yourself, others, and the environment while benefiting from the convenience of additional fuel capacity. Installation kits are also available for quick and easy setup.
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Placement and marking
Placement
The placement of an auxiliary fuel tank can depend on various factors, including the vehicle's configuration and personal preferences. Some individuals opt for mounting the tank towards the front, near the cab, while others prefer positioning it behind the wheel wells. The former option offers better weight transfer and handling characteristics, but accessibility for filling and hose management might be challenging, particularly with a camper shell and wooden sleeping platform in the way. Mounting the tank between the wheel wells is generally considered acceptable, provided you adjust your driving habits accordingly when carrying significant liquid weight.
Markings
Fuel tank identification tags and markings are of paramount importance, providing critical information about the tank and its contents. These markings are essential for workers, inspectors, and first responders, especially during emergencies. Here are the key aspects of markings:
- Fuel Type: Clearly indicating the type of fuel (e.g., diesel, regular) is essential for operational and safety purposes.
- Liquid Capacity: Both the manufacturer and the installer must ensure that the tank is plainly marked with its liquid capacity. This marking is mandated when the tank is visible after installation.
- Fill Level Warning: A prominent warning must be displayed on the tank, cautioning against filling it beyond 95% of its capacity.
- Flammability and Hazards: Markings or placards indicating flammability, chemical reactivity, health hazards, and necessary precautions are vital, especially for tanks storing flammable liquids over 100 gallons. These markings assist firefighters and first responders in taking swift and appropriate actions during emergencies.
- Certification: Each liquid fuel tank should bear a certification that it conforms to the applicable rules and regulations. This certification can vary based on the tank's manufacture date and specific characteristics.
- Inspection Information: Fuel tanks may also be marked with inspection-related details, such as the date of the last inspection, serial number, or other pertinent information to ensure the tank's safety and regulatory compliance.
- Colour Coding: Colour coding can be employed for fuel type identification and safety warnings, such as using red to indicate a fire hazard.
These markings are subject to federal, state, and local guidelines, and they play a pivotal role in ensuring the safe operation and handling of auxiliary fuel tanks.
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Frequently asked questions
Transfer Flow, Inc. has a network of 200 authorized installers throughout North America who can install their fuel tank systems.
They are located throughout the US and Canada.
To check available install dates or to schedule an installation, call (800) 442-0056.
Yes, you can install an auxiliary fuel tank yourself using an installation kit. However, it is important to ensure that the installation is done properly and safely.










































