The 10 Best Auxiliary Fuel Tank, Tested And Researched

Katie Finn By, Katie Finn
Best Auxiliary Fuel Tank
Best Auxiliary Fuel Tank

The Rundown

1. Best Overall: Scepter 08668 Rectangular Marine Fuel Tank

This marine fuel tank is designed with a two-way vented cap and comes with a combination sight gauge fuel pick-up. It's tall profile helps it stand out from the rest of the tanks in your boathouse. This gallon portable marine fuel tank is EPA carb approved for use on boats, Yachts, powerboats, sailboats, personal watercrafts and more. Read Review

2. Best Bang For The Buck: RDS MFG INC 71083 Rectangular Auxiliary/Transfer Fuel Tank

These tanks are designed for ease of use and convenience. They can be easily mounted, with the bolt-on strap. They also come in a variety of sizes to fit your needs, from a 4-gallon tank for those small gas cans, to a 20-gallon tank for larger equipment. Read Review

3. Best Reliable: AM-TANK Portable Fuel Tank Diesel

AM-TANK Portable Fuel Tanks are portable, rugged and reliable. They are designed for the safe and reliable transport of diesel fuel, with integrated forklift pockets, integrated handles and recesses. A suction filter provides air intake at the bottom of the tank so you can keep out any impurities that may get inside. Read Review

4. Best Adjustable: Rectangular Auxiliary Transfer Fuel Tank

With the new Auxiliary Transfer Fuel Tank you can store a large quantity of fuel in a convenient and comfortable way. The tank has special integrated handles so it is easy to transfer and handle, and has a special system to prevent the tank from leaking. Despite the large size, this fuel tank is compact enough to be put into your luggage without problems. Read Review

5. Best Exactly: RDS MFG INC Fuel Tank Tool Combo

RDS offers a complete line of tanks in various capacities and dimensions to fit your needs. Gasoline auxiliary fueling is allowed if siphoned from the top of the tank using an electric fuel pump. Read Review

Auxiliary fuel tanks are a must-have for long-distance travelers. Many manufacturers have started providing auxiliary fuel tanks as an add-on for their vehicles. These tanks help you extend the range of your car by adding a secondary source of fuel.

Besides saving you from the stress of finding a gas station in case of an emergency, they also reduce your travel costs. Auxiliary fuel tanks come in two different types -- internal and external. While internal auxiliary fuel tanks are mounted to or inside the main gas tank, external auxiliary fuel tanks connect directly to the engine with hoses. Depending on your preference and budget, you can pick either one of them as the best auxiliary fuel tank for your vehicle. Here’s everything you need to know about the best auxiliary fuel tanks and which one is right for you.

After doing extensive study and analysis over a 15 hours, We think the best auxiliary fuel tank is Scepter 08668 Rectangular Marine Fuel Tank. You can consider RDS MFG INC 71083 Rectangular Auxiliary/Transfer Fuel Tank as an alternative if you're still undecided. Other suggestions on this list are definitely worth considering, and we've put up a useful shopping guide to help you decide!

