Fuel Tank Caps of 2025
Best Choice1
Flow Security SystemsThe Flow Security Systems Vented Locking Fuel Tank Cap | For Transfer Tanks & Above Ground Commercial Tanks | Prevents Theft & Fuel Vandalism | Secures Fuel Tanks | FSS 377M | Male 2" Std Thead
Main highlights- SEALED SYSTEM: Inside gasket provides sealing and prevents spillage of the tank contents. May be susceptible to some spillage during the very brief venting time period.
- PREVENT UNAUTHORIZED USE: The Flow Security Systems FSS-377 vented fuel cap is a quick and inexpensive way to safeguard costly fuel and oil from theft, tampering, siphoning and vandalism. The FSS-377 is perfect for anyone who want to secure their fuel tanks.
- MULTIPLE USES: The FSS-377 is designed for use on mobile fuel transfer tanks, as well as above ground commercial tanks.
- DURABLE: This heavy duty cap is made from high quality, CNC machined carbon steel with silver zinc-plating for corrosion resistance and durability.
- COMPATIBILITY: Fits all 2'' male threaded tanks. Cap is secured to adapter with any 5/16th diameter shackle padlock (not included).
- BUILT-IN VALVE: The FSS-377 uses a built-in valve to equalize pressure and vacuum. The valve allows the tank to vent when pressure reaches 1.5 psi and releases vacuum at 1.5 oz
9.8Exceptional
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Value for Money2
Flow Security SystemsThe Flow Security Systems Non-Vented Locking Fuel Tank Cap | For Transfer Tanks & Above Ground Commercial Tanks | Prevents Theft & Fuel Vandalism | Secures Fuel Tanks | FSS 376M | Male 2" Std Thead
9.5 Durability9.3 Easy installation9.1 worth the moneyWhy we love it
Heavy-duty locking cap prevents fuel theft.
Retaining chain prevents loss during refueling.
Easy installation and secure locking mechanism.
9.7Exceptional
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3
JYINCPEDTransfer Tank Vented Fuel Cap w/Threaded Neck,Diesel Tank Cap with 2 Inch Base,Fuel Venting Pressure Gas Fill Lid for Diesel Transfer/Auxiliary/Storage Truck Tool Box
Main highlights- Prevent Leaking: Transfer tank fuel cap with spring loading and inside gasket is seal when tightly closing to prevent leaking and excess gas vapor venting even drive in road.
- Heavy-duty Transfer Fuel Tank Cap: Made of high quality materials featuring waterproof and corrosion resistance to long term serve your diesel tank. The whole tank pressure fill cap includes a removable transfer tank vented gas cap and2 inch heavy-duty cast iron base.
- Fitment: Transfer tank vented cap replace for Dee Zee Fill-Rite transfer tank cap and fit for standard 2" NPT threaded tank bung base. Diesel tank cap works well for ground, farm, commercial and distillate tanks, such as transfer tank, fuel tank, gas tank, diesel tank, auxiliary fuel tank, mobile fuel tank and weather guard tank.
- Easy to Use: Align the vented gas cap with the notch, push down and clockwise twisting to tighten the diesel tank cap all the way. To remove transfer tank cap, counter-clockwise twist slowly to the notch to vent pressure. Push down and twist to lift pressure vent fuel cap and remove.
- Both Directions Vent: When loosing the diesel tank cap, the venting pressure tank cap vent pressure inside the fuel tank to outside and release dangerous vapor build up to prevent over-expansion of the diesel fuel tank. And vented fuel cap allow air into the diesel transfer tank to prevent vacuum forming and collapse the tank when you draw out fuel.
- Added Security for Diesel Tanks Fuel: Lockable diesel fuel tank cap fit for 1/4" - 5/16" diameter shackle padlock (not included), which secure your fuel tanks and prevent costly oil fuel from theft,tampering, siphoning and vandalism. Just put a padlock in lock hole that is right on one of the tabs on the base and the tabs will hold the lock.
9.6Exceptional
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4
JYINCPEDTransfer Tank Vented Fuel Diesel Tank Cap,Venting Pressure Fuel Gas Cap for 2 Inch Base,Diesel Transfer Fill Lid for Auxiliary/Storage Truck Tool Box-Only Include Fill Lid
Main highlights- Prevent Leaking: Fuel transfer tank cap with spring loading and inside gasket is seal when tightly closing to prevent leaking and excess gas vapor venting even drive in road.
