Best Fuel Tank Caps of 2025

Robert Reyes Avatar
Robert Reyes
Last Updated: Jan 14, 2025

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Fuel tank caps are an essential component of any vehicle's fuel system. They prevent fuel from spilling out of the tank and also keep dust and debris from entering the fuel system. These caps are designed to fit snugly onto the fuel tank opening and are typically made of durable materials such as plastic or metal. Some fuel tank caps come with additional features such as locks or built-in gauges to monitor the fuel level. They are available for various types of vehicles, including cars, trucks, and motorcycles, and come in a range of sizes and designs to suit different needs and preferences.

At a Glance: Our Top Picks

Flow Security Systems VersaLock Fuel Cap Cover #TOP 1
Flow Security Systems VersaLock Fuel Cap
ftb score rating icon 9.8
Dee Zee Transfer Tank Vented Cap w/ Threaded Neck Cover #TOP 2
Dee Zee Transfer Tank Vented Cap w/ Threaded Neck
ftb score rating icon 9.7
Heavy Duty Locking Fuel Tank Cap Cover #TOP 3
Heavy Duty Locking Fuel Tank Cap
ftb score rating icon 9.5

Top 10 Fuel Tank Caps

#TOP 1

Flow Security Systems VersaLock Fuel Cap

FSS754+Adapter
Silver zinc plating
Flow Security Systems VersaLock Fuel Cap Cover
The Flow Security Systems VersaLock | Vented Locking Fuel Tank Cap | For Transfer Tanks & Above Ground Commercial Tanks | Prevents Theft & Secures Fuel Tanks | FSS 754 | Includes Adapter

The Flow Security Systems VersaLock Fuel Cap is a patented fuel cap designed to prevent unauthorized use of fuel and oil from theft, tampering, siphoning and vandalism. The Versa Lock can be keyed differently or the same and is built with a weather-proof self-closing latch cover. It uses built-in valves to equalize the pressure and vacuum and fits standard 2-inch male thread. Its patented free-spinning technology makes it virtually impossible to remove when it's in the secure mode.

What We Like
Well made
Easy installation
Effective security
Great customer support
Quality material
What We Don't Like
Requires strength to unlock
Potential vulnerability to tools
#TOP 2

Dee Zee Transfer Tank Vented Cap w/ Threaded Neck

3.3162G
Silver
Dee Zee Transfer Tank Vented Cap w/ Threaded Neck Cover
Dee Zee DZGASCAP Transfer Tank Vented Cap w/ Threaded Neck

This Dee Zee Transfer Tank Vented Cap comes with a threaded neck and is designed to replace the original cap of your Dee Zee Transfer Tank. With its vented design, it effectively reduces the dangerous build-up of vapor. It is sold individually and is a great addition to your fuel tank caps.

What We Like
Effective fuel theft prevention
High-quality construction
Good venting system
Great price compared to competitors
What We Don't Like
Lock hole alignment slightly off
Requires proper tightening to avoid leaks
#TOP 3

Heavy Duty Locking Fuel Tank Cap

FSS 376
Silver
Male 2" Std Thead
Heavy Duty Locking Fuel Tank Cap Cover
The Flow Security Systems Non-Vented Locking Fuel Tank Cap | For Transfer Tanks & Above Ground Commercial Tanks | Prevents Theft & Fuel Vandalism | Secures Fuel Tanks | FSS 376M | Male 2" Std Thead

This locking fuel tank cap is designed for use on vented tanks and includes a heavy duty cap with a 10" retaining chain to prevent loss while filling the tank. Additionally, it prevents fuel theft to ensure that your fuel stays where it belongs.

What We Like
Effective sealing
Deterrent against fuel theft
Well-built and durable
Easy to vent
What We Don't Like
Lock tab design may be weak
#TOP 4

DICMIC Vented Diesel Tank Cap

DICMIC-Z811
Black
w/ Threaded Neck
DICMIC Vented Diesel Tank Cap Cover
DICMIC Transfer Tank Vented Cap w/Threaded Neck, Venting Pressure Tank Cap with 2 Inch Base, Diesel Fuel Tank Cap for Diesel Transfer Tank, Fuel Transfer Tank & Vented Fuel Storage Tank

The DICMIC Vented Cap is designed for diesel transfer tanks, providing a reliable solution for your fuel storage needs. Its high-quality construction ensures durability, with waterproof and corrosion-resistant materials that stand the test of time. This cap effectively vents pressure from the tank, preventing dangerous vapor buildup and potential over-expansion. Additionally, it allows air to enter the tank, avoiding vacuum formation that can lead to tank collapse when drawing fuel. Installation is straightforward, making it easy for you to secure and remove the cap as needed.

