We consider a marine gas tank cap to be a worthy investment in the long run. Let’s take you step by step, type by type, and find the best marine gas tank cap for you.

Our review process: Show/Hide

Our Top Picks:

Best Overall: Buy: Attwood Fill Cap READ REVIEW

Best For Use: Buy: Moeller New Tank READ REVIEW

Best For High Value: Buy: Attwood Marine Gas Tank Cap READ REVIEW

Best For Easy Installation: Buy: Perko Marine Gas Tank Cap READ REVIEW

Best For Perfect Fit: Buy: Perko Fill Cap READ REVIEW

Best For Good Quality: Buy: Moeller Marine Gas Tank Cap READ REVIEW

Best For Safety Chain: Buy: Nrcxrc Marine Gas Tank Cap READ REVIEW

Best For Wide Application: Buy: Acouto Marine Gas Tank Cap READ REVIEW

Best For Light Weight: Buy: Longzhuo Marine Gas Tank Cap READ REVIEW

Best For Reasonable Price: Buy: Qiilu Tool Marine Gas Tank Cap READ REVIEW

Best Overall: Attwood Fill Cap

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Not everyone likes to purchase a cap for their daily usage, but the Attwood Fill Cap would be an anomoly. The attwood fill cap is great for very heavy duty, is good for good quality and it is very durable. Make sure this fits by entering your model number. Moreover, it comes with a built-in vacuum valve, means no need for manual venting.

The cap works perfectly and it makes for solid construction. Lastly, the attwood fill cap looks good and it is white.

Almost all customers opine that the tank makes it roll at the slightest movement. Also, a few strongly agree that the tank is designed for vertical use. And, a few also found that the tanks are thick with a fitting for a fuel line. To sum up, buyers found this to be one of the best cap for daily purposes.

• This will swell to the point that it will eventually begin to release gas.
• It has hold plenty, it looks well made and has a portable design.
• The cap with built-in vacuum valve means no need for manual venting.
• This is a 5 - minute job and will help ensure everything works perfectly.

Best For Use: Moeller New Tank

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Moeller makes beautiful and great caps with classic and smartly chosen materials. And, the modern new tank with fast shipping, is good for the country of origin and it is much better. Make sure this fits by entering your model number. Also, this is safer, makes for a great replacement and it is black. Lastly, the modern new tank is available in a total of 3 different colors: black (4-bundle), black (2-bundle) and black.

Most buyers agree that the tank is designed for use on portable gas tanks 2010 or older. Further, they say that the tank fits moller and tempo above deck portable marine fuel tanks only. Also, they also found that this cap solves that problem by simply venting the tank vapor into the atmosphere whenever the vent is open. In short, the tone of buyers is very positive and we believe that the tank suits the purpose.

• The vented gas cap fits perfectly on the 3 gallon attwood tank.
• This works well vents properly and it works well.
• This will fit if it has a plastic tank on the pontoon.
• This fits the 3 gallon west marine (attwood) boat gas tank.

Best For High Value: Attwood Marine Gas Tank Cap

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We know from years of feedback from readers, amazon sellers, and family and friends what most people want in a convenient and appropriate cap. The Attwood Marine Gas Tank Cap is exactly that - it's a simple cap that hits all the right notes. The attwood marine gas tank cap comes with a built-in vacuum valve, means no need for manual venting. Make sure this fits by entering your model number. Furthermore, the cap is white and it is much better.

The cap is great for a reasonable price and it is designed for a great price. Further, it is great for perfect size and it works well for good quality. Above all, the attwood marine gas tank cap is very durable and it is very nice.

Almost all buyers opine that the tank is perfect in the pontoon box, very sturdy and the gauge makes it easy to see the amount of fuel in the tank. Further, they say that the tank is a really good gas tank. Moreover, a few say that the tank is easy to carry, great combo with the universal male, female sprayless connector. To sum up, most buyers agree that the cap suits them best, and no one questions it.

• Automotive-grade, multi-layer construction withstands the pressure build-up associated with closed fuel systems.
• This is a ventless tank and is going to swell in the heat.
• The tank is designed to expand and contract with the change of internal pressure.
• This tank does blow up like a balloon when full and in the sun.

Best For Easy Installation: Perko Marine Gas Tank Cap

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The Perko Marine Gas Tank Cap might be a relatively new release, but it's still nothing short of impressive this year, thanks to multiple price cuts and added new features over the past few months. The perko marine gas tank cap is made for easy installation, comes with a screw size, It is great for fast delivery and has a good design. Make sure this fits by entering your model number. Further, the cap is built with quality materials.

Finally, the perko marine gastank cap can be trusted for good quality, It is black and has a portable design.

Most buyers quickly discover that the tank is plastic but it doesn’t feel fragile. Furthermore, a few also found that the tank is for use through the boat hull with hoses. Moreover, a few say that the cap can be used on portable marine tanks for hauling fuel. In short, buyers found this to be one of the best cap for daily purposes.