- Heavy-duty Diesel Tank Cap: Made of high quality materials featuring waterproof and corrosion resistance to long term serve your diesel tank. The transfer tank vented cap package only includes a removable transfer tank fuel cap.
- Fitment: Transfer tank vented cap replace for Dee Zee Fill-Rite venting pressure tank cap and fit for standard 2" NPT threaded tank bung base. Diesel tank cap works well for ground, farm, commercial and distillate tanks, such as transfer tank, fuel tank, gas tank, diesel tank, auxiliary fuel tank, mobile fuel tank and weather guard tank.
- Easy to Use: Align the transfer tank fuel cap with the notch, push down and clockwise twisting to tighten the diesel tank cap all the way. To remove transfer tank cap, counter-clockwise twist slowly to the notch to vent pressure. Push down and twist to lift pressure vent cap and remove.
- Both Directions Vent: When loosing the cap, the transfer diesel tank cap vent pressure inside the tank to outside and release dangerous vapor build up to prevent over-expansion of the fuel tank. And allow air into the diesel transfer tank to prevent vacuum forming and collapse the tank when you draw out fuel.
9.5Excellent
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5
StantStant Saddle Tank Fuel Cap for Select HD Applications with 2 Inch Pipe Threads
Main highlights- Unlike other aftermarket fuel caps, Stant fuel caps include all of the safety features found on the original equipment cap.
- Made of durable material for a long lasting life.
- Heavy duty fuel cap to replace lost or worn fuel cap.
- Customer safety is an important feature of Stant products.
9.4Excellent
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6
DEE ZEEDee Zee DZGASCAP Transfer Tank Vented Cap w/ Threaded Neck
Main highlights- Vented Gas Cap with Threaded Neck
- Sold Individually
- Replaces Dee Zee Transfer Tank Cap
- Alleviates Dangerous Build Up of Vapor
9.2Excellent
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7
DICMICDICMIC Vented Cap with Threaded Neck - Diesel Tank Cap for Transfer & Storage
Main highlights- [NOTICE] For any reason, if you are not satisfied with your purchase, contact us directly.
- [HIGH QUALITY] Made of high-quality materials featuring waterproof and corrosion resistance to long term serve your diesel tank. The whole tank pressure fill cap includes a removable transfer tank vented gas cap and 2-inch heavy-duty cast iron base.
- [FUNCTION] When loosen the cap, the venting pressure tank cap vent pressure inside the tank to outside and release dangerous vapor build up to prevent over-expansion of the fuel tank. And allow air into the diesel transfer tank to prevent vacuum forming and collapse the tank when you draw out fuel.
- [FITMENT] Works well for ground, farm, commercial and distillate tanks, such as transfer tank, fuel tank, gas tank, diesel tank, auxiliary fuel tank, mobile fuel tank and weather guard tank.
- [EASY TO INSTALL] Align the vented gas cap with the notch, push down and clockwise twisting to tighten the diesel tank cap all the way. To remove transfer tank cap, counter-clockwise twist slowly to the notch to vent pressure. Push down and twist to lift pressure vent cap and remove.
9.0Excellent
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8
Toyota31% OffToyota Genuine Parts - Cap Assy, Fuel Tank (77300-07030)
Why we love it
OEM quality ensures reliability.
Direct fit for easy installation.
Built to last long.
8.9Very Good
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9
Mopar20% OffMopar 5278632AG Fuel Tank Cap
Main highlights- Product Type: Auto Part
- Package Weight: 2.22 lbs
- Package Quantity: 1
- Package Dimensions: 3.81 cms (L) x 11.43 cms (W) x 19.812 cms (H)
8.8Very Good
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10
ACDelcoACDelco GM Original Equipment GT295 Fuel Tank Filler Cap , Yellow
Main highlights- Provides a tight seal to keep your vehicle's fuel tank closed
- Prevents lost fuel in order to help reduce your trips to the gas station
- Offering the quality, reliability, and durability of GM OE
- GM-recommended replacement part for your GM vehicle’s original factory component
- A sealed fuel tank reduces vapor emissions which helps the environment
8.7Very Good
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