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Choosing fuel tank

Large capacity diesel fuel tanks have become essential accessories for today’s diesel pickup trucks.

This article is designed to help you figure out what type of tank your truck needs, whether you need an extra tank to increase range, a reloading tank to fill your equipment in the field, or just a factory stock fuel tank with a larger capacity.

Types of tanks

The two most popular types of large capacity diesel fuel tanks are steel or aluminum auxiliaries that are mounted in the truck bed and either feed an OEM tank or are used to transfer fuel to other vehicles or vehicles and cast plastic units. Which directly replaces the standard pickup fuel tank mounted in the rear or middle of the vessel.

But first, let’s look at the types of tanks

  • Transfer tanks are used for remote refueling. They are essential for your truck if you are using any equipment in the field, as they save you the serious inconvenience of having to trailer your equipment to the nearest fueling station.
  • Auxiliary tanks are a way to extend the range of your truck, by adding another tank that feeds into your truck’s factory tank, you can greatly increase your fuel supply.

Higher-capacity tanks replace the factory tanks of your trucks. These aftermarket tanks use unused space under the bottom of your truck to increase capacity and extend range.

Choice of tank materials

When choosing a tank, you should pay attention to the material from which it is made. The cost of the tank will be influenced by the appearance and the material. Also, one of the deciding factors will be how you are going to use the thing. Are you going to be a field operator with your backhoe running all day long? Or are you going to use it only for small jobs, such as filling up a standby generator that only runs during mains downtime? These differences in usage can lead to choosing aluminum over steel, or vice versa.

When choosing a tank, you should pay attention to the material from which it is made. The cost of the tank will be influenced by the appearance and the material. Also, one of the deciding factors will be how you are going to use the thing. Are you going to be a field operator with your backhoe running all day long? Or are you going to use it only for small jobs, such as fueling a standby generator that only runs during mains downtime? These differences in usage can lead to choosing aluminum over steel, or vice versa.

Aluminum fuel tank

always use non-rusting. Therefore, the appearance of your tank will always look flawless. There are usually two main types of aluminum tanks on the market, made from stamped sheet metal: the classic polished silver diamond pattern or the durable black powder-coated finish. But most importantly, by choosing aluminum, you won’t have to worry about rust. These tanks are great for everyday heavy-duty use, as part of any job on a construction site. And as a bonus, they also prevent fuel failure during those long breaks in refueling time.

Steel fuel tank

constructed of thicker metal than aluminum tanks. Steel up to 14 thick is often used in the walls of the tanks. Steel tanks are coated on the outside to protect against rust. On any good steel tank, you will find that a durable powder coating is usually used to make the outside of the tank more durable. Steel tanks can be black or white as standard.

Important: The powder coating will protect the outside of the tank, but the inside of a tank made of steel is not covered by anything. Therefore, the inside of the tank should have a higher fuel level at all times.

Steel is also cheaper than aluminum. Still, you have to remember that a steel tank is the best kept filled most of the time. This couldn’t be more important, you have to make sure the inside of your steel tank is always covered with fuel, so it doesn’t rust. This is not a problem if you drive your truck a lot, because driving will splash fuel around the tank and cover its insides.

Important: Some tanks available will work fine on private property or on a farm, but there are DOT regulations to consider for fuel tanks that are used for commercial operations.

Contamination is another factor that is important to look for in any fuel tank. These internal structures prevent fuel splashing during transport and are required for DOT certification.

Fuel Tank - The Best Choice

Better Built HD Transfer Tank

 4,9 Rating

Better Built HD 36 Gallon Black Steel Transfer Tank


  • 36-gallon capacity.
  • Material: black steel.
  • Automatic shutoff at the pump.
Check Best Price

The HD series is of the highest quality. 100% Fully Welded Seams. Solid one-piece body construction. Auto Lift Shocks – The “auto-lift” self-rising shock allows easy single-handed entry into the truck tool box.

HD Transfer Tank Installation – Video

Buyer’s guide for the fuel tank

This review and guide provide information on the best fuel tank to level lawn you can find.

