100 Gallon Fuel Tank and Toolbox Combo

100 Gallon Fuel Tank and Toolbox Combo

If you own a four-wheeler, a truck, tractor, boat, or any heavy fuel consumption automobile, having enough stock of fuel is always satisfying. Typically, these heavy power consuming automobiles have stock tanks that can carry a substantial amount of fuel to last hundreds of miles but having a backup plan in case of anything is amazing. That’s why you may want to have a 100-gallon fuel tank and toolbox combo. 

The 100-gallon fuel tank and toolbox combo gives you a 2-in-1 solution that addresses your fuel and storage needs simultaneously. Some critical factors to consider while shopping for a fuel tank and toolbox combo includes build material, safety, warranty, size, shape, and certification.

This article will explore more about the fuel tank and toolbox combo, combining every aspect to get you up to speed with these useful devices. We shall explore the different features of the fuel tank toolbox combos to the nitty-gritty. Additionally, we shall look into the essential factors you should consider while shopping for a 100-gallon fuel tank toolbox combo and the safety tips while using the extra fuel tank. 

Factors To Consider When Buying a 100 Gallon Fuel Tank Toolbox Combo

There are many factors to be considered when looking for a fuel tank toolbox combo. As such, finding the right fuel tank toolbox combo that fits your specific needs can be daunting. The first piece of the puzzle is fuel capacity for the fuel tank; another is storage capacity for the toolbox. 

But there’s more to that than these two. Here are the various factors you should consider when buying a fuel tank toolbox combo.

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Build Material

Fuel tank toolbox combos are normally built using two kinds of materials: aluminum and steel. Steel is more robust, thick, and more decadent, while high-grade aluminum is sturdy, lighter, and thinner. 

Aluminum vs. Steel 

By nature, aluminum is resistant to corrosion, but steel is not. Steel is susceptible to corrosion when exposed to moisture, worst when exposed to salty moisture or low Sulphur fuel. Despite the durability concerns with steel, you don’t have to worry when purchasing a steel fuel tank since manufacturers apply a powder coat on top to prevent corrosion. 

However, going for the Aluminum fuel tank toolbox combos is more advisable since the weight reduction can help save fuel consumption. The US Environmental Protection Agency (EPA) says a 10 percent reduction in truck weight can cut fuel consumption by 5 to 10 percent.

Fuel and Storage Capacity

Fuel tank toolbox combos come in various capacities. You can get a fuel tank with a capacity as low as 36 to 50, 70, 80 gallons, and past 110 gallons. But 100 gallons capacity is enough to meet your daily needs for refueling your truck, tractor, or other heavy machinery. Besides, the federal government requires those carrying more than 119 gallons of class 3 flammable liquids to have a commercial driver’s license or CDL.

Another important capacity-related thing to consider is the dimensions of the fuel tank toolbox combo. And the capacity of the storage space offered by the toolbox. 

If you have significant storage needs in your toolbox, we recommend getting nine cubic feet, or 0.254852 cubic meters, toolbox. The vital thing to note is you don’t have many options for the available toolbox storage space if you’re buying a fuel tank toolbox combo. 

Generally, you’d have to settle with whatever comes with the fuel tank toolbox combo from the manufacturer. But also, get a fuel tank toolbox combo that fits your truck’s bed. 


Fuel is flammable; that’s why the fuel tank toolbox combo you select must meet all the state and federal safety requirements. The Department of Transportation (DOT) has guidelines on safe carriage of fuels like gasoline, which fall under the class 3 flammable liquids class. As a buyer, ensure the fuel tank toolbox combo is certified by the DOT, which ensures safety. 

The fuel tank should also be baffled to prevent gas from moving while the vehicle is in motion, popularly referred to as fuel sloshing

What Makes a Fuel Tank DOT Approved?

There are various factors the DOT considers to certify refueling tanks. The DOT fuel tank regulations highlight how fuel tanks transporting flammable liquids must be designed and manufactured to ensure safety while in transit and when dislodging liquids. 

There are a variety of safety procedures considered, but the major ones include.

  • A fuel tank must have spuds for the installation of fittings. 
  • Drains should be impact resistant and should ensure complete drainage of the tank.
  • Withdrawal fittings must be placed above the average fuel level in the tank when full.
  • Fill pipes should have minimal risk of fuel spillage.
  • The fill pipe of fuel tanks with at least 25-gallon (94.64-liter) capacity should fill at a minimum rate of 20 gallons per minute (GPM) or 75.71 liters per minute.
  • Tanks must be pressure-resistant.
  • Should have a safe venting system.
  • Must have overfill restriction.
  • Joints should be sealed by arc-, gas-, seam-, or spot-welding by appropriate techniques like brazing or silver soldering.


