Best Automotive Replacement Fuel Tank Caps Under $100 (2026)
We ranked options under $100 by a value score combining verified user ratings, build materials, vehicle compatibility, and relevant features such as DEF compatibility or OEM fit
Top Picks
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1
RAM Diesel Fuel Cap + DEF Cap Combo (2013-2018) Easy Grip
Combo pack with a magnetic RAM diesel fuel cap and DEF cap. Keeps dirt and water out of the fill, with a smooth, easy-to-grip DEF cap and durable aluminum construction. Customers note secure magnetic attachment and OEM-like fit
- magnetic retention on metal surfaces
- two-cap combo for fuel and DEF
- rust-resistant aluminum with color anodizing
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2
DOCA Diesel Cap for Dodge Ram 2019-2025
Diesel fuel cap designed for Dodge Ram trucks with capless fuel systems. Provides airtight, dust and water resistance for the fuel system. Customer note: strong fit and build, with mixed feedback on lockability and magnet strength
- Diesel-cap compatibility
- Airtight, dust & water protection
- Heavy-duty construction with good fit
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3
Aluminum Diesel Cap for 2019-2021 Dodge Ram 6.7L
Diesel fuel cap with precise seal to keep dust, water, and debris out. Notable for fit on 2019-2021 Ram diesel models; customer notes strong appearance and secure fit with some difficulty in removal
- precision seal keeps out dust and moisture
- specific fit for 2019-2021 Ram diesel trucks
- alk aluminum construction for durability
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4
Fuel filter housing cap for Ram/Cummins 68065612AA
CNC billet aluminum fuel filter housing cap compatible with 2011-2024 Ram 6.7L and 2010 Dodge Ram diesel engines. Notches for a secure fit and leak prevention; includes cap only. Customer insight notes sturdy build and easy installation, with some concerns about thread scratches and sealing surface durability
- all-metal billet build
- accurate fit for 2011-2024 Ram 6.7L
- leak-prevention design
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5
Cap Assy, Fuel Tank (Toyota OEM)
Fuel tank cap assembly, OEM Toyota quality and vehicle-specific fit. Customers say it snaps in place with easy installation and matches their vehicle, though some report leak concerns in the seal
- genuine OEM part
- vehicle-specific compatibility
- easy snap-in installation
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6
Honda Genuine Fuel Filler Cap 17670-T3W-A01
Genuine OEM fuel filler cap designed for exact fit and durability. Consumers note authentic Honda quality and fit, with some praise for improved gas mileage and easy installation; a few report tether attachment issues
- genuine oem part
- exact fit
- durable
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7
Aluminum DIESEL Cap for 2019-2021 Dodge Ram 6.7L
Diesel fuel cap with airtight, precision fit to protect the fuel system. Made from anodized billet aluminum for durability; fits 2019-2021 Ram diesel trucks. Customer notes it fits well and keeps dust and water out
- diesel-specific fit
- durable aluminum design
- fuel protection from elements
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8
Dodge Ram Diesel Fuel Cap (2019-2025) Aluminum Magnetic Cap
Aluminum diesel fuel cap with built-in magnet and rubber seal. Helps keep dust out and attaches to the body while refueling. Customer notes fit on GMC 1500 diesel models and quality construction
- magnetic fuel cap
- dust-sealing rubber ring
- aluminum alloy cap
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9
GM Genuine Parts locking fuel tank cap with 2 keys
Locking fuel tank cap engineered for a tight seal with a tamper-resistant lock. GM OE specification for fit and reliability; customers note solid functionality and value for money
- lockable design
- GM OE fit
- two keys included
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10
Fuel Filter Housing Cap for GM Duramax 6.6L L5P (2017-2024) billet aluminum
Replaceable billet aluminum fuel filter housing cap for GM Duramax L5P. Stronger than OEM, with drain plug; includes cap and drain plug (O-ring not included)
- Billet aluminum for durability
- Direct replacement part number 134001
- Reinforced housing to resist cracking