What We Like
Nice and compact
Cost-effective option
Works better than expected
Priced right
What We Don't Like
Pressure relief spring feels stiff
Lock placement requires drilling
#TOP 5

Gates Fuel Tank Cap 31748

31748
Black
Gates Fuel Tank Cap 31748 Cover
Gates 31748 OE Equivalent Fuel Tank Cap

The Gates Fuel Cap is a genuine OE equivalent designed specifically for your vehicle. Its zinc-plated and dichromate dipped finish ensures excellent resistance to corrosion, helping to prolong the life of your fuel cap. This means you can rely on it to protect your fuel system from contaminants. With the vehicle-specific fit, installation is straightforward, ensuring a secure connection that minimizes the risk of leaks. This high-quality fuel cap not only enhances performance but also provides peace of mind knowing that your fuel system is well-protected.

What We Like
Perfect fit for various vehicles
Easy installation process
Eliminated check engine light
Effective in emission testing
Long-lasting performance
What We Don't Like
Compatibility concerns initially
#TOP 6

Zeeline By Milton ZE5001 Flip Top Cap

ZE5001
Black
Zeeline By Milton ZE5001 Flip Top Cap Cover
Zeeline By Milton ZE5001 2 Inch Flip Top Vented Locking Fill Cap

The Zeeline Flip Top Cap is designed for durability with its cast iron construction and powder-coated finish, ensuring it withstands the test of time. It fits perfectly on various containers with 2” NPT threaded ports, making it versatile for different applications. You can securely store your fluids thanks to the integrated lock port, which prevents any accidental spills or leaks. Plus, the minimal setup process allows you to easily thread it into the port, tighten it, and start using it right away, saving you time and effort.

What We Like
Fast delivery
Good overall quality
No assembly required
What We Don't Like
Lacks gasket or seal
#TOP 7

Stant Saddle Tank Fuel Cap

10603
Gold
Stant Saddle Tank Fuel Cap Cover
Stant Saddle Tank Fuel Cap for Select HD Applications with 2 Inch Pipe Threads

The Stant Saddle Tank Fuel Cap is a heavy duty replacement for lost or worn fuel caps. Made of durable material, it lasts longer than other aftermarket fuel caps. What sets it apart is that it includes all the safety features found on the original equipment cap, prioritizing customer safety.

What We Like
Great value for money
Perfect fit for various vehicles
Durable metal construction
Fast shipping
What We Don't Like
Chain may not be technician-proof
Possible leaks after several months
#TOP 8

JYINCPED Vented Diesel Tank Cap

Transfer Tank cap
Gold
Vented Fuel Cap
JYINCPED Vented Diesel Tank Cap Cover
Transfer Tank Vented Fuel Diesel Tank Cap,Venting Pressure Tank Cap for 2 Inch Base,Vented Gas Cap for Fuel Transfer Tank/Auxiliary Fuel Tank/Vented Fuel Storage Tank-Only Include Vented Tank Fill Cap

The JYINCPED Diesel Cap is designed for easy and safe fuel transfer. It fits standard 2-inch NPT threaded tank bases, making it versatile for various tanks like diesel, gas, and auxiliary fuel tanks. This cap features a venting system that releases pressure and prevents dangerous vapor buildup, ensuring your tank remains safe during operation. It also includes a reliable sealing mechanism to prevent leaks, giving you peace of mind while driving. With its straightforward installation and removal process, using this cap is hassle-free, making your fuel transfer tasks more convenient.

