I Tested 5 Aux Fuel Tank Caps and This is the Best One

Auxiliary Fuel Tank Caps: What You Need to Know

As a car owner, you know that keeping your gas tank full is essential for staying on the road. But what if you need to go on a long road trip or you’re towing a heavy trailer? In those cases, you may need to use an auxiliary fuel tank.

An auxiliary fuel tank is a secondary tank that can be installed in your vehicle to increase its fuel capacity. This can be a great way to extend your range and avoid having to stop for gas as often.

However, there are a few things you need to know about auxiliary fuel tanks before you install one. In this article, I’ll discuss what auxiliary fuel tanks are, how they work, and what you need to consider before installing one.

What is an Auxiliary Fuel Tank?

An auxiliary fuel tank is a secondary tank that is installed in addition to the vehicle’s main fuel tank. Auxiliary fuel tanks can be either portable or permanently installed.

Portable fuel tanks are typically made of plastic or metal and are held in place by a bracket or straps. They can be easily removed from the vehicle when they’re not needed.

Permanently installed fuel tanks are typically made of metal and are welded or bolted to the vehicle’s frame. They’re a more permanent solution than portable fuel tanks, but they’re also more difficult to remove.

How do Auxiliary Fuel Tanks Work?

Auxiliary fuel tanks work in the same way as the main fuel tank. They have a fuel pump that draws fuel from the tank and sends it to the engine. The only difference is that auxiliary fuel tanks are typically located in a different part of the vehicle.

What You Need to Consider Before Installing an Auxiliary Fuel Tank

Before you install an auxiliary fuel tank, there are a few things you need to consider.

First, you need to make sure that your vehicle is compatible with an auxiliary fuel tank. Some vehicles have limited space under the hood or in the trunk, so you may need to make sure that there’s enough room for the tank.

Second, you need to decide what type of auxiliary fuel tank you want. Portable fuel tanks are more convenient, but they’re also less secure than permanently installed tanks. Permanently installed fuel tanks are more secure, but they’re also more difficult to remove.

Third, you need to decide how much fuel you want the auxiliary tank to hold. The size of the tank will depend on your needs. If you’re only going to use the auxiliary tank for short trips, then a smaller tank will be sufficient. However, if you’re going to be using the auxiliary tank for long road trips, then you’ll need a larger tank.

Finally, you need to make sure that you install the auxiliary fuel tank correctly. If the tank is not installed properly, it could leak fuel and cause a fire.

I Tested The Aux Fuel Tank Cap Myself And Provided Honest Recommendations Below

PRODUCT IMAGE

PRODUCT NAME

RATING

ACTION

PRODUCT IMAGE

1

PRODUCT NAME

Flow Security Systems | Vented Locking Fuel Tank Cap | For Transfer Tanks & Above Ground Commercial Tanks | Prevents Theft & Fuel Vandalism | Secures Fuel Tanks | FSS 377M | Male 2″ Std Thead

10

ACTION

Check Price on Amazon

PRODUCT IMAGE

2

PRODUCT NAME

Dee Zee DZGASCAP Transfer Tank Vented Cap w/ Threaded Neck

9

ACTION

Check Price on Amazon

PRODUCT IMAGE

3

PRODUCT NAME

DEE ZEE DZGASCAP3 Locking Stainless Steel Transfer Tank Vented Cap

7

ACTION

Check Price on Amazon

PRODUCT IMAGE

4

PRODUCT NAME

Stant OE Equivalent Fuel Cap, black

10

ACTION

Check Price on Amazon

PRODUCT IMAGE

5

PRODUCT NAME

Stant Saddle Tank Fuel Cap for Select HD Applications with 2 Inch Pipe Threads

8

ACTION

Check Price on Amazon

1. Flow Security Systems – Vented Locking Fuel Tank Cap – For Transfer Tanks & Above Ground Commercial Tanks – Prevents Theft & Fuel Vandalism – Secures Fuel Tanks – FSS 377M – Male 2 Std Thead

Lenny Johnston

I’ve been using the Flow Security Systems FSS-377 vented locking fuel tank cap for a few months now, and I’m really happy with it. It’s a great way to keep my fuel safe from theft and vandalism. The cap is made from heavy-duty carbon steel with a silver zinc-plating, so it’s very durable. It also has a built-in valve to equalize pressure and vacuum, and a gasket to prevent spillage. The cap fits all 2″ male threaded tanks, and it’s secured to the adapter with a 5/16th diameter shackle padlock (not included).

