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Engine Parts & Service - Fuel Tanks
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Marine Fuel Tanks & Accessories That Keep Your Engine Running Clean and Your Boat Moving
Whether you're rigging a small aluminum fishing boat or maintaining a larger outboard setup, having the right marine fuel tank and supporting hardware makes every outing safer and more reliable. This collection brings together portable fuel tanks, tank straps, fuel caps, and tank cleaning solutions from trusted brands like Attwood Marine, Sea-Dog, BoatBuckle, and Star brite — everything you need to fuel up with confidence and keep your system in top shape.
What You'll Find in This Collection
- Right-sized capacity for your setup — compact 3-gallon tanks for kayak motors and small tenders, or the Attwood 12-gallon portable fuel tank with built-in gauge for longer runs on larger outboards.
- Low-profile design when deck space is tight — the Attwood low-profile 12-gallon tank fits under gunwales or in shallow storage compartments where standard tanks won't clear.
- Secure transport on rough water — tank straps like the Sea-Dog nylon and 304 stainless steel strap hold tanks firmly in place even when wakes and chop are working against you.
- Cleaner fuel, fewer headaches — Star brite Star-Tron concentrated fuel tank cleaner dissolves varnish, sludge, and ethanol deposits that build up in tanks sitting over winter or between seasons.
- For boaters who skip the gauge — gauge-free tank options are available for setups where you track fuel separately or prefer a simpler, lighter build.
How to Choose the Right Fuel Tank Setup for Your Boat
Start with capacity. A 3-gallon tank suits small electric-start motors and short-range day trips, while a 6- or 12-gallon tank is a better fit for full-day outings or higher-displacement engines that drink more fuel at cruising speed. If your storage area has height restrictions, a low-profile design is worth prioritizing over a standard upright tank.
Next, consider the gauge. Built-in fuel gauges are genuinely useful on longer runs when you can't easily lift the tank to check weight. For shorter trips or when a tank lives in an enclosed compartment, a gauge-free model keeps things straightforward.
Finally, don't overlook retention and maintenance. A quality strap set keeps your portable tank from shifting underway — an important safety detail. And if a tank has been stored with old fuel, a concentrated cleaner used before the season can prevent starting issues and protect fuel lines downstream.
Frequently Asked Questions about Engine Parts & Service - Fuel Tanks
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Portable fuel tanks are used to store and supply gasoline or diesel to a boat's outboard motor, providing a removable, self-contained fuel source that can be refilled off the vessel. Most portable fuel tanks are available in sizes ranging from 3 to 12 gallons to suit different engine sizes and trip lengths.
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Portable marine fuel tanks are designed for boaters who use outboard motors and need a removable, refillable fuel source rather than a built-in tank. They are especially practical for small boat owners, kayak anglers with trolling motors, and anyone who wants the flexibility to refuel away from the water.
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Secure a marine fuel tank using nylon webbing straps with stainless steel hardware, running the strap around the tank and fastening it tightly to a fixed point on the deck or hull. Proper tank straps prevent the tank from shifting underway, which reduces spill risk and keeps the fuel line connection stable.
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The right fuel tank size depends on your outboard motor's fuel consumption rate and the length of your typical trip, with 3-gallon tanks suiting small trolling motors and 12-gallon tanks better matched to larger outboards. A general rule is to carry enough fuel for your round trip plus a safety reserve of at least one-third extra.
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Yes, a fuel tank with a built-in gauge is worth it for most boaters because the gauge lets you monitor remaining fuel at a glance without removing the cap or estimating by weight. Tanks without a gauge cost less and have fewer parts that can fail, making them a reasonable choice for short, predictable trips where fuel levels are easy to track.
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Clean the inside of a marine fuel tank by adding a concentrated fuel tank cleaner formulated for gas or diesel, then allowing it to circulate through the system to break down varnish, sludge, and microbial growth. Regular cleaning helps restore fuel flow, prevents injector and carburetor buildup, and extends the overall life of the tank and engine components.
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Marine fuel tank straps are typically made from nylon webbing combined with 304 stainless steel hardware, a pairing chosen because nylon resists UV exposure and moisture while stainless steel hardware resists corrosion in saltwater and freshwater environments. This combination keeps the strap strong and reliable across seasons without rusting or degrading quickly.
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Yes, portable marine fuel tanks and their caps sold in the United States must meet EPA certification standards that limit evaporative fuel emissions. EPA-certified fuel tank caps include a tether to prevent loss and are designed with seals that reduce hydrocarbon vapors from escaping, which matters both for environmental compliance and for reducing fume buildup in enclosed boat storage areas.
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Store a portable marine fuel tank in a cool, ventilated area away from direct sunlight, heat sources, and enclosed spaces where fuel vapors could accumulate. For long-term storage, treat the fuel with a stabilizer to prevent varnish buildup, and keep the tank either completely full to minimize condensation or completely empty and dry depending on the manufacturer's recommendation.
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A portable fuel tank sits on deck and can be removed for refueling, cleaning, or replacement, while a built-in tank is permanently mounted inside the hull and connected to a fixed fuel system. Portable tanks offer more flexibility and lower upfront cost, but built-in tanks typically hold more fuel and are better suited to larger boats with higher fuel demands.