Best Locking Fuel Cap for Cars and Trucks

#1 · Best Overall

1. Gates 31778

• Material: Rubber
• Compatible with Vehicle Type: Car, Truck
• Weight: 9.07 g

Best for: Quick-key regular locking cap.

Why it ranks #1: Includes two keys, fuel-resistant rubber seals, and a two-way pressure and vacuum relief valve; Gates states it meets OEM and emissions requirements.

A lock that opens with a quarter-turn of the key is the practical distinction of the Gates 31778. It includes two keys, uses fuel-resistant rubber seals, and is described as a regular locking fuel cap with emission control.

The quarter-turn key action offers a straightforward way to unlock the cap, while the two included keys provide a spare. Fuel-resistant rubber seals support sealing at the filler, and the two-way pressure and vacuum relief valve lets the tank breathe while preventing fuel-fume escape, according to Gates. Its threaded dimensions help identify the cap type, but exact vehicle fit still matters. Gates states that the cap meets OEM specifications and federal and state emission requirements.

Skip it if you require a cap for named Ford Super Duty years; MotoRad MGC-502 lists F-250 and F-350 applications.

This works for buyers seeking a regular locking cap with quick key operation, fuel-resistant seals, and two-way relief. Its supplied dimensions are not a substitute for vehicle-specific confirmation, since no models or years are named here.

Listed on Amazon as: Gates 31778 Locking Fuel Tank Cap

#2 · GM OE Replacement

2. GM Genuine Parts GT139L

• Material: Rubber

Best for: GM original-equipment replacement.

Why it ranks #2: GM-recommended replacement with a rubber gasket designed to seal out water and dirt; it carries a stated 24-month limited parts warranty.

A rubber gasket is the key practical feature of this GM Genuine Parts cap: it supports a liquid-tight seal intended to keep fuel in and water and dirt out. The threaded cap is identified as a GM-recommended replacement for the vehicle’s original component.

The threaded design attaches at the fuel-tank filler, while the rubber gasket supports the stated liquid-tight seal. That pairing addresses both closure and protection from water and dirt entering the tank, making the cap relevant when replacing the original component. GM Genuine Parts identifies it as a vehicle-specific fit, so the listing does not establish universal compatibility. Buyers should treat the GM replacement positioning as the reason to check their particular vehicle application before installation.

Skip it if you want two keys and a quarter-turn mechanism; GM Genuine Parts GT264 includes both features.

This is a sensible choice for a GM owner replacing an original threaded cap who values the stated gasket seal. Its vehicle-specific fit makes application checking essential, since the supplied details name no model years.

Listed on Amazon as: GM Genuine Parts GT139L (25060147) Locking Fuel Tank Cap

#3 · Quarter-Turn Design

3. GM Genuine Parts GT264

• Material: Rubber
• Compatible with Vehicle Type: Vehicle
• Weight: 3.84 oz

Best for: GM quarter-turn replacement.

Why it ranks #3: GM OE quarter-turn locking cap includes two keys and is engineered for a tight seal; verify the required quarter-turn fit for your vehicle.

A quarter-turn locking mechanism is the defining convenience of this GM Genuine Parts cap, with two keys included for access. It is presented as a GM-recommended replacement manufactured to GM OE specifications for fit, form, and function.

The quarter-turn format gives this cap a distinct operating style compared with threaded designs, while its lock is intended to deter fuel theft. GM’s stated OE-specification fit, form, and function positioning makes it a replacement option for an applicable original factory component. Two keys give the owner a spare. The listing also describes a rubber gasket and a tight seal, but precise vehicle applications are not provided in the supplied details, so fitment must guide selection.

Skip it if you need a cap with named vehicle-year coverage; ZONFANT’s 10504 listing supplies extensive Toyota and Chevrolet applications.

This is for GM owners whose vehicle uses the specified quarter-turn style and who want an OE-positioned locking replacement. Confirm the application and operating style before buying, as the supplied listing does not name compatible models.

Listed on Amazon as: GM Genuine Parts GT264 (25862765) Locking Quarter Turn Fuel Tank Cap with 2 Keys

#4 · Ford Truck Fit

4. MotoRad MGC-502

• Material: Aluminum
• Compatible with Vehicle Type: Car, Truck
• Weight: 3.52 oz

Best for: Ford Super Duty fitment.

Why it ranks #4: Lists fitment for Ford Super Duty trucks and E-Series models, plus pressure and vacuum relief valves and stated state and federal emissions compliance.

Specific Ford truck and van applications make the MotoRad MGC-502 a targeted choice, including F-250 and F-350 Super Duty models from 2009 through 2021. Its locking format is intended to deter vandalism and fuel theft on listed vehicles.