• This match for oem fill additionally fits well, matched others on the boat.
• This is built for easy install, works perfectly and it allows for great fit.
• This fits the 1999 smoker craft perfectly.
• This works well because it has been installed for 6 months.

Best For Perfect Fit: Perko Fill Cap

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The Perko Fill Cap's superior materials makes sure that it ages well with use. The perko fill cap is built with quality materials. Make sure this fits by entering your model number. Further, the cap has mounting screws, is designed for easy installing and it is black. Finally, the perko fill cap fit well and it worked perfectly.

Almost all customers found that the cap is easy to install and worked well, They are plastic threads in a steel thread so it may need to be replaced every season. And, a few also found that the cap has to be boat threaded fuel caps. Further, a few strongly agree that this item is the cap only regardless of the picture.

• This is an excellent shopping experience.
• One of the newcomers and featured product.

Best For Good Quality: Moeller Marine Gas Tank Cap

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We know from years of feedback from readers, amazon sellers, and family and friends what most people want in a convenient and appropriate tank. The Moeller Marine Gas Tank Cap is exactly that - it's a simple tank that hits all the right notes. Make sure this fits by entering your model number. And, the tank works perfectly and it is good good quality. In conclusion, with a 4.6 rating and more than 536 buyers, the modern marine gas tank cap stands as the best choice.

Most buyers agree that the tank is not EPS compliant but works great, self venting with no tank bulging or shrinking. Further, they also found that the cap works well, no swollen tank from florida heat. Overall, for most customers, the cap was just what they wanted.

• Moeller external threaded manual vented replacement gas cap.
• Good investment for the long term.

Best For Safety Chain: Nrcxrc Marine Gas Tank Cap

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The Nrcxrc Marine Gas Tank Cap should be able to handle its purpose and duties with ease. The nrcxrc marinegas tankcap is very nice, It is preservative and has a keyless design. Lift the built-in tab on the cap and turn it to open or close. And, the tank is perfect for safety chain and it has lost wax process. Finally, the nrcxrc marine gas tank cap is beautiful and has a good design.

One customer says - "Years ago, a 40 year old searay fuel cap chain broke. ". Most customers quickly discovered that the tank is a polished piece and is sturdy.

• Lost wax process and cover surface polished.
• Complete with stainless steel retaining chain, to avoid losing or misplacing the cap.
• The cap contains a high - grade o-ring seal.

Best For Wide Application: Acouto Marine Gas Tank Cap

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Acouto offers a variety of caps for personal choice and yet maintains quality in all the variants. The Acouto Marine Gas Tank Cap is always at your service. Ideal and direct replacement for old or damaged boat fuel tank vent, dependable to use. The boat fuel tank vent adopts a professional manufacturing process, with stable performance, high precision and good reliability.

Above all, the acouto marine gastank cap is 100% brand new and high quality marine boat fuel vent.

Overall, many customers have used the cap for more than a few months without letup, and it shows no sign of giving up.

• This is suitable for boats, marine,s ships, yachts, high-speed rail bus cabin,s cabin ventilation, etc.
• This is made for wide applications and it is salt water resistant.
• The manufacture of the boat fuel line vent meets the strict quality requirements.

Best For Light Weight: Longzhuo Marine Gas Tank Cap

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Best part: Longzhuo Marine Gas Tank Cap costs comparatively low and it is available to ship in 24 hours. The longzhuo marinegas tank cap is easy to install, it can directly replace a large number of old or damaged ones. Make sure this fits by entering your model number. Moreover, the tank has good anti‑rust and anti‑corrosion performance and has a long service life.

Most importantly, the longzhuo marine gas tankcap is made of high‑quality abs plastic material, It is durable and practical in use.

• A good sealing effect prevents fuel leakage and prevents dust from entering the fuel tank.
• This is suitable for the 12l / 14l fuel tank of marine boats.
• Lot of satisfied buyers.

Best For Reasonable Price: Qiilu Tool Marine Gas Tank Cap

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We would, of course, be remiss if we didn't mention Qiilu Tool Marine Gas Tank Cap for daily purpose. The qiilu tool marine gas tank cap is made with high quality stainless steel for maximum durability. Make sure this fits by entering your model number. In addition, it is fitment and it is made of high quality material.

Lastly, the qiilu tool marine gas tank cap fits for boats, yachts, caravans, rv, trucks, tractors and trailer fuel tanks etc.

To sum up, the tone of buyers is very positive and we believe that the tank suits the purpose.

• 【Made of high quality made with high quality stainless steel for maximum durability.
• Humanization design, complete with stainless steel retaining chain, to avoid losing or misplacing the cap.
• 【Durable】anti-corrosion, anti-rust and wear resistant.excellent seawater corrosion resistance and high oxidation resistance.