There are quite a few manufacturers of fuel tanks on the market, and the prices vary greatly. From a pure price point of view, the type of fuel tank to the level lawn can be priced from $150 to $771.

 Fuel tank for the money

Fuel Tank review

Additional fuel tank

In today’s world quite often car owners need to install an extra fuel tank. When there is an extra fuel tank in the car, the driver feels more confident and relaxed. This is especially true for those who drive long distances. An extra fuel tank is additionally installed after the purchase of the car. In order not to bother, you can go to a car service. There, professional mechanics will install everything properly. But it is quieter to install it yourself. It is not as difficult as it seems at first glance.

First, you need to determine the volume of the future tank. And also to stock up on everything you need. Check the availability, on the frame of the car, special brackets for installing an additional fuel tank. In total there should be three of them. In case they are not present, you will have to weld them. Again, nothing complicated, but still unnecessary movement. So, there are three brackets available. Two rear and one front. Next, you need to think about which one is needed for the fuel level indicator.

There are three variants

  1. The device is combined with electronic clock. It is installed in place of a pointer clock;
  2. Fuel level indicator on the dashboard itself;
  3. Separate instrument. Installed in a convenient position, in the selected place.

Further the list of necessary tools looks like this:

  • Fuel reservoir and, of course, protection;
  • A twin neck;
  • Valve in the supply line;
  • A valve in the return line;
  • Optional switch button;
  • Necessary fasteners for valves;
  • Cistern clamp;
  • Tape fastener if required;
  • Attachment pin;
  • Pin retainer.

How to refill?

Once the tank is in place, the question quite rightly arises as to what to do with the neck. The best option is a double neck. But unfortunately this option will not suit everyone.

Another option is to put a cut-in, sports neck. There are many variants of such necks. It is necessary to consider the convenience of the refueling process. The pipe from the neck must be without sharp turns, the more straight it will be, the better. Otherwise, when filling the tank, you may face problems with splashing gasoline. If you approach this issue carefully, you won’t have any problems.

The technology of making an extra fuel tank

Fuel tanks should be made of aluminum or stainless steel. The most important thing is that the metal is dense and not rusty. Fuel with rust is not the right thing.

The most important thing is that the metal is properly treated. The gasoline and its fumes should not corrode the metal. So it is necessary to make partitions in the inner cavity of the tank with slits on the sides. This is necessary so that the fuel is less splashing in the tank; Additional fuel tanks are made for a fairly large range of vehicles. Nowadays, on many websites you can choose the necessary one, suitable for any particular make of car.

The choice is great

The range is delightful. You can choose a tank made of the required material, you can choose a tank of the desired size. Prices are quite diverse. As a rule, everything depends on the material of which the tank is made. In any case the choice is great.

How does the extra fuel tank works

The fuel can get from the additional tank into the main tank only when the engine is running at medium speed. The main task is for the fuel from the supplementary tank to get into the main tank in time.

In the process of refueling, it goes without saying that the auxiliary tank empties earlier. If you don’t want to use fuel from the additional tank, you should open the breather valve on the main tank or put a plug with it. Accordingly, the fuel from the extra tank will not be pumped. Basically, drivers have two plugs. One with a valve, the other without. Accordingly, if necessary, they change their places. In this case, fuel from the additional tank is either consumed or not. But it should be noted that if initially fuel from the main tank is consumed, then later it will be necessary to pump fuel from the additional tank. And this, in the absence of certain skills can cause difficulties.

The main advantage of the extra fuel tank

It’s simple. Going on a long journey, there is not always the certainty that on the way there will be the necessary gas station. Besides, gasoline varies from region to region. Needless to say it also differs from country to country. And not only in price, but also in quality. And it won’t be easy for your vehicle to switch from one type of gasoline to another. It is not recommended to dilute it. Carrying around cans of gasoline is not always convenient. Yes, however, and the place is taken a lot. Besides there are different capacities. Someone has 70, someone else has 100 liters. If you have an extra fuel tank in your car, you can be sure that there will be no problems with gasoline. At least a certain time. You can safely continue your journey. Knowing that there is a reserve. With a large stock of fuel are not afraid of shifts at gas stations. If you can’t fill up, you can fill up later.