The model-specific fitment names F-250 and F-350 Super Duty applications for 2009–2021, alongside E-Series and F-450 entries, giving Ford owners concrete reference points. Pressure and vacuum relief valves are intended to help prevent fuel evaporation, while the cap is stated to meet state and federal emissions requirements. OEM-quality materials and an aluminum material specification describe its construction. Check the exact vehicle application before installation because the listed range varies by model.

Skip it if you need a broad cross-make cap for Toyota, Honda, or Nissan; SEEBOO SEBO-026 lists multiple makes.

This suits owners of the specified Ford Super Duty, E-Series, or F-450 applications seeking keyed fuel access and relief-valve features. Match the exact model year carefully, since the listed fitment is vehicle-specific.

Listed on Amazon as: MotoRad MGC-502 Locking Fuel Cap – Ford F-250 Super Duty (09-21) F-350 Super Duty (09-21) E-350 Super Duty (04-10) E-350 Club Wagon (04-05) E-450 Super Duty (05-10) F-450 Super Duty (09-21)

#5 · Pre-Release Design

5. Gates 31734

• Material: Metal
• Compatible with Vehicle Type: Car, Truck

Best for: Pressure-relief protection priority.

Why it ranks #5: A pre-release locking cap supplied with two keys; its internal spring and gasket valve relieves excess pressure while designed to avoid liquid-fuel loss.

An internal spring-and-gasket valve distinguishes this Gates pre-release cap, relieving excess fuel-system pressure while allowing venting without losing liquid fuel. The listed purpose is to reduce the risk of fuel spray and vapor surge, a useful focus for buyers seeking this cap configuration.

The spring and gasket valve work together to relieve excess pressure, while the specified venting behavior is intended to avoid liquid-fuel loss. Gates also identifies this as a pre-release locking fuel cap and says the configuration is for specific late-model cars. Two included keys support locking access. The listed thread dimensions help describe the cap, but the listing’s specific-vehicle caveat means buyers should verify that this pre-release type matches their application.

Skip it if you need a regular locking cap with a specified two-way relief valve; Gates 31778 lists that configuration.

This fits buyers seeking a pre-release cap with pressure relief and keyed locking, provided their vehicle calls for this configuration. Check application details carefully; Gates describes it for specific late-model cars rather than every filler neck.

Listed on Amazon as: Gates 31734 Pre-Release Locking Fuel Tank Cap

#6

6. ZONFANT 10504

• Compatible with Vehicle Type: Cruiser

Best for: Broad listed vehicle coverage.

Why it ranks #6: Supplied with two keys and lists replacement numbers 10504, 31780, and 77300-47020, with broad but year-specific vehicle compatibility.

Two included keys and replacement references 10504, 31780, and 77300-47020 give this ZONFANT cap a clear route for owners matching those part numbers. Its listed compatibility spans multiple Toyota models and Chevrolet trucks, helping buyers identify potential applications before replacing a locking fuel cap.

The replacement-number list offers a practical cross-check against an existing cap, while the supplied vehicle list names Toyota models including Corolla, Camry, RAV4, and 4Runner across specified year ranges. Chevrolet applications are also listed in the description, including Silverado models. Two keys provide a spare for the locking mechanism. Because the application list is broad and vehicle-specific, matching the exact model and year remains important before installation; the listing itself advises confirming compatibility.

Skip it if you need a cap identified specifically for diesel trucks; LANDSIN 10591D lists truck applications and diesel-cap positioning.

This suits owners whose vehicle and existing cap match the listed applications or replacement numbers, especially Toyota and Chevrolet drivers. Check the exact year and model against the supplied fitment details before choosing it.

Listed on Amazon as: Locking Gas Cap W/2 Keys, Lock Fuel Cap, Replace#10504 77300-47020

#7

7. SEEBOO SEBO-026

• Material: Acrylonitrile Butadiene Styrene (ABS)…
• Compatible with Vehicle Type: Car
• Weight: 4.8 oz

Best for: Multi-make replacement-number shoppers.

Why it ranks #7: Covers several vehicle makes and identifies replacement numbers 10504 and 77300-47020; its ABS, plastic, and rubber construction is specified.

A wide range of listed vehicle makes and replacement references 10504 and 77300-47020 define this SEEBOO locking cap’s appeal. Its ABS plastic, plastic, and rubber construction is presented as a replacement option for owners checking compatibility across several manufacturers.

The replacement references give buyers a way to compare this cap with an existing part, and the listing names vehicles across makes including Chevy, GMC, Toyota, Honda, Nissan, Acura, and Buick. Its stated ABS plastic, plastic, and rubber materials provide the construction description, while the locking-cap format addresses access control. Because the supplied fitment spans many vehicles, the listing advises checking suitability before ordering; make and part-number overlap alone should not replace an exact application check.

Skip it if you own a listed Ford Super Duty and want its specific application named; MotoRad MGC-502 lists those Ford models and years.

