The best external boat fuel tank depends on the capacity you need and whether you want a fuel line included. The VEVOR 14.53-gallon tank suits boaters prioritizing extended fuel capacity; Scepter’s 12-gallon tank offers a built-in gauge and vented cap; and the Scepter 6-gallon tank is a more compact option. For a smaller tank with a hose, consider the VEVOR 3.17-gallon model, while the LAUCO 6.34-gallon option includes a longer fuel line and primer bulb.
| Product | Best for | Capacity | Fuel line included |
|---|---|---|---|
| VEVOR Marine Tank | Longer outings | 14.53 gallons | Yes |
| Scepter Portable Marine Gas Can | Large capacity and gauge | 12 gallons | No |
| Scepter Portable Marine Gas Can | Compact storage | 6 gallons | No |
| LAUCO Marine Fuel Tank | Mid-size tank with hose | 6.34 gallons | Yes |
| VEVOR Boat Fuel Tank | Small portable tank | 3.17 gallons | Yes |
VEVOR 14.53-Gallon Marine Tank
Best for: Boaters who need substantial portable fuel capacity for an outboard-powered fishing boat or deck boat. This tank holds 14.53 U.S. gallons and is made from high-density polyethylene described as resistant to aging, impact, and corrosion.
It includes a visual fuel gauge and a 9.8-foot hose with an 8 mm inner diameter. The listed hose compatibility is for Yamaha connectors, so confirm the connector matches your motor before buying. Separate inlet and outlet ports are intended to help keep fuel away from dirt and debris.
Limitation: The manufacturer advises filling the tank to 80% of capacity and avoiding prolonged direct sunlight, which may contribute to aging or expansion.
Scepter 12-Gallon Portable Marine Tank
Best for: Outboard boaters who want a large tank with an integrated fuel-level check. Its 12-gallon capacity supports longer periods between refills, while its compact profile is intended to help with transport and storage.
The built-in combination fuel pickup and sight gauge lets users check the fuel level. The two-way vented cap allows airflow during refueling and automatically releases pressure above 5 PSI, according to the product details. The tank accepts standard 1/4 NPT marine fittings and is listed as compatible with diesel and ethanol-blended fuels.
Limitation: The fuel line is sold separately. Check fitting requirements for your outboard and fuel setup before ordering.
Scepter 6-Gallon Portable Marine Tank
Best for: Owners who want a lower-capacity tank that is easier to carry between a boat and dock. Its integrated top handle and listed dimensions of 19.3 by 12.2 by 10.2 inches provide useful reference points when checking available storage space.
The tank uses a one-piece shell made from UV-stabilized, high-density polyethylene. It has a combination fuel pickup and sight gauge, an automatic air-inflow valve and fuel cap system, and compatibility with gasoline and ethanol-blended fuels. It accepts standard 1/4 NPT marine tank fittings.
Limitation: The supplied product information does not list a fuel line, so buyers may need to obtain a compatible line separately.
LAUCO 6.34-Gallon Marine Fuel Tank
Best for: Buyers seeking a mid-size portable tank with several fuel-delivery components included. The 6.34-gallon tank comes with a 9.8-foot fuel line, an integrated primer bulb, a marine connector, a vented cap, and a visual fuel-level gauge.
Compared with tanks that list no included hose, this package may reduce the need to source a line separately. Its gauge helps users monitor the remaining fuel, and the compact profile is described as convenient for boat storage and transport.
Limitation: The listed hose has an 8 mm inner diameter, but the product details do not name specific compatible motor brands. Verify connector fit before use.
VEVOR 3.17-Gallon Boat Fuel Tank
Best for: Small boats, compact storage areas, or boaters looking for a smaller portable tank. Its 3.17-gallon capacity and molded top handle make it easier to carry, and the listed design can fit under boat seats where space allows.
The tank is made from high-density polyethylene and includes a 9.8-foot hose with a 6 mm inner diameter. Its listed connector compatibility is for Yamaha connectors. The product details describe the material as resistant to aging, impact, and corrosion.
Limitation: Its lower capacity means more frequent refueling than the larger options. Check the hose connector and available under-seat clearance before choosing it.
Buying Guide: How to Choose an External Boat Fuel Tank
How much fuel capacity do you need?
Choose capacity based on your boat’s available storage and how much fuel your trips require. The 3.17- and 6-gallon options are smaller and easier to handle than the 12- and 14.53-gallon tanks. A larger tank can reduce refill interruptions, but it also takes up more room and is heavier when full.
Does the tank include the right fuel line?
Some options include a hose, while the Scepter models listed here require a separately sourced fuel line. Check hose length, inner diameter, connector type, and compatibility with your specific outboard. A hose listed for Yamaha connectors should not be assumed to fit another motor brand.
Which features make refueling and monitoring easier?
A built-in gauge or sight indicator can help you check remaining fuel. A vented cap manages airflow and pressure according to its product description. Look for these features if you want to monitor fuel levels without opening the tank, and follow the manufacturer’s instructions for filling and ventilation.
What should you check before installation?
- Confirm the tank fits the boat’s storage area and can be secured appropriately.
- Match fittings and fuel-line connectors to the outboard.
- Review the stated fuel compatibility and follow the tank’s instructions.
- Consider sunlight exposure; one VEVOR listing cautions against prolonged direct sunlight.
Frequently Asked Questions
What is an external boat fuel tank?
It is a portable or separate tank that stores fuel for an outboard motor and connects to the engine through a compatible fuel line.
Do all portable boat fuel tanks include a fuel line?
No. The LAUCO and VEVOR models described above include fuel lines, while the Scepter 12- and 6-gallon listings say the line is sold separately or do not list one.
How do I know whether a fuel tank will fit my outboard?
Check the tank’s connector type, hose diameter, and stated brand compatibility against your motor’s requirements. Confirm details with the manufacturer if they are unclear.
Is a larger external tank always the better choice?
No. A larger tank provides more capacity but needs more storage space and can be harder to carry. Choose the capacity that suits your trip and boat layout.
Why does a marine fuel tank need a vent?
A vent allows airflow and can help manage pressure as fuel is used or the tank is refilled. Follow the product instructions for safe handling and operation.