Fuel tank toolbox combos are nice to have tools, but they don’t come cheap. And you should be concerned if such costly purchases cannot last as long as you expect them to. Warranties can help you be shielded from the unfortunate. 

Ensure the fuel tank toolbox combo you go for has a clearly outlined warranty that will cover you from paying for unnecessary repairs of the product, which may be due to a design or manufacturing fault that the manufacturer should take care of. 

Luckily, most fuel tank toolbox combos have a one-year manufacturer warranty, but some can offer two, and on rare occasions, you might find more than that. 

Toolbox Security

The primary purpose of the toolbox in the fuel tank toolbox combo is to take care of your gear’s storage needs. The toolbox is responsible for the safe storage of your equipment and should ensure maximum security against theft. At the same time, it also shields your valuable gear from adverse weather conditions that may damage the tools.  

Toolboxes build with high-grade aluminum and steel are strong enough to safeguard your gear from both intruders and bad weather conditions. Toolbox locks should also be crafted from aluminum or stainless steel.

For additional protection, the toolbox should have a micro-seal gasket to prevent moisture entry, damaging the stored gear. Resistant locks should also be added for maximum protection, although you’ll have to purchase one separately. 

Fuel Supported

100-gallon fuel tank toolboxes are a must-have if you’re an owner of a truck or any other machine that uses a substantial amount of fuel. There are different classes of fuels, and chances are your truck uses one of those under the third class of flammable liquids, which includes gasoline, diesel among others. And fuel tanks are built with this important consideration in mind. 

When shopping, look for a fuel tank that supports your desired fuel’s carriage. The most common ones being compatible with diesel, gasoline, ethanol, methanol, and kerosene. But some even allow you to carry aviation fuel. DOT-approved fuel tanks can also convey other non-flammable liquids without risks. 


Buying a fuel tank toolbox combo can set you back by a fair amount of cash. With that, it’s essential to consider all the must-have accessories that are part and parcel of their daily use. A good fuel tank toolbox combo should include all the necessary accessories required for everyday usage, like a hosepipe, pump, gas cap, and mounting hardware.

Truck Bed Size

A fuel tank toolbox combo is only useful if it can fit your truck’s bed size. This is important to avoid getting an oversize product that will not fit inside or is too small. The truck bed size issue can be complex now that manufacturers have added lots of options, and they still do, with every new truck model. 

There are different categories of truck bed size, long, short, standard, and they come in lots of different dimensions. Also, consider the style of the truck bed.

Measuring Your Truck Bed Size

Your truck bed’s size is measured by determining the bulkhead and tailhead’s internal distance using a tape measure. We recommend this Benchmark 3 Pack – 25 Foot Tape Measures from Amazon. Please keep in mind manufacturers often round off their measurements, so don’t expect to get the exact figures presented on their website. 

Check out this YouTube video for guidance on how to measure the size of your truck’s bed size:

These measurements will help you select the right fuel tank toolbox combo for your vehicle. 

Truck Bed Styles

Knowing the style of your truck bed helps in determining the size. There are four main truck bed styles; sidestep, regular, extended, and four-door crew cab. Your truck bed will certainly fall under either of these four truck bed style categories. Check the different truck bed style images available in this article showcasing the four truck bed styles for easier understanding.

Fuel Tank Shape

The shape of the fuel tank toolbox combo is equally important in your purchasing decision. Most fuel tanks are rectangular or square-shaped, but some have other weird structures like L, T, and cubes. You should certainly go for a rectangular or square-shaped fuel tank toolbox combo. 


Not all fuel tanks are created equal. Some are only meant for transportation of fuel and are appropriately called transfer tanks. In contrast, some fuel tanks can be used for both transport and refueling on the go. The latter can also be connected directly to the stock truck’s fuel tank as an auxiliary.  

Difference Between Transfer and Auxiliary Fuel Tanks

When shopping around for a tank to help you add some extra fuel capacity to your truck, you’ll often bump into these two terms: transfer and auxiliary fuel tanks. The two don’t cost the same. Auxiliary fuel tanks are more expensive because they offer additional functionality relative to transfer tanks. 

Transfer Fuel Tanks

Transfer fuel tanks are solely meant for transporting additional fuel for your truck or RV while going for a long drive. Fuel in transfer tanks have to be dispensed either using an electric 12v pump or manually to your truck’s fuel tank when the need arises. Transfer fuel tanks are commonly used to carry diesel, although some can transport other fuels. 

Also, transfer tanks may not include the required pump, and if that’s the case, we recommend Fill-Rite’s 20GPM Fuel Transfer Pump on Amazon. 