This is aimed at owners comparing a broad multi-make replacement cap against references 10504 or 77300-47020. Check the exact model and year in the listing before purchase, since wide make coverage does not establish every fit.

Listed on Amazon as: Locking Gas Cap, Lock Fuel Cap Compatible With Chevy GMC Silverado Cruze Express Malibu Colorado Suburban Tahoe Equinox Terrain Sierra Savana Acadia Acura Buick Cadillac Lexus And More

#8

8. Hirificing YXG01

• Material: Acrylonitrile Butadiene Styrene (ABS)
• Compatible with Vehicle Type: Car, Truck
• Weight: 4.8 oz

Best for: Two-key sealed-cap option.

Why it ranks #8: Includes two keys and uses ABS plastic with a rubber sealing design, but its stated manufacturer warranty lasts only seven days.

Two included keys and a spiral-knob design distinguish this Hirificing locking cap, with the latter described as helping it fit more tightly. The listing also attributes strong sealing to ABS plastic and rubber construction.

The spiral-knob design is stated to support a tighter fit and strong sealing, while the ABS plastic and rubber construction is described as anti-corrosion and waterproof. The listing says the seal can prevent fuel penetration and reduce vapor emissions, giving the materials and shape a practical role beyond locking. Two keys provide a spare. Compatibility is described across several makes, but matching the exact vehicle application remains essential before installation.

Skip it if you need a stated one-year warranty for a 10591D truck cap; Dtomi Filler Cap lists one year.

This suits drivers matching its listed applications who want a two-key cap with a spiral-knob seal design. The stated seven-day warranty is a meaningful boundary, and vehicle fit should be checked before installation.

Listed on Amazon as: Locking Gas Cap Fuel Tank with Key, Gas Cap Lock Locking Fuel Cap Cover Compatible with Toyota 4Runner, Chevy Silverado 1500 2500 3500, Nissan GMC Honda Subaru Buick #10504 77300-47020

#9

9. LANDSIN 10591D

• Material: Acrylonitrile Butadiene Styrene (ABS), Rubber
• Compatible with Vehicle Type: Truck
• Weight: 0.14 kg

Best for: Diesel-truck replacement cap.

Why it ranks #9: Diesel-truck-oriented cap lists replacement number 10591D and a one-year warranty, with fitment examples across Chevrolet, Dodge, Ford, and GMC.

Diesel-truck positioning and replacement reference 10591D make the LANDSIN cap a focused option for owners of listed Chevrolet, Dodge, Ford, and GMC trucks. Its stated tight seal is intended to keep the fuel tank closed.

The 10591D reference, alongside several alternate part numbers, gives buyers a comparison point when replacing an existing cap. Listed applications include truck models such as Silverado, Ram, F-250, and Sierra, with specified examples and year ranges in the supplied details. The ABS-and-rubber construction describes the cap materials, while the stated tight seal supports closure of the tank. Because diesel fitment is vehicle-specific, confirm the exact model and year against the application list.

Skip it if you need a specifically named Ford Super Duty cap with relief-valve details; MotoRad MGC-502 lists those Ford applications and valves.

This is for truck owners seeking a 10591D-style locking cap across the listed Chevrolet, Dodge, Ford, and GMC applications. Check model-year details closely; its diesel-truck positioning is not a universal passenger-car fit.

Listed on Amazon as: 10591D Locking Fuel Gas Cap For Diesel Trucks Fuel Tank

#10

10. Dtomi 10591D

• Material: Plastic
• Compatible with Vehicle Type: Truck
• Weight: 0.15 kg

Best for: 10591D truck-cap replacement.

Why it ranks #10: A locking cap for listed Chevy, GMC, and Dodge truck applications with replacement number 10591D; the product data gives limited detail beyond fitment.

Multiple replacement references, led by 10591D, give this Dtomi locking fuel cap a clear identification route for owners of listed Chevy, GMC, and Dodge trucks. Its supplied compatibility examples include Silverado, Sierra, and Ram applications.

The group of replacement references can help compare the cap with an existing part, while the listed truck applications give Chevy, GMC, and Dodge owners concrete models to check. The specification identifies plastic construction and includes one fuel-tank filler cap. That simple package description keeps the replacement workflow straightforward, but the long application list means exact year and model matching remains important. The supplied details do not specify additional sealing or pressure-relief features, so selection should rest on fitment information.

Skip it if you prioritize a stated tight seal for a diesel truck; LANDSIN 10591D specifically describes that benefit.

This suits truck owners matching one of the listed Chevy, GMC, or Dodge applications and replacement references. Verify the precise vehicle year and model, especially across the extensive fitment list, before treating it as a direct replacement.

Listed on Amazon as: Locking Fuel Cap 10591D Fit For Chevy Silverado GMC Sierra Dodge Ram