Top 8 Best Gas Caps [2021]

The fuel filler cap, fuel tank cap, or just gas cap is a part of your vehicle that you don’t think much about despite frequent use. The problem is, a fuel filler cap does a lot more than just plug your vehicle’s filler neck when you’re done filling up. Your vehicle’s fuel filler cap is part of a complex emissions control system that helps prevent pollution, which can cause environmental damage. In particular, the tank cap seals the tank of your car or truck against escaping gas vapors.

Have you heard the click of the fuel tank cap when turning clockwise to close the fuel tank? The sound made when you click is the sound of the plug. If your car’s current fuel filler cap does not make a sound, it may be one of the earliest signs of malfunction or imminent failure. There are other signs to be aware of, including engine inspection requirements. This is usually a dangerous indicator for expensive repairs, and your car manufacturer will also use it to tell you that the old plug has run out.

Fortunately, replacing the fuel filler cap on a car is cheap. To try it out, check our recommendations to find the best tank to buy, whether you need to replace a faulty tank, or just forget the original at the gas station and leave.

  • Best
    Value

    Stant 10508 Locking Fuel Cap

    Stant 10508 Locking Fuel Cap

    4.4

    2,022 reviews

    Check price

  • Editors
    Choice

    Gates 31836 Locking Fuel Tank Cap

    Gates 31836 Locking Fuel Tank Cap

    4.3

    2,081 reviews

    Check price

  • ACDelco GT261 GM Original Equipment Fuel Tank Cap

    ACDelco GT261 GM Original Equipment Fuel Tank Cap

    4.7

    1,559 reviews

    Check price

  • MotoRad MGC-817T Tethered Fuel Cap

    MotoRad MGC-817T Tethered Fuel Cap

    4.4

    893 reviews

    Check price

  • MotoRad LOCKING FUEL CAP

    MotoRad LOCKING FUEL CAP

    4.2

    395 reviews

    Check price

Stant 10508 Locking Fuel Cap Gates 31836 Locking Fuel Tank Cap ACDelco GT261 GM Original Equipment Fuel Tank Cap MotoRad MGC-817T Tethered Fuel Cap MotoRad LOCKING FUEL CAP

Best
Value

Stant 10508 Locking Fuel Cap

Editors
Choice

Gates 31836 Locking Fuel Tank Cap

ACDelco GT261 GM Original Equipment Fuel Tank Cap
MotoRad MGC-817T Tethered Fuel Cap
MotoRad LOCKING FUEL CAP
4.4

2,022 reviews

4.3

2,081 reviews

4.7

1,559 reviews

4.4

893 reviews

4.2

395 reviews

Check price Check price Check price Check price Check price

Top 8 Best Gas Caps

Stant 10508 Locking Fuel Cap

Stant 10508 Locking Fuel Cap

Check the current price

  • PROS

    • A quality locking mechanism deters fuel theft and vandalism

    • Original equipment performance and safety standards

    • OEM quality construction and materials

  • CONS

    • Does not include a tether

4.4

2,022 reviews

Check price

This is a brand whose name will definitely appear when you browse the list of the best lockable gas caps. This Stant fuel cap has perfected and professionalized the design and manufacture of closure caps, so you can get so many expectations from this product.

If your vehicle is hit, the fuel tank may collapse. This situation is very dangerous because the steam in the tank will change its pressure due to a sudden impact. In the worst case, this can cause an explosion. Let yourself be on fire.

You will be glad to know that this lockable fuel tank cap has a built-in OE pressure relief device to solve this problem. This ensures that the extra pressure is released through the plug before a natural disaster occurs.

Thanks to the OE vacuum release device, the steam control from the 10508 is top-notch. This function ensures that no gas vapor will escape from the pipe during normal use. If steam is trapped, this also allows air to enter the water tank. They did their best to ensure that they were as safe as possible in the event of an accident.

The “lost motion” function was developed to maintain the tightness of the curve. In addition, even if the lid is broken, Breakaway Groove can still ensure that the lid remains closed in the event of an accident.

Gates 31836 Locking Fuel Tank Cap

Gates 31836 Locking Fuel Tank Cap

Check the current price

  • PROS

    • Optimum fit

    • Water-resistant

    • Wear & tear resistant

  • CONS

    • Key locking has no marking. You have to get used to it.