Auxiliary Fuel Tanks

Auxiliary fuel tanks are additional fuel tanks that can pump fuel into your truck’s main tank on the go. They supplement your truck’s main fuel tank that the manufacturer installed. Some auxiliary tanks can dispense fuel to your stock’s tank by gravity, while others have a 12v pump included. Most of these tanks also have a cutoff valve that gives you the power to let or restrict extra fuel from flowing into the truck’s stock tank. 

For gravity-powered auxiliary tanks, fuel flows to the main tank until the extra tank is empty. Furthermore, you won’t notice fuel reduction in your truck’s dashboard until the auxiliary tank is emptied. However, both the gravity-powered and power-driven fuel tank systems must have a return line, a must-have standard safety feature to avoid overfilling the main tank. 

Significant Benefits of Auxiliary and Transfer Fuel Tanks

Using either the auxiliary and transfer fuel tanks presents these advantages.  

  • Travel longer in a breeze without unnecessary stops. With additional fuel to supplement your main tank, you can drive for miles without worrying if the next gas station is nearby. This is specifically applicable in remote areas of the country. 
  • You can buy gas in bulk where it’s cheap. Gas prices are not standard across the country. From station to station, the cost of fuel varies. The additional capacity allows you to buy more fuel in favorable stations, so you don’t have to when going to areas with inflated gas prices. 
  • Safer than using plastic fuel containers. It’s no secret that portable fuel tanks are not cheap. But they’re definitely worth using for their safety features and will give you peace of mind than when you’re carrying extra fuel in a plastic container. 

Safety Tips for Using Refueling Tanks

Several state and federal rules govern the design, manufacture, and use of refueling tanks. You should also adhere to specific safety standards to avoid landing yourself in trouble while using a refueling tank. 

Here are different safety tips to be followed while using a refueling tank.

Don’t Weld Burn Any Component on the Fuel Tank Toolbox Combo

Class 3 liquids are highly flammable and could explode when exposed to some temperatures. These liquids have a flashpoint of less than 60.5 °C (141 °F), but some exceptions apply. At these temperatures, these liquids can burst into flames when ignited. 

Observe Proper Venting Procedures

Handle accessories like gas cap and rollover emissions valves carefully not to exert extreme pressure on the fuel tank. Although DOT-approved tanks are pressure tested, you should avoid performing your real-world experiment by putting immense pressure on these tanks. 

Use Accessories Recommended by the Manufacturer

Every manufacturer has his specific set of accessories compatible with their auxiliary fuel tanks. However, some may not include these crucial accessories out-of-the-box in their fuel tanks. 

To be safe, ensure you buy proprietary manufacturer accessories, or third-party ones recommended by them, for use in your auxiliary fuel tank. Using makeshift alternatives is risky and may put your life in danger. 

Firmly Fit the Auxiliary Fuel Tank

The fuel tank should be securely fastened in either your truck’s bed or frame to prevent detachment in case of a collision. The detachment of the fuel tank in the event of a crash can exert massive pressure, which can cause the fuel to burst into flames. 

Don’t Fill the Tank to 100 Percent Capacity

This applies even to main vehicle tanks. You should fill the container and leave some space to give the fuel room for expansion if the temperature rises. This may not be an issue with some fuel tanks because they can have certain restrictions to prevent filling the tank to 100 percent. 

Only Transport Compatible Fuels Inside the Tank

Every fuel tank toolbox combo has specific fuel types that it can transport safely. If the manufacturer has specified that the tank should only carry gasoline, don’t fill it with other flammable liquids like diesel or kerosene. This can be risky because the manufacturer included the compatibility while designing and building the fuel tank. 

Use the Tank for Its Intended Purpose

Some tanks are only certified by the DOT to be used for fuel transport. If that’s the case, don’t use it as an auxiliary tank. If the tank is only intended for fuel transport, it doesn’t meet the federal regulations code to be used as an auxiliary tank. It’s essential to adhere to these simple rules. 

Don’t Modify the Tank

Manufacturers build each fuel tank toolbox combo with a specific design and capacity. Although the high-capacity models can be costly, don’t go cheap and then try to “upgrade” the limited fuel tank through modifications. Please remember your safety is of utmost importance.

Seek Expert Advice When in Need

Consult experts for installation or any other questions about the fuel tank when needed. Dealer networks exist to help product customers get after-sales help. Talk to your dealer about the correct installation procedure, use, and operation of the fuel tank toolbox combo if you have any concerns. Do not try to do it yourself. 


Every truck owner certainly needs a 100-gallon fuel tank toolbox combo. Regardless of your truck type, size, or model, extra fuel should help you go the extra mile without unnecessary stops. When shopping for a fuel tank toolbox combo, check your needs and pick something that is safe, strong, durable, and satisfies both your fuel and storage needs. 


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