
Auxiliary fuel tanks are an aftermarket addition to diesel trucks, providing drivers with extra fuel capacity for extended trips and peace of mind in emergency situations. They are often installed by the owners themselves, but there are also professional installers who can fit them. This option is available at factories or through authorized installers, who can be found throughout North America. The installation process requires a few key steps to ensure it is done safely and correctly, such as marking the holes for drilling and ensuring the tank is secure and doesn't rub against the truck bed.
| Characteristics | Values |
|---|---|
| Who installs extra fuel tanks on trucks? | Truck owners or professionals at authorised installation facilities |
| Where are the tanks installed? | In the bed of the truck, away from the sides, front, and back |
| Why are extra fuel tanks installed? | To fill other diesel-powered equipment that can't go to a gas station, save money on fuel, and provide peace of mind in emergency situations |
| How are the tanks installed? | By drilling holes in the truck bed, marking the installation spots, and fastening the tank with bolts, nuts, and washers |
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What You'll Learn

Transfer Flow Inc. offers aftermarket fuel tank systems
Transfer Flow Inc. has been in the business of providing aftermarket fuel tank systems since 1983. The company offers a range of fuel tank systems designed, engineered, and manufactured in the USA, with a focus on quality and craftsmanship. Their products are safe, legal, and reliable, meeting DOT regulations for gasoline, diesel, and kerosene.
Transfer Flow's in-bed auxiliary fuel tanks are designed to provide additional fuel capacity for trucks. These tanks are made from durable aluminized steel, ensuring they are built to last and can withstand tough conditions. The tanks come in a variety of sizes, including 40-gallon, 50-gallon, 75-gallon, and even up to 100-gallon capacities. The 40-gallon refueling tank system, for example, fits under most tonneau covers and can be installed in the bed of light and heavy-duty trucks.
For those seeking to increase their truck's driving range without sacrificing bed space, Transfer Flow also offers larger replacement fuel tanks. These tanks can replace the OEM midship or aft axle fuel tank on specific cab chassis, providing a seamless integration. Additionally, Transfer Flow provides retrofit filler neck kits for various vehicle models, ensuring a smooth installation process for their customers.
The refueling tank systems offered by Transfer Flow are designed with convenience in mind. They comply with DOT regulations and come equipped with features such as a 12-volt fuel pump and a wiring harness with a cab-mounted power switch, making refueling on the go more accessible than ever. With Transfer Flow's aftermarket fuel tank systems, truck owners and manufacturers can benefit from increased fuel capacity and driving range, catering to a variety of needs and vehicle models.
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Extra fuel tanks are useful for filling other diesel-powered equipment
Additionally, extra fuel tanks can be useful in remote locations where fuel may be hard to come by. For instance, during a fuel shortage, having an extra 75 gallons of fuel can allow you to drive 1,800-2,000 miles between fuel stops, which is great for road trips or when you need to drive to work every day.
Extra fuel tanks can also help extend the range of trucks for towing. Some people plumb the extra tanks into the truck's fuel system, allowing them to tow heavier loads over longer distances.
Furthermore, extra fuel tanks can be used to fill emergency generators after major disasters. This can be a lucrative opportunity for independent contractors as it pays well and is a valuable service when fuel is needed most.
Overall, extra fuel tanks provide flexibility, peace of mind, and cost savings by ensuring a steady supply of fuel for diesel-powered equipment, vehicles, and generators, especially in remote or challenging situations.
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Extended driving capability and peace of mind in emergencies
Installing an extra fuel tank on your truck can provide extended driving capability and peace of mind in emergencies. This is especially useful for those who often drive in remote locations or go on long-distance road trips. For example, some semi-truck owners carry an extra tank in their pickup to refuel their main vehicle when out in the field or in the middle of nowhere.
Extra fuel tanks can also be used to fill other equipment that cannot be taken to a gas station, such as diesel-powered equipment used by farmers, construction workers, and contractors. This saves time and money by eliminating the need to transport large equipment to a fuel station.
Transfer Flow, Inc. manufactures aftermarket fuel tank systems and has an extensive network of over 200 authorized installers throughout the US and Canada. Their factory, located 90 miles north of Sacramento in Chico, is open for installations Monday through Friday at 7 AM and 11 AM.
