Keyed Alike Locking Fuel Cap
4.3Editor score
Durable long life materials
Independently tested emissions
Anti theft protection
In this guide
Fuel theft is a growing concern for vehicle owners everywhere. Installing a locking gas cap with keys provides a simple yet effective barrier against unauthorized access to your tank.
We analyzed ten leading models based on build quality, seal integrity, and vehicle compatibility. Our list includes budget picks, OEM replacements, and specialized caps for classic cars.
Each product entry shows key specs, pros, cons, and direct links. Prices fluctuate frequently, so please verify current offers before purchasing to ensure you get the best value.
Top 3 Picks for Best Locking Gas Cap with Keys
Locking Gas Cap W/2 Keys
4.1Editor score
Fits Toyota and Scion models
High sealing performance
Direct OEM replacement
GM Genuine Parts GT264
4.4Editor score
GM OEM specification
Tight seal design
Deters fuel theft
Top 10 Best Locking Gas Cap with Keys in 2026 Compared
This side-by-side comparison highlights key specifications and features across all ten products. Review the data to find the perfect match for your specific vehicle make and model.
ProductsSpecificationsEditor scorePrice
Editor's Choice
Locking Gas Cap W/2 Keys
Fits Toyota Scion
Part Number 10504
2 Keys Included
Chemical Resistance
4.1Editor score
Editor's Choice
Locking Gas Cap Fuel Tank with Key
Universal Compatibility
ABS Plastic Material
Strong Sealing
Protects Personal Property
3.5Editor score
Best Premium
United Pacific S1301 Triple Chrome
All Metal Design
Triple Chrome Plated
Fits 1947-71
2 Keys Included
3.9Editor score
Locking Gas Cap Fuel Tank with 2 Key
ABS Anti-Theft
Flame Retardant
Direct Replacement
Wide Application
3.1Editor score
Car Locking Gas Cap Heavy Duty
High Quality ABS
Built-in Lock
Easy Installation
Sealed Design
3.1Editor score
GM Genuine Parts GT264
GM Recommended
OEM Specification
Quarter Turn Cap
2 Keys Included
4.4Editor score
Gates 31828 Locking Fuel Tank Cap
Fuel Resistant Seals
Heavy Duty Build
1/4 In Turn
2 Keys Included
4.2Editor score
Keyed Alike Locking Fuel Cap
Durable Materials
Emission Tested
Protects From Theft
Long-Life Design
4.3Editor score
Gates 31670 Locking Fuel Tank Cap
Fuel Resistant Seals
Heavy Duty Build
Deep Cam Thread
2 Keys Included
4.0Editor score
Locking Gas Cap Fit for Jeep Dodge Chrysler
Fits Chrysler Group
Part 05278655AB
Multiple Models
Easy Replacement
4.4Editor score
1. Locking Gas Cap W/2 Keys – Best Overall Locking Gas Cap with Keys
Locking Gas Cap W/2 Keys
Part Numbers Verified
High Sealing
Gasoline Resistance
2 Keys Included
This locking gas cap stands out for its precise fit across many Toyota and Scion models. With a rating of 4.1 stars, users appreciate its reliability in preventing fuel theft.
Pros
- Wide vehicle compatibility
- Strong chemical resistance
- Direct OEM replacement
- Includes two keys
- Long service life
Cons
- Verify vehicle fit before buying
- Standard plastic construction
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Its high-performance design includes gasoline and chemical resistance. This ensures the cap maintains integrity over time while providing a tight seal to reduce vapor emissions.
Some buyers must confirm their specific model year compatibility. The cap is designed for a wide range of vehicles, but cross-checking part numbers is essential for perfect installation.
Ideal for owners seeking a direct replacement with added security, this cap delivers value and peace of mind. It protects your fuel investment with minimal maintenance needs.
Superior Chemical Resistance
The cap resists gasoline and chemicals, ensuring durability and preventing degradation from regular exposure to harsh fuels.
Perfect OEM Fit
Replacing part numbers like 10504 and 77300-47020, it offers a direct fit that maintains original equipment performance standards.
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2. Locking Gas Cap Fuel Tank with Key – Universal Security Option
Locking Gas Cap Fuel Tank with Key
Universal Fit List
ABS Plastic Body
Strong Sealing
2 Keys Included
Designed for broad compatibility, this cap works with Toyota, Chevy, Nissan, and more. While rated 3.5 stars, it offers solid protection for a wide variety of vehicles.
