Portable/Topside Tanks

What Are Portable and Topside Marine Fuel Tanks?

Portable and topside fuel tanks are self-contained, above-deck fuel storage solutions designed to power outboard motors and small marine engines. Unlike permanent below-deck tanks that are built into a vessel, portable and topside tanks are freestanding, typically made from high-density polyethylene (HDPE), and can be removed for easy refueling, storage, or replacement. They are a go-to choice for center consoles, jon boats, pontoons, dinghies, and inflatables where a built-in fuel system would be impractical or unnecessary.

These tanks serve a critical role in keeping your day on the water safe and uninterrupted. A well-chosen tank not only holds enough fuel for your trip but also prevents vapor leaks, resists UV degradation and corrosion, and complies with modern environmental standards. Since 2011, all portable marine fuel tanks sold in the U.S. must meet EPA and CARB low-permeation regulations, which minimize fuel vapor emissions and help retain octane value over time. When shopping for a portable tank, key factors to consider include capacity (typically ranging from 3 to 12+ gallons), hull compatibility, whether you need a built-in fuel gauge, and certification compliance for your state.

What to Look for When Buying a Portable Marine Fuel Tank

• Capacity: Match tank size to your engine's fuel consumption and the length of your typical outing. Compact 3-gallon tanks suit small trolling motors, while 12-gallon options handle longer runs on larger outboards.
• EPA/CARB Compliance: All U.S.-sold tanks must meet current EPA and CARB low-permeation standards. Look for tanks with a certified two-way vented cap that safely manages pressure buildup.
• Material & Construction: Multi-layer coextruded HDPE/EVOH and cross-linked polyethylene are the gold standards for durability, fuel retention, and ethanol-blended fuel compatibility.
• Built-in Fuel Gauge: Many tanks include a combination fuel pick-up and sight gauge so you can monitor fuel levels at a glance without disconnecting the line.
• Form Factor: Low-profile tanks fit neatly under seats, while taller configurations maximize capacity in open deck areas. Bow-shaped tanks are available for inflatables and small dinghies.
• Fitting Compatibility: Most tanks use standard 1/4" NPT marine fittings, ensuring compatibility with major outboard brands including Mercury, Yamaha, Honda, and Johnson/Evinrude.

Top Brands in Portable & Topside Marine Fuel Tanks

Moeller is widely regarded as the industry benchmark in marine fuel containment. Moeller's portable and topside tanks are manufactured from high-density polyethylene with UV inhibitors and meet all ABYC/NMMA/EPA/CARB requirements. Their topside line offers an EPA-certified solution for center console, pontoon, deck, and jon boat applications, with innovative features like a 360-degree rotating fuel withdrawal assembly that reduces fuel line kinks.

Scepter brings over 50 years of portable marine fuel tank experience to the market. Scepter tanks are built around a seamless, one-piece UV-stabilized cross-linked polyethylene shell and incorporate the same low-permeation technology used by leading boat builders in their below-deck OEM tanks — virtually eliminating fuel evaporation and preserving octane longer.

Attwood Marine has been an award-winning leader in marine product engineering for over 100 years. Attwood's portable fuel tanks are constructed of multi-layer coextruded HDPE and EVOH — the same material found in automotive fuel systems — and feature an exclusive automatic vacuum valve that ensures proper fuel flow without the need for manual venting.