Choosing the right outboard motor gas tank is critical for safe and reliable boating. We researched and compared seven top models based on manufacturer specifications, industry safety standards (ABYC, USCG), and aggregated owner feedback. Our evaluation focuses on fuel capacity, material durability, hose and connector quality, venting, and ease of transport. Whether you need a portable tank for a small dinghy or a larger tank for a fishing boat, this guide will help you find the best fit.
| Photo | Product | Score | Buy |
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Moeller Marine 6 Gallon Portable Fuel Tank Best Overall 6 gallon capacity, low-profile design, EPA/CARB compliant |
9.0 | 🛒 Check Price |
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Attwood 6 Gallon Portable Fuel Tank Best Value 6 gallon capacity, translucent tank, includes fuel cap and vent |
8.7 | 🛒 Check Price |
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Tempo Marine 12 Gallon Fuel Tank Best Large Capacity 12 gallon capacity, rectangular shape, includes fuel gauge and vented cap |
8.4 | 🛒 Check Price |
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Shurhold 3 Gallon Portable Fuel Tank Best Compact 3 gallon capacity, lightweight, includes hose and primer bulb |
8.1 | 🛒 Check Price |
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Marine Metal Products 6 Gallon Fuel Tank Best Metal Tank 6 gallon capacity, steel construction, red powder coat finish |
7.8 | 🛒 Check Price |
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Moeller Marine 3 Gallon Portable Fuel Tank Best for Small Motors 3 gallon capacity, low-profile, includes fuel hose and primer bulb |
7.3 | 🛒 Check Price |
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Attwood 3 Gallon Portable Fuel Tank Budget Pick 3 gallon capacity, translucent, includes cap and vent |
7.0 | 🛒 Check Price |
1. Moeller Marine 6 Gallon Portable Fuel Tank: Best Overall
The Moeller Marine 6 Gallon Portable Fuel Tank is a top choice for boaters who need a reliable, compact tank. We researched its low-profile design, which allows it to fit in tight spaces like under a bench seat or in a small locker. The tank is made from UV-stabilized polyethylene and meets EPA and CARB standards for low permeation. Owner feedback highlights the built-in fuel gauge as a convenient feature, though some users note that the included hose is only three feet long, which may require an extension for larger boats.
In our evaluation, this tank offers excellent value for its size and build quality. However, if you need a larger capacity for extended trips, you may want to consider a 12-gallon model. This tank is best for small to mid-size outboards up to 30 HP and for boaters who prioritize portability and storage flexibility.
- Low-profile design fits under seats and in small compartments
- Built-in fuel gauge for easy monitoring
- Includes 3/8-inch fuel hose with primer bulb and connector
Pros: Sturdy polyethylene construction resists impacts; Easy to carry with molded handle
Cons: Hose may be too short for some installations
2. Attwood 6 Gallon Portable Fuel Tank: Best Value
The Attwood 6 Gallon Portable Fuel Tank is a budget-friendly option that doesn’t skimp on quality. We compared its translucent design, which lets you see the fuel level at a glance, eliminating the need for a gauge. The tank is made from high-density polyethylene with UV inhibitors to resist sun damage. Owner reviews consistently praise its reliability and leak-free performance. However, some users mention that the fuel cap vent can be stiff to operate.
This tank is ideal for casual boaters or those on a budget who need a dependable portable fuel solution. If you prefer a built-in gauge or need a larger capacity, you might look elsewhere. It performs well with outboards up to 25 HP and is easy to carry with its built-in handle.
- Translucent tank allows easy visual fuel level check
- Durable HDPE construction with UV inhibitors
- Compatible with most outboard fuel connectors
Pros: Affordable price point; Easy to see fuel level without a gauge
Cons: No built-in fuel gauge
3. Tempo Marine 12 Gallon Fuel Tank: Best Large Capacity
The Tempo Marine 12 Gallon Fuel Tank is designed for boaters who need to go the distance. We researched its rectangular shape, which fits well in larger boat lockers and provides a low center of gravity. The tank includes a fuel gauge and a vented cap that meets USCG requirements. Based on owner feedback, the tank is well-built and resists leaks, but its weight when full can make it difficult to carry or move without assistance.
This tank is best suited for boats with outboards up to 50 HP or for those who want to avoid frequent refueling. If you have limited storage space or need a portable tank for a small boat, the 6-gallon models are more practical. The Tempo tank is a solid choice for serious anglers or long-distance cruisers.
- Large 12-gallon capacity for extended trips
- Rectangular shape maximizes storage space
- Integrated fuel gauge with easy-to-read dial
Pros: Long run time for larger outboards; Stable shape prevents tipping
Cons: Heavy when full (approx. 80 lbs)
4. Shurhold 3 Gallon Portable Fuel Tank: Best Compact
The Shurhold 3 Gallon Portable Fuel Tank is a compact solution for small boats, kayaks, and inflatables. We evaluated its lightweight construction, which makes it easy to carry even when full. The tank comes with a 5-foot hose and primer bulb, allowing flexible placement. Owner reviews note that it works well with trolling motors and small outboards, but some wish the hose were longer for larger setups.