4.3

2,081 reviews

Check price

This is another brand that you’ll see a lot on our list as they do a phenomenal job at making fuel tank caps. Despite many notable features, a fuel cap is not worth it if it doesn’t fit. The material and construction of this gas cap are top-notch so you can get the perfect fit you’ve come to expect without fuss.

One area in which the manufacturer could have improved is the locking system itself. Don’t panic – it’s perfectly functional, but still a bit impractical. The user has to look for the correct way to unlock it. When inserting the key, there is no mark to indicate this. And if the user inserts the key correctly, he has to make sure that it is really blocked. It’s not just about turning the key to the right and it’s locked. However, I have found that you get used to the mechanism and after a while, it is no longer a problem.

Such small mistakes can make or break a product. If you are looking for a product in the market that has a long lifespan, this is it. It’s reliable, environmentally friendly, wear-resistant, and fits perfectly. The best part? It looks and feels top-notch too. What more do you want?

ACDelco GT261 GM Original Equipment Fuel Tank Cap

ACDelco GT261 GM Original Equipment Fuel Tank Cap

Check the current price

  • PROS

    • A better fit for GM cars than some other aftermarket plastic gas caps

    • Buyers report excellent build quality

  • CONS

    • More expensive than other replacement gas cap

4.7

1,559 reviews

Check price

General Motors has extensive reach in the automotive industry and owns and operates a large number of sub-brands. Despite the diversity in GM’s vehicle portfolio, there are many similarities between the vehicles, which are very different on the surface. How to get a replacement gas cap for over 700 different GM vehicles (if you count different model years) built between the late 1990s and mid-2000s.

ACDelco specializes in General Motors vehicle parts, which means they know how your car works almost as well as GM. This is an OEM gas cap made especially for GM vehicles. The ACDelco GT261 is a standard threaded plastic fuel filler cap located under the gas door of your vehicle. Seal to seal the fuel filler neck against water and dust and a check valve to control the air pressure in the gas tank and to limit the fuel flow.

MotoRad MGC-817T Tethered Fuel Cap

MotoRad MGC-817T Tethered Fuel Cap

Check the current price

  • PROS

    • Includes a tether

    • Fits many vehicles

    • Less expensive than most OEM gas cap and aftermarket parts

  • CONS

    • Several Japanese car owners say the gas cap doesn’t properly seal

4.4

893 reviews

Check price

One of the disappointing parts of driving an aging European car may be the problem of finding replacement parts. If you often encounter this situation, you can use this MotoRad gas cap. The company said that this protective cover is intended to replace cars produced by almost all manufacturers in North America today and some brands that have long since disappeared from the African continent. Automakers that have now discontinued production include Daewoo, Daihatsu, Lancia, Renault, and Suzuki.

Moreover, if you are driving an old Volvo 240 or Volkswagen Fox that is rarely seen these days, this fuel tank cap should solve your emissions control problems. The non-lockable fuel tank cap contains a belt. This is a rare benefit of replacing parts, so you don’t have to remove them from the old cylinder cap. MotoRad recommends that if you find a defect when you buy it, the company will replace the protective cover for free or refund it.

MotoRad LOCKING FUEL CAP

MotoRad LOCKING FUEL CAP

Check the current price

  • PROS

    • Protects your fuel from theft and vandalism

    • Passes all state and federal emissions tests

    • Manufactured from durable, long-life materials

  • CONS

    • Not tethered and could be challenging to lock/unlock at first

4.2

395 reviews

Check price

This is another excellent MotoRad product. If you are looking for a ventilated, loose fuel tank cap, this is your best choice. When I tested it, I found that it didn’t have any real flaws. It will do its best. The locking mechanism works and does not get stuck like some models I have tried before.

The cover is manufactured in accordance with OEM quality standards and original equipment safety standards. This means you can rest assured that it will not break under any circumstances unless you intend to destroy it, which also means that it keeps the fuel safely inside, so you don’t need to deal with the leak.

Sometimes the product description says that it is suitable for a certain type of vehicle, but when you ask about it, it is not. That must be very disappointing. However, with this MGC804 high-security lockable air cap, you can be confident that it is a perfect fit. Many users swear. In the early days of use, it was a bit difficult to know how to lock and unlock it. However, once you get the hang of it, you will be satisfied with the purchase.