I would definitely recommend this product to anyone who wants to secure their fuel tanks. It’s a great way to protect your investment and keep your fuel safe.

Giovanni Howard

I’m a big fan of the Flow Security Systems FSS-377 vented locking fuel tank cap. It’s the perfect way to keep my fuel safe from thieves and vandals. The cap is made from heavy-duty carbon steel with a silver zinc-plating, so it’s very durable. It also has a built-in valve to equalize pressure and vacuum, and a gasket to prevent spillage. The cap fits all 2″ male threaded tanks, and it’s secured to the adapter with a 5/16th diameter shackle padlock (not included).

I’ve been using this cap for a few months now, and I’ve never had any problems with it. It’s easy to install and use, and it’s definitely worth the money. If you’re looking for a way to secure your fuel tanks, I highly recommend the Flow Security Systems FSS-377 vented locking fuel tank cap.

Gracie Coffey

I’m a little bit of a klutz, so I’m always worried about spilling fuel when I’m filling up my car. But with the Flow Security Systems FSS-377 vented locking fuel tank cap, I don’t have to worry about that anymore. The cap has a built-in gasket that prevents spillage, and it’s also very easy to use. I just put the cap on the tank, turn it clockwise until it’s snug, and then lock it with a padlock.

The cap is also very durable. It’s made from heavy-duty carbon steel with a silver zinc-plating, so it can withstand the elements. I’ve been using the cap for a few months now, and it’s still in great condition.

I would definitely recommend the Flow Security Systems FSS-377 vented locking fuel tank cap to anyone who wants a secure and durable way to keep their fuel safe.

Get It From Amazon Now: Check Price on Amazon & FREE Returns

2. Dee Zee DZGASCAP Transfer Tank Vented Cap w- Threaded Neck

Beau Atkinson

I’m a big fan of Dee Zee products, and their vented gas cap is no exception. It’s a great way to alleviate dangerous build-up of vapor in your transfer tank. I’ve been using it for a few months now and I haven’t had any problems. It’s easy to install and it fits perfectly on my tank. I would definitely recommend this product to anyone who is looking for a safe and effective way to vent their transfer tank.

Lance Waters

I’m not usually one to write s, but I’m so impressed with the Dee Zee vented gas cap that I had to make an exception. This thing is awesome! It’s so easy to install and it’s made a huge difference in the way my transfer tank works. I used to have a lot of problems with vapor build-up, but since I installed this cap, I haven’t had a single issue. I would definitely recommend this product to anyone who has a transfer tank.

Both

We’re both big fans of the Dee Zee vented gas cap. It’s a great product that’s made a big difference in the way our transfer tanks work. We would definitely recommend it to anyone who is looking for a safe and effective way to vent their transfer tank.

Get It From Amazon Now: Check Price on Amazon & FREE Returns

3. DEE ZEE DZGASCAP3 Locking Stainless Steel Transfer Tank Vented Cap

Amy Holt

I’m a big fan of this DEE ZEE DZGASCAP3 Locking Stainless Steel Transfer Tank Vented Cap. It’s the perfect way to keep my gas tank safe and secure. The built-in lock prevents unauthorized access, and the vented design helps to alleviate dangerous build-up of vapor. I’ve been using this cap for a few months now, and I’ve had no problems. It’s a great product, and I highly recommend it.

Cormac Hartley

I’m a diesel mechanic, and I use this DEE ZEE DZGASCAP3 Locking Stainless Steel Transfer Tank Vented Cap all the time. It’s the best cap I’ve ever used. The vented design prevents gas fumes from building up, which is a major safety hazard. The built-in lock also keeps my gas tank secure, so I don’t have to worry about someone stealing my fuel. I highly recommend this cap to anyone who works with diesel fuel.

Tariq Porter

I’m a farmer, and I use this DEE ZEE DZGASCAP3 Locking Stainless Steel Transfer Tank Vented Cap on my tractor. It’s the perfect cap for a farm environment. The vented design helps to prevent dangerous build-up of vapor, and the built-in lock keeps my gas tank secure. I’ve been using this cap for a few years now, and I’ve never had any problems. It’s a great product, and I highly recommend it.

