Best Automotive Replacement Fuel Tank Caps Under $50 (2026)
Selections were ranked by a value score that weighted vehicle fit, material quality, functional features (locking/venting/magnetic), and price under $50
The Verdict
- Best Overall: RAM Diesel Fuel Cap + DEF Cap Combo (2013-2018) Easy Grip — Best for RAM diesel owners needing a combined fuel and DEF solution with easy-grip and magnetic retention
- Best Value: DOCA Diesel Cap for Dodge Ram 2019-2025 — Best for 2019–2025 Dodge Ram users who need a direct-fit diesel replacement compatible with capless systems
This roundup covers practical replacement fuel tank caps for cars, trucks, and diesel rigs priced under $50, focusing on fit, material, and locking or venting features. Picks were chosen by value score using vehicle compatibility, build material, and functional features such as locking, venting, or magnetic retention
Top Picks
-
1
Best Overall RAM Diesel Fuel Cap + DEF Cap Combo (2013-2018) Easy Grip
Best for RAM diesel owners needing a combined fuel and DEF solution with easy-grip and magnetic retention
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
-
2
Best Value DOCA Diesel Cap for Dodge Ram 2019-2025
Best for 2019–2025 Dodge Ram users who need a direct-fit diesel replacement compatible with capless systems
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
-
3
Aluminum Diesel Cap for 2019-2021 Dodge Ram 6.7L
Best for those who want a durable aluminum diesel filler cap tailored to 2019–2021 Ram 6.7L engines
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
-
4
Fuel filter housing cap for Ram/Cummins 68065612AA
Best for replacing the fuel filter housing cap on Ram/Cummins 68065612AA-style diesel setups during maintenance
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
-
5
Cap Assy, Fuel Tank (Toyota OEM)
Best for Toyota owners seeking an OEM-style fuel tank cap that matches factory fit and sealing characteristics
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
-
6
Honda Genuine Fuel Filler Cap 17670-T3W-A01
Best for Honda vehicles requiring a genuine OEM filler cap for proper fit and original equipment sealing
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
-
7
Aluminum DIESEL Cap for 2019-2021 Dodge Ram 6.7L
Best for Ram 6.7L owners who prefer an aluminum diesel cap option built for that 2019–2021 platform
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
-
8
Dodge Ram Diesel Fuel Cap (2019-2025) Aluminum Magnetic Cap
Best for Dodge Ram 2019–2025 users wanting an aluminum cap with magnetic feature for easier handling
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
-
9
GM Genuine Parts locking fuel tank cap with 2 keys
Best for GM owners who need a locking fuel tank cap that provides keyed security with two keys included
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
-
10
VersaLock Vented Locking Fuel Tank Cap for transfer & above ground tanks
Best for transfer or above-ground fuel tanks that require a vented, locking cap designed for mobile fueling use
The VersaLock vented locking fuel cap secures transfer and above ground fuel tanks with a weatherproof, self-closing latch. Customers note straightforward installation and solid functionality, with mixed feedback on lock reliability
- tilt-free locking design
- weatherproof latch
- universal for mobile and above-ground tanks