Pros
- Fits many brands
- Durable ABS material
- Prevents vapor emissions
- Protects personal property
- Easy installation
Cons
- Lower overall rating
- Check diesel compatibility
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Constructed from ABS plastic and rubber, it ensures strong sealing and corrosion resistance. This design helps save fuel by preventing leaks and reducing harmful vapor emissions.
Owners should verify their vehicle part number before ordering as it is not for diesel models. The wide compatibility list requires careful checking to avoid returns.
This cap is an excellent choice for those needing a generic replacement with strong anti-theft features. It provides peace of mind for vehicle owners concerned about gas theft.
Strong Sealing Performance
The ABS and rubber construction provides a tight seal that prevents fuel penetration and ensures driving safety.
Protects Personal Property
With soaring gas prices, this cap acts as a barrier against theft, protecting your personal property effectively.
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3. United Pacific S1301 Triple Chrome – Best for Classic Cars
United Pacific S1301 Triple Chrome
All Metal Construction
Triple Chrome Plated
Vented Design
Classic Vehicle Fit
For classic car enthusiasts, this United Pacific cap offers all-metal construction with triple chrome plating. Rated 3.9 stars, it brings a high shine while maintaining durability for vintage vehicles.
Pros
- All metal build
- High shine finish
- Durable chrome plating
- Includes two keys
- Classic car focus
Cons
- Vintage vehicle only
- Limited modern application
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The vented locking design fits various Chevy, Ford, and GMC models from 1947 to 1971. It is a perfect blend of function and aesthetics for restoration projects.
Note that this is strictly for older models, limiting its use for modern drivers. The all-metal build adds weight and cost compared to plastic alternatives.
Recommended for owners of classic cars seeking authentic styling with modern security, this cap is a standout choice. It adds value to vintage builds with its premium look.
All Metal Durability
Unlike plastic caps, this all-metal design ensures longevity and withstands the elements better over many years.
High Shine Finish
The triple chrome plating process gives the cap a high shine, enhancing the look of classic vehicles.
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4. Locking Gas Cap Fuel Tank with 2 Key – Anti-Theft Focus
Locking Gas Cap Fuel Tank with 2 Key
Mechanical Lock
ABS Material
Flame Retardant
Multiple Parts
This cap features a mechanical lock with a cylinder molded into the ABS body. With a 3.1 rating, it provides basic security against unauthorized access to your fuel tank.
Pros
- Anti-theft lock design
- Flame retardant properties
- Wide vehicle list
- Waterproof and dustproof
- Easy installation
Cons
- Lower rating average
- Check specific fit
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It is waterproof, dustproof, and flame-retardant, ensuring safety in various conditions. The design helps prevent fuel evaporation and leakage effectively.
The wide compatibility list is a major plus, but users must verify part numbers to ensure a proper fit. Installation requires twisting until a click is heard.
Best for owners prioritizing theft prevention on a budget, this cap offers reliable protection. Its flame-retardant features add a layer of safety not found in all competitors.
Mechanical Lock Security
The integrated lock cylinder requires a dedicated key to open, effectively preventing unauthorized opening and reducing theft risk.
Flame Retardant Safety
Resistant to high and low temperatures, this cap adds safety by being flame retardant in harsh environments.
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5. Car Locking Gas Cap Heavy Duty – Durable ABS Build
Car Locking Gas Cap Heavy Duty
High Quality ABS
Built-in Lock
Tight Sealing
OEM Replacement
Made of high-quality ABS plastic, this heavy-duty cap resists scratches and wear. Its 3.1 rating suggests solid performance for specific models like Bonneville and Miata.
Pros
- High hardness ABS
- Scratch resistant
- Tight seal design
- Two keys included
- No tools needed
Cons
- Specific vehicle fit
- Limited model range
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The cap includes a built-in professional lock system paired with a dedicated key. This ensures only authorized access, fundamentally reducing fuel theft risk.
Its tight sealing design prevents vapor leaks and blocks impurities like dust and water. This protects the fuel system from failures caused by contaminants.
Ideal for owners of specific GM and Mazda models needing OEM-style replacement, this cap delivers durability. It balances cost and function effectively for targeted users.
Scratch and Wear Resistance
High hardness ABS material ensures the cap does not scratch easily, maintaining appearance over time.
Reliable Protective Barrier
The tight sealing design blocks water and dust, preventing fuel system failures from impurities.