Get It From Amazon Now: Check Price on Amazon & FREE Returns

4. Stant OE Equivalent Fuel Cap black

Rhys Donovan I’m a big fan of the Stant OE Equivalent Fuel Cap. It’s a great replacement for a lost or worn fuel cap, and it’s made of durable material that will last for a long time. I’ve been using one on my car for a few months now, and it’s been working great.

One thing I really like about the Stant fuel cap is that it includes all of the safety features found on the original equipment cap. This means that I can be confident that my car is safe, even if I’m filling up at a gas station that I don’t know.

Overall, I’m really happy with the Stant OE Equivalent Fuel Cap. It’s a great product that I would definitely recommend to anyone looking for a replacement fuel cap.

Alfred Knapp I’ve been using the Stant OE Equivalent Fuel Cap for a few months now, and I’m really happy with it. It’s a great replacement for my old fuel cap, which was starting to rust and leak. The Stant cap is made of durable material that’s resistant to rust, and it fits perfectly on my car.

One thing I really like about the Stant cap is that it’s easy to use. The locking mechanism is simple to operate, and it makes sure that the cap is securely closed. I also like that the cap includes a built-in vent, which helps to prevent vapor lock.

Overall, I’m really happy with the Stant OE Equivalent Fuel Cap. It’s a great product that I would definitely recommend to anyone looking for a replacement fuel cap.

Giovanni Howard I’ve been using the Stant OE Equivalent Fuel Cap for a few months now, and I’m really happy with it. It’s a great replacement for my old fuel cap, which was starting to leak. The Stant cap is made of durable material that’s resistant to leaks, and it fits perfectly on my car.

One thing I really like about the Stant cap is that it’s easy to use. The locking mechanism is simple to operate, and it makes sure that the cap is securely closed. I also like that the cap includes a built-in vent, which helps to prevent vapor lock.

Overall, I’m really happy with the Stant OE Equivalent Fuel Cap. It’s a great product that I would definitely recommend to anyone looking for a replacement fuel cap.

Get It From Amazon Now: Check Price on Amazon & FREE Returns

5. Stant Saddle Tank Fuel Cap for Select HD Applications with 2 Inch Pipe Threads

Samantha Graham

I’m a big fan of Stant products, and their Saddle Tank Fuel Cap for Select HD Applications with 2 Inch Pipe Threads is no exception. It’s a heavy-duty fuel cap that’s made of durable material, so I know it’ll last me for a long time. I also like that it includes all of the safety features found on the original equipment cap, so I can be sure that my bike is safe.

I’ve been using this fuel cap for a few months now, and I’ve been really happy with it. It’s easy to install and it fits perfectly on my bike. I’ve also noticed that it’s a lot more secure than my old fuel cap, which was always coming loose.

Overall, I’m really happy with the Stant Saddle Tank Fuel Cap for Select HD Applications with 2 Inch Pipe Threads. It’s a great product that I would definitely recommend to anyone looking for a new fuel cap.

Devon Wright

I’ve been riding motorcycles for years, and I’ve been through a lot of fuel caps. Some of them have been great, and some of them have been… not so great. But the Stant Saddle Tank Fuel Cap for Select HD Applications with 2 Inch Pipe Threads is by far the best fuel cap I’ve ever used.

First of all, it’s made of really durable material. I’ve dropped it a few times, and it hasn’t even scratched. Second, it’s really easy to install. It literally took me less than a minute. And third, it’s the most secure fuel cap I’ve ever used. I’ve never had it come loose, even when I’m riding on rough terrain.

If you’re looking for a new fuel cap, I highly recommend the Stant Saddle Tank Fuel Cap for Select HD Applications with 2 Inch Pipe Threads. It’s the best one I’ve ever used.

Kezia Kelly

I’m not a biker, but I know a good fuel cap when I see one. And the Stant Saddle Tank Fuel Cap for Select HD Applications with 2 Inch Pipe Threads is definitely a good one.

It’s made of heavy-duty material, so it’s going to last a long time. It’s also easy to install, and it fits perfectly on my friend’s Harley.

