Answering the need for extra range or quicker refueling, these auxiliary fuel tanks are designed to expand a truck’s usable capacity. The top picks below are best for classic pickups and work trucks that require reliable, installable secondary fuel storage. Each listing is chosen for straightforward installation, compatibility with common truck fleets, and practical capacity ranges. This guide helps you compare options and decide which tank fits your intended use, whether you’re planning long highway hauls, worksite efficiency, or emergency reserve storage.
| Product | Capacity | Best For |
|---|---|---|
| Fuel Tank Kit – 19.5 Gallon In-Cab Non-Evap | 19.5 Gallons | Classic Ford F-100 (1961-1972) and similar era trucks |
| RDS MFG INC Rectangular Auxiliary Fuel Tank – 69 Gallon | 69 Gallons | Long-range highway runs and heavy-duty fleet use |
| RDS MFG INC Auxiliary Fuel Tank 40 Gal | 40 Gallons | Mid-size capacity increase for extended trips |
| RDS MFG INC Auxiliary Fuel Tank 37Gal – 71804 | 37 Gallons | Balanced capacity for everyday use with higher mobility |
| Fuel Tank With Drain 20 Gallon For 1948-1952 Ford F3 Pickup | 20 Gallons | Older/Fleet pickups requiring authentic-era compatibility |
Fuel Tank Kit For 1961-1972 Ford F-100 Pickup
The kit includes a fuel tank, sending unit, filler neck, and connector hose. Best for restoring or upgrading a classic truck fuel system. Suitable for buyers who want an all-in-one replacement compatible with Ford F-100 models from 1961 to 1972. The set emphasizes in-cab installation and a non-evaporative design, reducing emissions controls complexity. Caution: verify exact fitment for your model year and cab configuration to ensure proper alignment with your existing lines and mounting points.
RDS MFG INC Rectangular Auxiliary Tank 69 Gallon
Best for long trips or fleet operations needing substantial range without frequent refueling. The 69-gallon capacity supports extended highway runs and heavy-duty tasks. RDS offers a full assortment of tanks to fit different dimensions, with gasoline compatibility and a top-siphon delivery option via an electric pump. Limitation: overall footprint is large, so vehicle dimensions and mounting space must be verified before purchase.
RDS MFG INC 40 Gal Auxiliary Tank
Choose this 40-gallon option for a solid balance between additional range and vehicle practicality. It suits trucks that need extra miles between fill-ups without overwhelming the chassis or fuel system. The listing notes gasoline support and a general auto accessory category. Best for: users who want a sizable reserve while maintaining reasonable space usage. Caution: confirm installation clearances and mounting kits for your specific truck model.
RDS MFG INC Auxiliary Tank 37Gal – 71804
Best for buyers who want a slightly smaller but capable secondary tank with flexibility for mid-size pickups. This 37-gallon option is described as part of a broad tank lineup with gasoline compatibility. It’s a good fit for daily work trucks that still require extended reach. Limitation: product detail emphasizes the range of tank options; verify exact dimensions to ensure compatibility with mounting points and spare tire or tool compartment layout.
Fuel Tank With Drain 20 Gallon For 1948-1952 Ford F3
Best for authentic compatibility with older Ford F3 pickups and similar vintage fleets. The 20-gallon capacity provides a practical boost without dramatically increasing weight or size. This option is ideal for classic-truck enthusiasts maintaining period-correct builds. Caution: installation may require precise routing of lines and hardware suited to early-generation fuel systems.
Buying Guide: How To Choose A Second Fuel Tank For Your Truck
- Capacity needs: Decide how many extra miles you require between refills. Higher capacities like 40–69 gallons suit long-distance work or rural routes; smaller tanks suit daily driving with occasional long trips.
- Vehicle compatibility: Verify mounting points, chassis space, and cab-to-bed layouts. Older trucks may need custom brackets or fittings; newer models may accept standard kits more readily.
- Fuel type and system integration: Most auxiliary tanks support gasoline. Check whether your primary system and sending units align with the tank’s connectors and pump setup.
- Delivery method: Evaluate whether the tank uses gravity feed, a pumped supply, or a combination. An electric pump can enable top-to-bottom fueling or siphon-assisted transfer ranges.
- Installation effort: Some options are designed for in-cab or under-bed mounting and come with needed hardware; others require professional installation due to space constraints or fuel line routing.
- Maintenance and durability: Look for corrosion-resistant materials, leak-proof seals, and robust fittings to withstand vibration and temperature changes in truck use.
- Legal and safety considerations: Ensure compliance with local regulations on additional fuel storage, venting, and tank proximity to heat sources or passenger areas.
Frequently Asked Questions
- Q: Can I install an auxiliary tank on any pickup? A: Most pickups can accommodate secondary tanks, but fitment depends on space, mounting points, and fuel system compatibility. Always verify with the tank’s product fitment notes for your exact year and model.
- Q: Will an auxiliary tank affect my truck’s warranty? A: Installation and modifications can impact warranties. Check with the vehicle manufacturer and the tank supplier for guidance on warranty implications.
- Q: Do these tanks require professional installation? A: Some can be installed with basic mechanical skills, while others involve complex routing or electrical work. Review included installation instructions and seek professional help if needed.
- Q: Are there safety concerns with larger tanks? A: Larger tanks add weight and can affect center of gravity. Proper mounting, venting, and fuel line routing reduce risk and improve stability.
- Q: How do I maintain an auxiliary tank? A: Regularly inspect seals, hoses, and fittings for leaks. Ensure venting and the pump (if used) operate correctly, and keep the tank clean to avoid contamination.
- Q: Do these tanks support diesel or other fuels? A: Fuel compatibility varies by model. Confirm whether the tank supports your fuel type and ensure the vehicle’s fuel system is compatible.