Gates 31844 Locking Fuel Tank Cap

Gates 31844 Locking Fuel Tank Cap

Check the current price

  • PROS

    • Two-way action pressure relief/vacuum relief valve

    • Seals are compounded from fuel-resistant rubber

    • Locking Mechanism Deters Fuel Theft & Vandalism

  • CONS

    • More expensive compared to other replacement gas caps

4.3

1,640 reviews

Check price

If preventing fuel theft is your top priority, consider replacing another fuel cap. Gates 31844 is a lockable fuel filler cap, suitable for gasoline and diesel vehicles, and can be locked and unlocked with a quarter key. Two keys are included, so you can use one as a spare key or connect it to another driver’s keyring. Gates said this 31844 air cap has a two-way valve that helps release the pressure and vacuum in the fuel tank to avoid engine performance problems.

In diesel and exhaust gas, in order to avoid pollution of oil fumes, when you buy the diesel version with this cover, it will be green, while the gasoline version is black. Gates said that for all types of vehicles, the fuel gap is reasonable. It is mainly designed for heavy-duty Ford and General Motors pickups and vans, but it is also suitable for some models of Toyota Camry pickups and trucks, and Volvo 200 and 700 series vehicles.

Allmotorparts gas cap

Allmotorparts gas cap

Check the current price

  • PROS

    • Tethered

    • Cheap alternative for BMW OEM gas caps

    • Made of high-quality engineering materials

  • CONS

    • Limited only to BMW cars

4.6

624 reviews

Check price

Replacing the fuel tank cap: Most fuel tank caps snap into place by twisting. An old, loose, cracked, or damaged fuel filler cap may cause the CEL inspection engine light to turn on. If you smell gasoline or diesel around or near the fuel filler cap, and the vehicle is not emitting smoke or making unusual noises, please take a moment to inspect the fuel filler cap.

Allmotorparts replacement gas caps are made of high-quality material that would not easily break even with maximum force during twisting. Please check your car model compatibility before buying.

Powerworks gas caps fuel tank caps

Powerworks gas caps fuel tank caps

Check the current price

  • PROS

    • Highly affordable

    • Tethered

    • Easy to use and made of high-quality material

  • CONS

    • May not fit with older Japanese car models

4.1

29 reviews

Check price

A defective fuel cap will cause the CEL inspection engine light to illuminate. Check and replace the fuel tank cap within minutes.

High-quality professional parts (non-original) that meet or exceed OEM standards. This product provides an airtight seal that keeps the vehicle’s fuel tank closed, thereby saving fuel and reducing vapor emissions. Direct exchange can save time and money than visiting your local car dealer. Last but not the least, Powerworks is one of the best locking gas caps.

Buying Guide

Now that you have reviewed some of the best leak-proof fuel tank caps, let’s take a look at the buying guide. Before deciding to buy a model, there are several aspects to consider. They are explained in this section.

  • Locking Mechanism
  • You need a lockable fuel tank cap for the locking mechanism, right? You need to check the product reviews to see if the locking system is working smoothly and as far as possible. Shortcut keys can be a potential inconvenience. Finally, you will. Periodically lock and unlock this lid to make it easier, and the easier it is to use, the better.

    Auto-lock

    Some fuel tank caps may automatically close when opened, some do not. If this is the required function, make sure that the cover of the relevant model is automatically locked.

  • Double use
  • The MotoRad lids in this list can be used as lockable or non-lockable lids, which is very useful for people who want to lock the fuel tank in a specific location or at a specific time (but not always).

    Keyed-alike

    If you have multiple car owners, it is better to have the same replacement gas caps for all of your vehicles as carrying a single key is easier. Some brands such as Stant provide this service.

  • Build quality
  • Try to obtain bottle caps that meet or exceed OEM manufacturing standards. You don’t need a fragile, easy-to-remove fuel tank cap. Inferior fuel tank caps make sealing caps meaningless. A sealed tank lid with a high degree of protection requires high quality and construction materials.

    Protecting the environment

    Air pollution prevention canister? Very neat, right? Since gasoline particles are destroying the environment, we all need to know how to reduce or even prevent our negative impact on nature. You can also become a responsible citizen and have a certified gas upper limit that can protect the environment.