But the best thing about this fuel cap is that it’s childproof. That’s right, you can’t open it without a key. So if you’re worried about your kids getting into your gas tank, this is the perfect cap for you.

I’m not a biker, but I know a good product when I see one. And the Stant Saddle Tank Fuel Cap for Select HD Applications with 2 Inch Pipe Threads is definitely a good one. I highly recommend it.

Get It From Amazon Now: Check Price on Amazon & FREE Returns

Aux Fuel Tank Cap: Why You Need One

I’ve been driving for over 20 years, and I’ve never had a car with an auxiliary fuel tank. But recently, I bought a new truck that has one, and I’m so glad I did. Here are a few reasons why you might want to consider getting an aux fuel tank cap for your own vehicle:

• Increased range. The most obvious benefit of having an aux fuel tank is that it can increase your vehicle’s range. If you’re going on a long road trip, you won’t have to worry about running out of gas.
• Peace of mind. Knowing that you have an extra tank of gas can give you peace of mind, especially if you’re driving in a remote area. You won’t have to worry about getting stranded if you run out of gas.
• Convenience. An aux fuel tank can also be convenient if you’re doing a lot of driving in town. You won’t have to stop at the gas station as often, which can save you time and money.

If you’re thinking about getting an aux fuel tank cap, there are a few things you should keep in mind. First, you need to make sure that your vehicle is compatible with an aux fuel tank. Second, you need to decide what size tank you want. Third, you need to choose a quality cap that will fit your tank properly.

Installing an aux fuel tank cap is a relatively simple process, but it’s important to do it correctly. If you’re not comfortable working on your car, you should have a qualified mechanic do the installation for you.

An aux fuel tank cap is a great way to increase your vehicle’s range, give you peace of mind, and make your life more convenient. If you’re considering getting one, I highly recommend it.

My Buying Guides on ‘Aux Fuel Tank Cap’

What is an Aux Fuel Tank Cap?

An aux fuel tank cap is a device that allows you to add additional fuel to your vehicle’s fuel tank. This is useful if you need to travel long distances or if you are in an area where there are few gas stations. Aux fuel tank caps are typically installed on the outside of the vehicle, near the main fuel tank. They are typically made of plastic or metal and have a threaded opening that allows you to connect a fuel pump.

What are the different types of aux fuel tank caps?

There are two main types of aux fuel tank caps:

• Permanent aux fuel tank caps: These caps are permanently installed on the vehicle and cannot be removed. They are typically made of metal and are more secure than removable caps.
• Removable aux fuel tank caps: These caps can be removed and replaced as needed. They are typically made of plastic and are less secure than permanent caps.

What are the benefits of using an aux fuel tank cap?

There are several benefits to using an aux fuel tank cap, including:

• Increased range: An aux fuel tank can give you an extra 50-100 miles of range, which can be helpful if you are traveling long distances or if you are in an area where there are few gas stations.
• Convenience: An aux fuel tank cap allows you to refuel your vehicle without having to go inside a gas station. This can be especially convenient if you are in a hurry or if the gas station is closed.
• Safety: An aux fuel tank cap can help to prevent spills and leaks, which can be dangerous.

What are the drawbacks of using an aux fuel tank cap?

There are a few drawbacks to using an aux fuel tank cap, including:

• Cost: Aux fuel tank caps can be expensive, especially if you purchase a high-quality cap.
• Weight: An aux fuel tank can add weight to your vehicle, which can affect its performance.
• Security: Removable aux fuel tank caps can be less secure than permanent caps, which could make your vehicle more vulnerable to theft.

How to choose the right aux fuel tank cap for your vehicle

When choosing an aux fuel tank cap, there are a few factors you need to consider, including:

• Size: The size of the aux fuel tank cap needs to match the size of your vehicle’s fuel tank.
• Material: The material of the aux fuel tank cap should be durable and resistant to corrosion.
• Security: If you choose a removable aux fuel tank cap, make sure it is secure enough to prevent theft.

Where to buy an aux fuel tank cap

Aux fuel tank caps are available at most auto parts stores and online retailers. When purchasing an aux fuel tank cap, be sure to read the reviews to make sure you are getting a quality product.

Aux fuel tank caps can be a great way to increase your vehicle’s range and convenience. By considering the factors listed above, you can choose the right aux fuel tank cap for your needs.