What We Like
Great value for the price
Perfect fit for fuel transfer tank
Prevents spills effectively
Functions as expected
Dark color is preferable
#TOP 9

A ABIGAIL Fuel Tank Cap

A75107F
Black
A ABIGAIL Fuel Tank Cap Cover
Fuel Tank Cap Gas Cap Compatible with Chevy Aveo Cobalt Colorado Malibu Impala Express,GMC Canyon Envoy Savana, Pontiac Grand Prix Buick LaCrosse Lucerne,Cadillac DTS CTS STS Replaces ‎95995094

The A ABIGAIL Gas Cap is crafted from durable ABS plastic, ensuring it stands up to the test of time and delivers reliable performance. It is designed as a direct replacement for various Chevy, GMC, Buick, and Cadillac models, making it a versatile choice for your vehicle. Installation is a breeze, requiring no drilling or special tools, so you can effortlessly replace your old cap. Plus, its non-locking feature allows for smooth operation, ensuring convenient access whenever you need it. With a commitment to customer satisfaction, you can reach out for support or a refund if needed.

What We Like
Great price
Slim design
Fit well with no issues
Diagnoses without codes
What We Don't Like
Adjustment needed for anchor
Cap incompatible with filler neck
#TOP 10

JYINCPED Vented Diesel Fuel Cap

Tank Vented Cap Kit
Gold
JYINCPED Vented Diesel Fuel Cap Cover
Transfer Tank Vented Fuel Cap w/Threaded Neck,Diesel Tank Cap with 2 Inch Base,Fuel Venting Pressure Tank Cap for Diesel Transfer Tank,Fuel Transfer tank,Vented Fuel Storage Tank & Auxiliary Fuel Tank

The JYINCPED Diesel Fuel Cap is designed to enhance the safety and efficiency of your diesel tanks. It fits standard 2" NPT threaded tank bungs and helps prevent dangerous vapor buildup by venting pressure when the cap is loosened. This feature protects your tank from over-expansion. Additionally, the cap allows air to enter the tank, preventing a vacuum that could lead to collapse while drawing fuel. With a lockable design, it secures your fuel from theft and tampering, ensuring peace of mind for users. The cap also includes a spring-loaded gasket to prevent leaks, making it reliable for road use.

What We Like
High quality material
Effective rubber seal
Cost-effective compared to competitors
Easy installation
Durable cast iron base
What We Don't Like
Plastic may break
Cap could be sturdier
Buying Guide Image

Finding the Best Fuel Tank Caps to Meet Your Car's Needs

Introduction

Fuel tank caps are an often overlooked but crucial component of your vehicle. They serve to keep your fuel securely stored and prevent any potentially dangerous leaks. Choosing the right fuel tank cap can mean the difference between a smooth and efficient ride, and one that is constantly plagued by issues. In this article, we'll go over some of the key factors to consider when choosing a fuel tank cap for your vehicle.

Material

Fuel tank caps are typically made from one of two materials: plastic or metal. While plastic fuel tank caps are generally less expensive, they are also more prone to wear and tear and are less durable overall. On the other hand, metal fuel tank caps are more durable and less likely to break or fail, but they are also more expensive. Ultimately, the choice of material will depend on your personal preferences and budget.

Fit

One of the most important things to consider when choosing a fuel tank cap is whether it will fit your vehicle's fuel tank properly. Fuel tank caps come in a variety of sizes and styles, so it's important to make sure you choose one that is compatible with your vehicle. If the fuel tank cap is too small, it won't provide a secure seal and may cause fuel to leak. On the other hand, if the fuel tank cap is too large, it may not fit properly and could cause damage to your vehicle's fuel tank.

Type

Another important factor to consider when choosing a fuel tank cap is the type of fuel tank cap you need. There are two main types of fuel tank caps: vented and non-vented. Vented fuel tank caps allow air to flow in and out of the fuel tank, which is important for proper fuel evaporation and emissions control. Non-vented fuel tank caps, on the other hand, do not allow air to flow in or out of the fuel tank, which can cause fuel to expand and potentially cause damage to the fuel tank.

Brand

When it comes to fuel tank caps, brand can also be an important factor to consider. Some of the most well-known and trusted brands in the automotive industry include Stant, Gates, and ACDelco. These brands are known for producing high-quality fuel tank caps that are durable and reliable. However, there are also many other reputable brands to choose from, so be sure to do your research and choose a brand that you trust.