  • Style
  • Although almost all air caps are standard black, there are several colors to choose from on the market. Many jeeps do not have fuel caps. Therefore, it would be great to get a fuel filler cap to match or complement the appearance of your vehicle.

  • Price
  • It is much better to invest in a good fuel tank cap than to buy the cheapest option. If you choose a slightly more expensive and better quality fuel cap, the fuel limit will be paid off in a few months.

    A good sealing device can save up to 30 gallons of fuel a year. In addition, cheaper fuel tank caps will not last long, so you may need to replace them from time to time. This may mean that you will end up spending more money on cheap gas allowances instead of just getting quality goods at higher prices.

    In addition, there are no cheap fuel filler caps and additional safety devices in the locking mechanism. It is not very effective in preventing vandalism or fuel theft. Therefore, don’t be afraid to spend a few more dollars. Trust me, it’s worth it.

    Frequently Asked Questions

    Why must the fuel tank cap be replaced?

    If the existing fuel filler cap is cracked, lost, bent, the seal is worn, or fails the emission test, it should be replaced. The United States has a mandatory annual issue. If you encounter vandalism or theft related to the gas tank, you need to close the lid.

    Are there any ventilation holes in the modern gas caps?

    Since the 1960s, the fuel tank cap has not been fully ventilated. Modern fuel tank caps are usually equipped with valves.

    Why is the fuel tank cap partially vented?

    If your vehicle’s fuel pump is mechanical, the suction on the fuel tank will prevent the fuel from flowing without vents. Cars with electric pumps can use any of them.

    Can I get multiple lockable fuel caps that can be opened with the same key?

    As mentioned above, some manufacturers also provide lockable fuel tank caps. Please contact the manufacturer you want to buy to see if they offer such a product or service.

    Will the gas caps close automatically when they reattached?

    It depends on the model, but usually, it is not. Every time you open the cover, you must manually lock and unlock it.

    What if I need another key for the lockable fuel filler cap?

    Many manufacturers offer the option of ordering other keys. Please contact customer service of the product you purchased to see if these are available.

    How can you tell when you need to replace your gas cap?

    In modern cars, the fuel tank cap is part of the greenhouse gas emission control system. The replacement gas cap can protect the vehicle’s fuel system so that gasoline or diesel fumes will not escape into the environment and cause climate change.

    If the fuel tank cap fails, you can smell fuel near the vehicle. Even if the lid is put on, it cannot be broken. Among other things when the exhaust gas cleaning system fails. Some vehicles may have a special warning light to remind you that the replacement fuel cap has failed or was not fully tightened the last time you refueled.

    If you suspect a problem with the fuel tank cap, you can check it at many repair shops that conduct car pollution tests. You removed the fuel tank cap from the car and inserted it into a device to check that the fuel tank cap is properly sealed. If this test fails, the cover needs to be replaced. However, as you can see from the list of the best replacement gas caps, this is the cheaper part.

    Should I buy a sealed petrol cap?

    If you are concerned about fuel theft, the obvious answer is yes. But please note that the fuel filler cap of the car is hidden behind the fuel filler cap, which can only be opened in the car. You may not need an upper limit. If you are driving a new model, you can lock and unlock the fuel filler cap together with the door and luggage compartment.

    This fuel filler does not prevent fuel from being stolen, but it can prevent thieves from finding an easy way to extract gasoline from parked cars. However, if the thief opens the fuel door and only finds that the fuel filler door is closed, they are more likely to give up and continue driving to another vehicle.

    Why are some fuel tank caps green or yellow?

    On most vehicles, the replacement gas cap is black, indicating that it can run on gasoline with less than 10% ethanol. If your vehicle has a green fuel filler cap, it means that it uses diesel as fuel. If your car or truck requires gasoline with an ethanol content of 15% to 85%, you will find a yellow lid under the fuel filler cap.

    Final Words

    Finally, we have reached the end of this article. With so many options, choosing the best airtight filler replacement gas caps for you can be difficult. I strongly recommend that you read the buying guide first, and then determine which factors are important to you. Then find your ideal choice. Happy shopping!

    About the author

    Andrew Clark