If you are a DIY enthusiast, you can also install an auxiliary diesel fuel tank yourself. However, it is important to ensure that you have a spacious and safe working environment and that the installation is done properly and safely. The first step is to remove any items inside the bed of the truck, such as a bed mat, to create a clear workspace. Next, place the auxiliary fuel tank in the desired location, ensuring that it is not too close to the sides, front, or back of the bed to prevent potential damage. Then, mark the holes where you will install the tank and drill them. Finally, fasten the fuel tank in place using bolts, nuts, and washers.
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Marking holes and placement for installation
When installing an extra fuel tank in your truck, there are a few things to keep in mind to ensure the process is done properly and safely. Firstly, decide whether you want the tank to be a permanent fixture or a temporary installation, as the procedures for these two options differ. If you opt for a temporary setup, ratchet straps can be used to secure the tank using tie-down points on your truck.
For a permanent installation, marking the holes and placement is a crucial step. First, place the auxiliary diesel fuel tank in the desired location, ensuring it is away from the sides, front, and back of the bed to prevent damage from rubbing. Mark the mounting locations where the tank mounts will meet the truck bed. It is recommended to use a centre punch on the marked locations to guide the drill bit and prevent it from straying. Drill pilot holes first, then drill the final holes with a bit matching the size of your bolts. Before drilling, inspect the undercarriage of the truck bed to avoid drilling into other components, such as the existing fuel tank.
Once the holes are marked and drilled, you can bolt the new tank into place. Determine how you will run the fuel supply line from the new tank to the factory tank. Then, insert bolts with washers from the bottom of the truck bed into the new tank's inserts. Tighten the nuts with a wrench, and remember to tighten the bolts from either the bottom or top of the auxiliary truck bed.
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Authorised installers for fuel tank systems
The installation of extra fuel tanks on trucks is a service offered by some companies, such as Transfer Flow Inc., which manufactures aftermarket fuel tank systems. Transfer Flow has a network of 200 authorised installers across the US and Canada, all of whom have been thoroughly screened and have demonstrated the ability to install multiple fuel systems.
In some places, there are legal requirements that must be met when installing extra fuel tanks. For example, in Canada, the Storage Tank for Petroleum Products and Allied Petroleum Products Regulations require that storage tank systems be installed by a person approved to do so by the province or territory in which the system will be installed. If no such approval process exists, then a professional engineer must supervise the installation.
It is important to ensure that any installer is authorised and qualified to perform the installation, as there are safety considerations that must be taken into account. For example, fuel tanks should be installed in a manner that prevents abrasion, vibration, or physical damage, and that ensures they are securely fastened to the vehicle.
When choosing an installer for a fuel tank system, it is essential to consider the specific requirements and regulations that apply to your location, as well as the qualifications and experience of the installer. It is also crucial to prioritise safety and compliance with relevant standards to avoid any potential hazards associated with fuel tank installations.
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Frequently asked questions
Extra fuel tanks on trucks are typically installed by professionals at authorised factories or workshops. Transfer Flow Inc., for instance, has a factory 90 miles north of Sacramento in Chico, which is open for installations Monday through Friday. They also have a network of over 200 authorised installers across North America.
Extra fuel tanks are usually installed on trucks to fuel other equipment that cannot be taken to a gas station. This is often the case for people working in industries like landscaping, farming, construction, and contracting. An extra tank can also extend the range of the truck itself, reducing the frequency of fuel stops.
It is important to ensure that you have enough space to work and that the truck is adequately supported. All vehicles must be supported with appropriately sized jack stands placed on flat portions of the vehicle's frame. It is unsafe to get under the vehicle when it is only supported by a jack.
The first step is to ensure that there is enough space to work and that any items inside the truck bed, like a bed mat, are removed. The next step is to identify the location for the tank, ensuring that it is away from the sides, front, and back of the bed to prevent damage. Once the location is marked, holes can be drilled, and the tank can be fastened using bolts, nuts, and washers.











