This tank is ideal for those with a small dinghy or a portable outboard motor. If you need more than a couple of hours of run time, consider a larger tank. The Shurhold is a niche product but excels in its category for portability and convenience.
- Ultra-lightweight design for easy transport
- Compact size fits in small kayaks or inflatables
- Includes 5-foot fuel hose with primer bulb
Pros: Perfect for small outboards (2-8 HP); Easy to store and carry
Cons: Small capacity limits run time
5. Marine Metal Products 6 Gallon Fuel Tank: Best Metal Tank
The Marine Metal Products 6 Gallon Fuel Tank is a traditional steel tank for those who prefer metal over plastic. We researched its heavy-gauge steel construction and powder-coated finish, which offers good corrosion resistance. The tank includes a brass shut-off valve and a vented cap. Based on owner feedback, the tank is extremely durable but heavy, especially when full. Some users report rust developing if the paint is chipped, requiring touch-up.
This tank is best for boaters who prioritize ruggedness and don’t mind the extra weight. It may not be ideal for portable use or for boats where weight is a concern. If you need a tank that can take abuse, this is a strong contender, but plastic tanks offer better value for most.
- Heavy-duty steel construction for extreme durability
- Red powder coat finish resists corrosion
- Includes brass fuel shut-off valve
Pros: Virtually indestructible; Classic look
Cons: Heavy and prone to rust if scratched
6. Moeller Marine 3 Gallon Portable Fuel Tank: Best for Small Motors
The Moeller Marine 3 Gallon Portable Fuel Tank is a smaller sibling to the 6-gallon model. We compared its specs and found it suitable for very small outboards (2-5 HP). The tank is made from the same durable polyethylene and has a low profile. However, owner feedback indicates that the lack of a fuel gauge is a drawback, and some users wish the hose were longer. It’s a basic tank that gets the job done.
This tank is best for those with a tiny motor or as a backup tank. If you need more capacity or a gauge, the 6-gallon Moeller is a better choice. It’s a budget-friendly option but lacks some features found on competitors.
- Low-profile design fits under seats
- Lightweight and easy to carry
- Compatible with most small outboards
Pros: Good for trolling motors and small engines; Affordable
Cons: No fuel gauge; Hose may be too short for some setups
7. Attwood 3 Gallon Portable Fuel Tank: Budget Pick
The Attwood 3 Gallon Portable Fuel Tank is the most budget-friendly option in our lineup. We evaluated its translucent design, which allows you to see fuel level, but the plastic feels thinner than other models. Owner reviews are mixed: some appreciate the low cost, while others report cracking after a few seasons. The tank does not come with a primer bulb or hose, so you’ll need to purchase those separately.
This tank is suitable for occasional use or for those on a tight budget. If you plan to use it frequently or in rough conditions, consider spending a bit more on a sturdier model. It works for small motors but lacks the durability of the Moeller or Attwood 6-gallon tanks.
- Translucent tank for visual fuel check
- Lightweight and portable
- Compatible with standard fuel connectors
Pros: Very affordable; Simple design
Cons: Thinner plastic may be less durable; No primer bulb included
Frequently Asked Questions
What size outboard motor gas tank do I need?
The size depends on your engine’s fuel consumption and how long you plan to run. A general rule is 1 gallon per hour for every 10 HP. For small outboards (2-10 HP), a 3-gallon tank may suffice. For mid-range (15-30 HP), a 6-gallon tank is common. For larger engines (40+ HP), consider a 12-gallon tank or more. Always check your engine’s fuel line connector compatibility.
Are plastic or metal outboard gas tanks better?
Plastic tanks (polyethylene) are lighter, corrosion-resistant, and less expensive. They are the most common choice for portable tanks. Metal tanks (steel) are more durable and impact-resistant but heavier and prone to rust if the coating is damaged. For most boaters, plastic is the better option due to weight and cost. Metal tanks are preferred for permanent installations or extreme environments.
How do I properly vent an outboard gas tank?
Most portable tanks have a vented cap that allows air to enter as fuel is drawn out. Always ensure the vent is open when the engine is running and closed when transporting or storing. Some tanks have an automatic venting system. Check your tank’s manual for proper operation. Improper venting can cause vacuum lock or fuel spillage.
Can I use an outboard gas tank for other engines?
Outboard gas tanks are designed for marine engines and often include a primer bulb and specific fuel line connectors. They can be used with other small engines (generators, lawn mowers) if the connector matches, but ensure the tank is approved for gasoline and has proper venting. However, marine tanks are built to withstand vibration and moisture, making them suitable for various applications.
How do I maintain my outboard gas tank?
Regular maintenance includes checking for cracks or leaks, cleaning the fuel filter, and replacing old fuel (gasoline degrades in 30 days). Use fuel stabilizer if storing for more than a month. Inspect the fuel hose and primer bulb for cracks or stiffness. Store the tank in a cool, dry place with the vent closed to prevent moisture ingress.
Our Verdict
After researching and comparing the top outboard motor gas tanks, our top pick is the Moeller Marine 6 Gallon Portable Fuel Tank for its excellent balance of capacity, durability, and features like a built-in fuel gauge. For a budget-friendly option, the Attwood 6 Gallon Portable Fuel Tank offers great value with its translucent design. Choose based on your engine size and how often you go boating.