Our Top Picks

TOP Choice #1 Scepter 08668 Rectangular Marine Fuel Tank
Our Score:
  • Two-way vented cap
  • Comes with combination sight gauge/fuel pick-up
  • Tall profile 8668
  • 12 gallon portable marine fuel tank
  • EPA/carb approved
TOP Choice #2 RDS MFG INC 71083 Rectangular Auxiliary/Transfer Fuel Tank
Our Score:
  • Gasoline auxiliary fueling is allowed, if siphoned from the top of the tank by using an electric fuel pump
  • RDS offers a full assortment of tanks in various capacities and dimensions to fit your needs
TOP Choice #3 AM-TANK Portable Fuel Tank Diesel
Our Score:
  • Tanks are equipped with: 2 inch filling plug equipped with three-effects (pressure/de-pressure/overturning) air vent device.
  • Integrated forklift pockets (to lift when full). Integrated handles (to lift when empty). Integrated recesses for securing with ratchet lashing straps during transport
  • AM-TANK 58 Portable 58-gallon tanks manufactured in high density linear roto-molded polyethylene for the safe and reliable transport and supply of Diesel.
  • Special suction net filter to stop and separate impurities
5 RDS MFG INC Fuel Tank Tool Combo
Our Score:
  • RDS offers a full assortment of tanks in various capacities and dimensions to fit your needs
  • Gasoline auxiliary fueling is allowed, if siphoned from the top of the tank by using an electric fuel pump
6 John Dow Industries JDI-AFT58 Auxiliary Fuel Tank
Our Score:
JohnDow Industries
  • Equipped with protective and lockable cover
  • 12 volt transfer pump delivers fuel at 10 gallons per minute
  • Integrated recesses are provided for securing tanks with ratchet straps during transport
  • Rugged linear polyethylene construction
  • Integrated forklift pockets for moving the tank when full
  • 60-inch low profile cross bed truck tool box made of 0.06-inch aluminum with a diamond plated black finish^Rust-resistant, electrostatically applied finish can withstand unimaginable beatings and protects against water and rust^Ideal for adding extra secure storage while not compromising your view of the road or the clean look of your vehicle^Measures 60-inches (L) “inside flatbed” by 20.5-inches (H) by 11-inches (W)^Comes with a limited lifetime warranty that protects against defects in materials and workmanship
  • Highly Robust Construction: Capacity: 58 Gallon; Flow Rate: 10 GPM. Color: Gray. Made of durable polyethylene material, this portable diesel tank is durable, capable of handling changing weather conditions, and resistant to UV radiation. These high-quality materials ensure long service life.
  • Wide Application: The diesel fuel tank is designed to transport diesel fuel wherever needed, offering users the ultimate convenience by allowing them to refuel remotely on-site. It is used in many fields, including tanker trucks, outdoor industries, construction industries, etc.
  • Automatic Dispensing Nozzle: Made of premium aluminum alloy and PVC material, this automatic fuel nozzle has a smooth surface finish and is built tough. There is no chemical reaction between the nozzle and oil, so there will be no corrosion or tarnishing. These features ensure long service life.
  • Easy to Transport: The portable diesel tank has two grooves for easy and secure movement. It's easy and secure for the staff to lift diesel tanks with convenient grooves, and the integrated forklift pockets allow for secure and stable lifting onto a vehicle.
  • 58 Gallon Diesel Tank: The portable diesel tank has a well-designed structure. Two valves are provided for pressure release, and a 13.1 ft delivery hose facilitates remote power use. The mechanical clock gauge displays the level of diesel in the tank. Additionally, a 12V pump with a 10 GPM flow rate, battery clamps, 13.1 ft electric wire, and a lockable cover is also included.
  • Country Of Origin: United States
  • Item Package Dimension:48.26 cm L X 50.8 cm W X 127.0 cm H
  • Item Package Weight:47.627 kg
  • Product Type:Auto Accessory
Product Images, Product Titles, Product Highlights from Amazon Product Advertising API

What to Look For in a best auxiliary fuel tank?

Upon looking for the perfect best auxiliary fuel tank, a lot of things should be taken into account. Each item has its own challenge of purchasing.  As a result of the formation, we're here to help, advise, and provide answers to these problems.

Please keep in mind the following points to select best auxiliary fuel tank that fit you most:

Design And Safety

Look for a can that is equipped with safety features, such as no spill spouts. These are designed to reduce the chance of an accidental spillage. Some gas cans have a trigger release button, or release control button in the spout. This controls gasoline flow and shuts off automatically once your finger is removed. Make sure the spout of your can is large or small enough to fit in with any machine that you use to fill it. To reduce spillage, make sure your can has a built in spout.


Portability is important as you will need to transport the tank around the boat. It shouldn't weigh too much or be difficult to transport. A handle on the tank makes it easier to carry.

Fuel Capacity

The amount of fuel that your motor consumes on a daily basis is another important aspect. The amount of deck space is also important. You might need a narrower fuel tank if your boat has limited space. There are many fuel tanks to choose from, and each one is different.