Price

Finally, price is another important factor to consider when choosing a fuel tank cap. Fuel tank caps can range in price from a few dollars to several hundred dollars, depending on the material, fit, type, and brand. Ultimately, the best fuel tank cap for you will be one that offers the features and performance you need at a price you can afford.

Conclusion

In conclusion, choosing the right fuel tank cap is essential for ensuring the safety and performance of your vehicle. Be sure to consider factors such as material, fit, type, brand, and price when choosing a fuel tank cap. With a little bit of research and careful consideration, you can find the perfect fuel tank cap for your vehicle.

Frequently Asked Questions (FAQs)

1. Are fuel tank caps universal?

Most fuel tank caps are universal and can fit in any car or SUV. However, there might be exceptions to this. Generally, fuel caps have a diameter of 55-57 mm or 58-60 mm, including the threads.

2. What size gas cap do I need?

To determine the correct size gas cap for your car, you can refer to your car's owner manual or contact your local auto parts store or dealership. They will have the knowledge and can provide you with the appropriate model and size gas cap for your specific vehicle.

3. Can I put any gas cap on my car?

It is not recommended to put any gas cap on your car. Using an ill-fitting gas cap can allow fuel vapors to escape and let in dirt and grime. This can potentially lead to an error in the emissions system and trigger the check engine light.

4. Can a bad gas cap reduce gas mileage?

Driving without a gas cap can result in poor fuel efficiency. Without a proper seal on the fuel filler, fuel can evaporate, causing a loss of gasoline. The smell of gas is a sign of fuel evaporation, which can ultimately lead to reduced gas mileage.

5. Does having a gas cap affect gas mileage?

Yes, the presence or absence of a gas cap can affect gas mileage. If you drive without a gas cap, fuel can evaporate from the tank without a proper seal, leading to diminished gas mileage. The gasoline smell indicates the evaporation of fuel, which can result in lower fuel efficiency.

Editor's Notes

During our fuel tank cap research, we found 24 fuel tank cap products and shortlisted 10 quality products. We collected and analyzed 10,645 customer reviews through our big data system to write the fuel tank caps list. We found that most customers choose fuel tank caps with an average price of $15.16.

The fuel tank caps are available for purchase. We have researched hundreds of brands and picked the top brands of fuel tank caps, including Flow Security Systems, DEE ZEE, DICMIC, Gates, ZEELINE BY MILTON. The seller of top 1 product has received honest feedback from 73 consumers with an average rating of 4.8.

Written by
Robert Reyes Avatar

Robert Reyes is a dedicated writer from San Francisco with a bachelor of degree in mechanics and a bachelor of degree in marketing. He focuses on making some complicated topics simple and enjoys explaining complex and technical things in an easy-to-understand way.

Fuel Tank Caps Comparison Table

#TOP1
#TOP2
#TOP3
#TOP4
#TOP5
#TOP6
#TOP7
#TOP8
#TOP9
#TOP10
Brand Flow Security Systems DEE ZEE Flow Security Systems DICMIC Gates ZEELINE BY MILTON Stant JYINCPED A ABIGAIL JYINCPED
Material Hard non-ferrous alloy Aluminum Carbon Steel, Stainless Steel Cast Iron Zinc - Metal Metal Acrylonitrile Butadiene Styrene (ABS) Iron
Color - Silver Silver Black Black - Gold Gold Black Gold
Exterior Finish - Aluminum Silver zinc plated Cast Iron Machined - Machined iron Black Cast iron
Item dimensions L x W x H 3.25 x 3.25 x 2.75 inches 6 x 4 x 4 inches 3.25 x 4 x 3 inches 7.87 x 7.48 x 3.03 inches - - 3 x 3 x 2.5 inches - - -
FTB Score
ftb score rating icon 9.8
ftb score rating icon 9.7
ftb score rating icon 9.5
ftb score rating icon 9.5
ftb score rating icon 9.4
ftb score rating icon 9.3
ftb score rating icon 9.1
ftb score rating icon 9.1
ftb score rating icon 9.1
ftb score rating icon 8.9
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