Best Diesel Fuel Tanks for Boats: Top Picks for Extended Boat Range
Answering the common buyer need: these diesel fuel tanks for boats are selected to maximize capacity, durability, and compatibility while fitting different boat layouts. This guide targets boaters needing reliable auxiliary or primary fuel storage, including offshore anglers, weekend cruisers, and long-range travelers. Each option is evaluated for best use case: compact space savings, corrosion resistance, or easy installation. A quick summary table follows to compare key details at a glance.
| Product | Capacity | Best For | |
|---|---|---|---|
| RDS MFG INC General-Purpose Marine Fuel Tank – 13-Gallon | 13 gal | Small boats or secondary fueling needs | Versatile dimensions; top-siphon allowed |
| RDS MFG INC 62533 General Purpose Tank-18Gal | 18 gal | Extra capacity for factory-tan k extensions | Fully welded seams; aluminum build |
| RDS MFG INC General-Purpose Fuel Tank – 18-Gallon | 18 gal | Standard replacement tank with gasoline capability | Gasoline auxiliary fueling supported |
| Moeller Marine Below Deck Permanent Fuel Tank (31-Gallon) | 31 gal | Mid-to-large boat installations needing more range | Durable aluminum build; 360° swivel fitting |
| Scepter 12 Gallon Portable Marine Gas Can | 12 gal | Portable backup or short-range runs | Two-way vented cap; built-in gauge |
RDS MFG INC General-Purpose Marine Fuel Tank – 13-Gallon
The 13-gallon RDS MFG INC marine fuel tank is designed for small- to mid-sized boats needing reliable auxiliary capacity. Best for boaters with tight engine compartments or limited under-seat space. The tank supports gasoline auxiliary fueling when siphoned from the top using an electric pump, providing flexible fueling options for mixed fuel configurations. A caution: ensure venting and fittings align with your boat’s fuel system to prevent leaks.
RDS MFG INC 62533 General Purpose Tank-18Gal
This 18-gallon general-purpose tank is suited for boats needing mid-range fuel capacity with long-term durability. Aluminum construction helps resist corrosion, and fully welded seams minimize seepage risk. Best for owners upgrading an older tank or expanding fuel capacity for cruising. Choose this if you want robust aluminum construction and a straightforward installation. Limitation: ensure compatibility with your vessel’s mounting space and existing fittings.
RDS MFG INC General-Purpose Fuel Tank – 18-Gallon
With the same 18-gallon capacity as the previous option, this tank emphasizes versatility and compatibility for various fuel types. Best for boaters who want a reliable replacement or additional primary tank. Siphon-top fueling using an electric pump is supported, which can simplify routine refueling. Limitation: verify top-siphon setup works with your current pump configuration.
Scepter 12 Gallon Portable Marine Gas Can
The Scepter 12-gallon portable tank is ideal for boats that require extended running time in a compact form. It includes a built-in fuel gauge and a two-way vented cap to regulate pressure and vapor release. Best for emergency backup or as a supplementary reserve for longer trips. A potential drawback: as a portable can, it may require extra mounting or securing on rough seas.
Moeller Marine Below Deck Permanent Fuel Tank (31-Gallon)
The 31-gallon Moeller tank is designed for below-deck installation, offering substantial capacity for longer trips. Best for larger boats or vessels where under-deck space can accommodate a permanent fuel tank. It features a machined aluminum 3/8 in. withdrawal fitting with a 360° swivel poplock for convenient hookups. Caution: permanent installation requires precise mounting and securing to avoid movement during heavy seas.
Buying Guide: Key Considerations For Choosing Diesel Fuel Tanks
- Capacity needs: Match tank size to your typical cruising range and available mounting space.
- Material and durability: Aluminum tanks resist corrosion; look for fully welded seams for fuel integrity.
- Fuel compatibility: Ensure the tank supports diesel and any blended fuels you use; consider gasoline-capable options only if applicable to your system.
- Installation type: Determine whether you need a below-deck permanent tank, an auxiliary rectangle tank, or a portable can for flexibility.
- Vent and fitment features: Check venting, fittings, and pickup design to ensure reliable fueling and minimal vapor risks.
- Maintenance and longevity: Look for corrosion resistance, robust fittings, and ease of inspection or replacement.
Frequently Asked Questions
- What capacity is best for a small boat? — For smaller boats, 13–18 gallons is often sufficient for short trips or as an auxiliary tank.
- Are aluminum tanks better than steel? — Aluminum tanks resist corrosion and are common in marine use, but ensure proper seals and fittings.
- Can I use these tanks for gasoline? — Some tanks support gasoline as a secondary fueling option; always verify manufacturer guidance and safety standards.
- What is important in a portable marine fuel can? — Look for built-in gauges, vented caps, and secure mounting options to avoid spills.
- How do I choose between permanent and portable tanks? — Permanent tanks save space and reduce clutter under deck, while portable tanks offer flexibility for temporary needs.
- Do these tanks require professional installation? — Permanent tank installations often benefit from professional mounting to ensure proper venting and structural support.