There are many types of portable fuel tank, and each one is made from different materials. You will need to decide between the different types. Compare their benefits and drawbacks before you make your final decision.

Size & Shape

You must consider the dimensions of your boat. To support a larger outboard motor, you will need a fuel tank that holds 15 or 20 gallons. A 3-gallon fuel container is a good option for smaller boats that don't use as much fuel.
Based on the size of your boat and its capacity, you will have to decide what shape and size will be best for your needs.


All of these tanks will cause swelling. The EPA has changed regulations to ban the use of portable gas tanks for venting. The newer, portable outboard boat fuel tanks will not vent below 5 PSI. There will be noticeable swelling. Because the fuel tank will expand, many people believe that the cap or tank is damaged. This swelling can be caused by fuel vapor buildup, so the new caps need to stay sealed at 5 PSI. These new fuel tanks are safe and secure, even in the face of swelling and pressure.


To avoid any contamination and tampering, it would also be a good idea to know how to properly store gas tanks when you are boating.
You should be aware of the tank's unique design and structure. This design conforms to the safety regulations of tanks

ABYC/NMMA Requirements

It is important that all boat fuel tanks comply with the safety standards of the marine industry because of their potential danger. This product is governed by the American Boat and Yacht Council and the National Marine Manufacturers Association.
The NMMA Type Fuel System certifications must be met in all aspects of fuel tank design, performance, and installation. It is necessary to make sure your boating experience stays safe and enjoyable.


How Often Should I Be Changing The Filters At The Pump?

Most commonly, this happens every 10 to 12 month. Of course, individual circumstances will vary depending upon how much fuel is being used. However, you may find yourself changing the filters less often than normal.

What Should You Do When Fueling An Outboard Boat With A Portable Tank?

To ensure smooth ground, always refill portable fuel containers at the dock or pavement. It can be time-consuming to fuel your boat using a portable container. Make sure you have the container that is easy to hold, balance, and carry.

What Is The Best Tank To Store Gasoline?

It is not advised to store gasoline just in one container. The best way to keep gasoline safe is in sealed containers made of aluminum, steel and high-carbon, as well as fiberglass.

Diesel fuel tanks offer the best long-term storage option. Federal Government guidelines state that semi-portable 10-50 gallon tanks will be a good choice to store gasoline in residences.

Is It Safe To Keep A Full Fuel Tank On A Boat?

Because of their safety features and construction, it is perfectly safe for outboard fuel tanks to be kept on boats. We recommend that the fuel tank be filled to at least 90%. Gas expands, and can cause damage.

Where Should I Store Gas Cans In My Home?

Gas cans should not be kept in your house. The gas cans pose a danger to your health and are a fire hazard. You can store gas in an outside shed with a leakproof cover that is suitable for storage if you are determined to keep it on hand. Although it is not ideal, it is better than keeping gas in your home. Be careful about safety. Keep it away from pets and children, and out of reach of power tools and anything that might spark a fire.

How Much Gas Can You Store At Your House?

There are safety precautions to be aware of if gasoline is needed to fuel an emergency generator, lawnmower or other purposes.

Most fire codes restrict residential gas storage to 25 gallons. You should ensure that gasoline is stored in authorized gas tanks.

The approved gas storage containers must be labeled or written with the following words: Do not store gasoline ever in containers that aren't authorized.

Below are some tips to help you keep gasoline safe at home.

The tanks should be kept at least 50ft away from ignition sources such as sparks and heat.
The tanks should be placed on the ground in a location that children can't access. Make sure it is in a garage/shed and away from sunlight.

The list of best auxiliary fuel tank will be regularly updated to be included in additional data by our editor's team. Please keep an eye around for any amendments made to our website.

Our consultants could support you with problems related to best auxiliary fuel tank and other things as well. Please do not hesitate to contact us should you need advice.

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About Katie Finn

Katie Finn
Katie Finn is a freelance writer who loves to explore the world and go camping. She's also an editor for CampfireUSA, where she enjoys writing about wildlife and camping tips. She also has a passion for reading and learning new things, which she often incorporates into her writing.

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