Definitely the procedure of extra fuel tank connection will be hard work. But the effect will be worth your expectations, considering that you can go much longer without refueling.

If nevertheless you make a decision to install a fuel tank by yourself, you should count your efforts. In principle it is not difficult, but you should know a little bit about the structure of your car. If you are not confident in your abilities, it is better to turn to professionals. In addition, you should order the fuel tank from trusted vendors. It has to be of high quality, the best if it is produced by a well-known company. In any case, an extra fuel tank will make life easier for many drivers.

All our reviews are based exclusively on expert judgments or practical experience with most of the fuel tanks we have tested. We strive to make our guide as independent and as detailed as possible.

 Fuel tanks comparison

Scepter Marine Fuel Tank

Scepter 12 Gallon Marine Fuel Tank
  • 12-gallon portable marine fuel tank.
  • Two-way vented cap.
  • With combination sight gauge/fuel pick-up.

 4,8 Rating

Check Price

Easy to Transport

The scepter 12-gallon tall profile portable marine fuel tanks meet EPA/CARB standards and come with a combination fuel pick-up/sight gauge. It accepts standard 1/4 inch NPT fuel fittings and features the scepter’s patented two-way vented cap. This fuel tank is manufactured from UV stabilized, high-density polyethylene.


RDS MFG INC 72771 Fuel Tank
  • 60 Gallon capacity.
  • Designed for exterior areas.
  • Not intended to be used for gasoline.

 4,9 Rating

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Universal Fit

This tank offers extra fuel capacity for a truck bed, generator, or other specialty application using diesel fuel. Compatible With: Diesel, water, fertilizer, oil, bio fuel, combustible fuel, Mounting Type: Truck bed/trailer, Mounting Hardware Included: Welded on mounting tabs.

RDS MFG INC Auxiliary Fuel Tank

  • 37Gal capacity.
  • Material: Aluminum.
  • DOT Approved For Transport Of Fuel.

 4,8 Rating

Check Price

Provide auxiliary fueling

Most RDS transfer tanks also provide auxiliary fueling. Diesel fuel can “gravity feed” from the bottom of your RDS tank. An optional Diesel Install Kit contains the necessary items to economically and easily connect your RDS tank to your OEM fuel tank.

Using the fuel tank

The fuel tank can be used in two ways:

  1.  As an additional fuel tank for your diesel pickup, which will use the automatic fuel controller to pump fuel into the factory tank of your pickup while you drive.
  2. It will also pump fuel to other vehicles and equipment with optional transfer pump systems that are installed inside the toolbox, so it is safe and out of sight.

How do I install an extra fuel tank?

Usually, the reserve tank is installed near the regular gas tank. In order to implement such an idea, a considerable modification of the whole fuel assembly will be required. This is a re-equipment of the pump and installation of a double neck. The design can be of two types: parallel installation of additional fuel tanks or a system of two tanks connected in series.

To properly carry out the process will require certain skills and engineering abilities, as car service stations do not take on the remodeling of the fuel supply unit. Depending on the volume of the new tank system, you should select a suitable capacity pump and related elements.

The scheme of the serial connection

In this case, the main and additional tank are equipped with intakes and breathers. After connecting the breather of the regular tank with the intake of the additional tank fuel from it will be fed into the system. When connecting you need to observe one important condition. It consists in equipping the main tank with an individual sealed filling hole. Otherwise air will flow from the reserve tank due to an atmospheric plug.

Fuel Tanks Price:

Under $200

  • Scepter Marine Fuel Tank

Under $600

  • RDS MFG INC Auxiliary Fuel Tank

Under $800

  • RDS MFG INC Fuel Tank
  • Better Built HD Transfer Tank
Max Welder

Max Welder

Hi! I'm Max Welder ( I always wanted to work with my own hands, repair something, do things. Now I combine my knowledge with computers and my own knowledge in the field of mechanics in order to understand which tools I like the most. I hope to convey some knowledge and experience.

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