Attwood Marine Portable Fuel Tank, EPA/CARB, 1/4 in NPT, Multi-Layer HDPE/EVOH

Overview

This Attwood Marine portable fuel tank is an above-deck fuel tank range for outboard boats and other small-engine applications that need removable gasoline storage. The range covers 3, 6, and 12 gallon capacities, with gauge and no-gauge versions, so it can match anything from a small dinghy or kicker motor to a pontoon or utility boat that needs more reserve fuel on board.

Each tank uses multi-layer HDPE/EVOH construction to help reduce fuel vapor loss and handle the pressure build-up found in closed fuel systems. The tanks are compatible with 1/4-inch NPT fuel fittings and use an EPA-style cap with an automatic high-flow vacuum valve, so there is no manual vent screw to open or close before running the engine.

The range is built for portable marine use, with EPA and CARB compliance, ABYC/NMMA portable fuel tank requirements, and compatibility with ethanol-blended fuels. The 3 gallon size measures 16.6 in. L x 11.45 in. W x 7.3 in. H, the 6 gallon size measures 19.82 in. L x 13.5 in. W x 9.16 in. H, and the 12 gallon size measures about 22.75 in. L x 14.25 in. W x 14.47 in. H.

Key features

• Available in 3, 6, and 12 gallon capacities for matching fuel storage to the boat size, engine demand, and available deck or cockpit space.
• Gauge and no-gauge versions let the setup stay simple or add at-a-glance fuel level reading where that is useful.
• Compatible with 1/4-inch NPT fuel fittings for use with standard portable outboard fuel line setups.
• EPA cap with automatic high-flow vacuum valve removes the need for a manual vent screw during normal operation.
• Multi-layer HDPE/EVOH tank construction helps limit gasoline vapor permeation and supports use in closed fuel systems.
• Meets EPA and CARB requirements and complies with ABYC/NMMA requirements for portable marine fuel tanks.
• Compatible with ethanol-blended fuels, a practical detail for boats that refuel at roadside or marina gasoline pumps.
• Ergonomic carry handle makes the tank easier to move between storage, dock, tender, and boat.

Variants

This portable fuel tank range varies by fuel capacity and fuel gauge configuration. The 3 gallon versions suit small outboards, tenders, inflatables, jon boats, and auxiliary engines where compact storage matters. The 6 gallon versions give a common portable-tank size for many outboard setups. The 12 gallon versions fit boats that need more run time between refills, such as pontoons, skiffs, and utility boats with more deck space.

The gauge option is the main functional difference within each capacity. Versions with a gauge give a quick visual fuel-level check at the tank, while no-gauge versions keep the tank simpler for users who already track fuel by use, refill routine, or separate equipment. Core construction, fitting compatibility, vented cap design, and compliance details remain consistent across the range where confirmed for these models.

Installation and fit

This is a portable above-deck tank, so placement should allow the tank to sit level, stay secured while underway, and keep the cap and fuel connection accessible. The selected capacity should be checked against the actual storage area before purchase, especially on small boats where seat bases, lockers, battery boxes, and steering cables can limit usable space.

Fuel line is not included, so the installation should be planned around a compatible portable outboard fuel line assembly and the correct 1/4-inch NPT tank fitting. Thread sealant should be used when connecting fittings, and the tank should be secured so it cannot slide, tip, or rub against sharp hardware in chop or during trailering.

Use on board

This tank range is a good match for boaters who want a removable fuel supply for small outboards, tenders, fishing boats, auxiliary motors, or pontoon use. The closed-system cap and low-permeation tank construction are useful around cockpits, decks, and storage areas where fuel vapor, spray, UV exposure, and regular handling are part of normal boating.

For regular use, keep the tank out of standing water when possible, inspect the fuel fitting and cap seal before trips, and avoid overfilling so the tank has room for fuel expansion. A gauge version can make quick checks easier at the dock or ramp, while a no-gauge version works well for simple setups where the tank is refilled or measured before each run.