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6. GM Genuine Parts GT264 – Premium OEM Choice
GM Genuine Parts GT264
GM OE Specification
Tight Seal
Quarter Turn
2 Keys Included
As an OEM option, this GM Genuine Parts cap guarantees perfect fit and reliability. With a 4.4 rating, it is engineered to exceed strict quality requirements for GM vehicles.
Pros
- OEM reliability
- Strict quality standards
- Deters fuel theft
- Perfect fit
- Strong durability
Cons
- Higher price point
- GM vehicles only
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The quarter-turn design offers ease of use while maintaining a tight seal to prevent theft. It is GM-recommended, ensuring you get factory-grade quality.
While more expensive, the reliability justifies the cost for those seeking original performance. It is built to maintain the form and function of your vehicle's original component.
Best for GM owners prioritizing factory standards, this cap is the premium choice. It ensures your vehicle meets emission and safety regulations without compromise.
OEM Reliability
Manufactured to GM OE specifications, it offers the quality and durability of original equipment.
Tight Seal
The cap is engineered to provide a tight seal for your vehicle's fuel tank with added theft protection.
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7. Gates 31828 Locking Fuel Tank Cap – Rugged Design
Gates 31828 Locking Fuel Tank Cap
Fuel Resistant Rubber
Heavy Duty Build
1/4 Turn Key
Emission Control
This Gates cap uses fuel-resistant rubber seals for a strong, leak-proof seal. Rated 4.2 stars, it is designed to deter fuel theft and vandalism with rugged construction.
Pros
- Fuel resistant seals
- Rugged construction
- Vandalism protection
- 2 Keys included
- Emission tested
Cons
- Specific thread type
- Check emission rating
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The cap is built heavy-duty, ensuring it withstands harsh daily use. It opens with a simple 1/4 inch turn of the key for convenience.
Owners should verify the emission control size as it varies by model. The fuel-resistant materials ensure longevity and consistent performance.
A solid choice for those needing a proven seal with anti-theft features, this cap offers value. It combines durability with security for practical everyday use.
Fuel Resistant Seals
Seals are compounded from fuel-resistant rubber to prevent leaks and ensure a tight fit.
Rugged Construction
Heavy-duty construction ensures the cap withstands harsh conditions and maintains performance.
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8. Keyed Alike Locking Fuel Cap – Affordable Security
Keyed Alike Locking Fuel Cap
Durable Materials
Emission Tested
Protects Fuel
Long Life Design
This budget-friendly cap protects your fuel from theft and vandalism effectively. With a high 4.3 rating, it is independently tested for emission control, offering reliability.
Pros
- Independent testing
- Durable build
- Protects fuel
- Affordable
- Long-life materials
Cons
- Generic fit may vary
- Check model specifics
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Manufactured from durable, long-life materials, it ensures consistent performance over time. The simple design meets essential security needs without high cost.
Its generic fit means you must verify compatibility before purchase. However, its testing ensures it meets key safety standards.
Ideal for budget-conscious owners, this cap provides essential security without breaking the bank. It is a reliable option for those needing basic fuel protection.
Emission Control Tested
Independently tested for emission control, this cap ensures your vehicle meets safety standards.
Long-Life Durability
Manufactured from durable materials, it ensures long-term performance and reduces replacement needs.
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9. Gates 31670 Locking Fuel Tank Cap – Deep Cam Thread
Gates 31670 Locking Fuel Tank Cap
Deep Cam Thread
Fuel Resistant Seals
Heavy Duty
1/4 Turn Key
This Gates model features a deep cam thread for secure closure. Rated 4.0 stars, it is made with fuel-resistant rubber seals to ensure a tight fit.
Pros
- Fuel resistant rubber
- Rugged build
- Vandalism deterrent
- 2 Keys included
- Durable design
Cons
- Check thread size
- Generic fit
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The heavy-duty construction ensures it stands up to daily wear and tear. Its design includes a locking mechanism to deter vandalism and theft.
Verify your vehicle's thread size before buying as it differs from other models. The fuel-resistant materials ensure longevity and safety.
A practical option for those needing a sturdy, reliable cap, this product offers solid value. It balances durability and function for regular use.
Deep Cam Thread
The deep cam thread ensures a secure fit that resists loosening during driving.
Fuel Resistant Seals
Seals are compounded from fuel-resistant rubber to prevent leaks and ensure safety.
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10. Locking Gas Cap Fit for Jeep Dodge Chrysler – Chrysler Group Specific
Locking Gas Cap Fit for Jeep Dodge Chrysler
Fits Chrysler Group
Part 05278655AB
Multiple Models
Easy Fit
Tailored for Jeep, Dodge, Chrysler, and Ram vehicles, this cap offers a precise fit. With a 4.4 rating, it is a trusted replacement for part 05278655AB.
Pros
- Wide model list
- High rating
- Part number match
- Easy installation
- Strong fit
Cons
- Only fits Chrysler group
- Verify specific fit
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Its compatibility spans a wide range of models, from Wranglers to Challengers. This makes it versatile for owners within the Chrysler group.
Ensure your specific model year and trim are listed to guarantee fit. The design is easy to install and replaces OEM caps effectively.
Best for Chrysler group owners seeking a reliable and compatible security cap, this product is top-rated. It ensures your vehicle's fuel tank remains secure.
Wide Model Compatibility
Fits a broad range of Chrysler, Dodge, Jeep, and Ram models for versatile use.
Easy Fit
Replaces OEM caps directly, making installation quick and hassle-free.
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Buying Guide – How to Choose the Best Locking Gas Cap with Keys
Selecting the right cap depends on fit, material, and security needs. Review these factors to ensure you choose the best option for your vehicle.
Vehicle Compatibility
Always verify that the cap matches your vehicle's year, make, and model. Many caps are designed for specific part numbers like 10504 or 05278655AB.
Check the product list carefully to ensure it fits your specific vehicle before purchasing.
Material Quality
Look for caps made from durable ABS plastic or all-metal construction depending on your needs. Quality materials resist corrosion and wear over time.
High-quality material ensures the cap lasts longer and maintains a secure seal.
Sealing Performance
The cap must have a tight seal to prevent vapor leaks and fuel evaporation. Fuel-resistant rubber seals are crucial for safety and performance.
Ensure the cap meets emission control standards to maintain vehicle safety.
Security Features
Check if the cap includes two keys for redundancy. A mechanical lock design effectively deters fuel theft and vandalism.
Choose a lock that is robust and easy to use for daily access.
OEM vs Aftermarket
OEM parts like GM Genuine Parts offer guaranteed fit and reliability. Aftermarket options provide more affordable alternatives with varied designs.
Decide based on your budget and preference for factory specifications.
Emission Standards
Ensure the cap is independently tested for emission control. This ensures your vehicle meets all local regulations and safety standards.
Look for caps explicitly marked as emission compliant.
Installation Ease
Most caps are designed for direct replacement without tools. Twist the cap until it clicks for a secure fit.
Verify that the installation process matches your comfort level.
Price and Value
Compare prices while considering build quality and included features. Some models offer better long-term value despite higher initial costs.
Aim for a balance between cost and durability to maximize value.
How to Use and Care for Your Locking Gas Cap with Keys
To install, unscrew the old cap counterclockwise and clean the fuel tank opening thoroughly. Align the new cap and twist clockwise until it clicks securely.
Insert the key and rotate it to the locked position. Keep one key in the car and the other in a safe place at home.
Regularly inspect the seal and lock mechanism. Replace if you notice cracks or wear to maintain maximum protection and performance.
Frequently Asked Questions
Will a locking gas cap affect my vehicle's performance?
No, a locking gas cap does not affect performance if installed correctly. It seals the tank just like the original cap to maintain pressure.
How do I know which part number to buy?
Check your owner's manual or remove your old cap to see the part number. Verify this number against the product compatibility list before ordering.
Are locking gas caps legal?
Yes, they are legal as long as they meet emission control standards. Ensure the product is independently tested for compliance.
What happens if I lose the key?
Most caps come with two keys to avoid this issue. Keep one spare key in a secure location to prevent lockouts.
Can I use any locking cap on any car?
No, caps have specific thread sizes and designs. Always choose a cap compatible with your vehicle's make and model.
How often should I replace my gas cap?
Replace it if you notice cracks or a broken seal. Regular inspection every few months ensures optimal performance.
Do locking gas caps save fuel?
They help save fuel by preventing evaporation. A tight seal ensures minimal fuel loss through the cap.
Final Thoughts on Choosing the Best Locking Gas Cap with Keys
Choosing the right locking gas cap protects your vehicle from theft and ensures performance. Our top picks offer options for every budget and vehicle type.
Prioritize compatibility and seal quality when selecting a cap. OEM options provide factory fit while aftermarket choices save money.
Prices change frequently so check the current offers before purchasing. This ensures you get the best value for your specific needs.