If you need a 90-gallon auxiliary fuel tank, choose reliability, safety, and compatibility with your setup. This guide highlights five solid options from RDS MFG INC that suit rugged work vehicles, tow rigs, and service fleets. Best for: heavy-duty on-site use, off-road or remote work, and users needing straightforward transfer capabilities. The following table summarizes each pick to help you compare at a glance.
| Product | Capacity | Best For |
|---|---|---|
| RDS MFG INC 71791 Rectangular Transfer Liquid Tank | ~91 Gallon | General transfer and auxiliary fueling where top-siphon access is available |
| RDS MFG INC 72118 Vertical Transfer Fuel Tank | 90 Gallon | Rust-resistant aluminum tank for long-term outdoor use |
| RDS MFG INC RDS Fuel Transfer/Auxiliary Tank/Toolbox Combo with 15 Gpm Pump | 90 Gallon | All-in-one solution with pump for quick fueling and toolbox convenience |
| RDS MFG INC RDS 71788 Rectangular Auxiliary/Transfer Combo Fuel Tank | 90 Gallon | Rectangular configuration with separate toolbox/gear area |
| Rds 72745Pc – Combo Auxiliary Fuel Tank With Fuel Filler Shroud | 60 Gallon | Compact option with filler shroud for cleaner fueling (not 90 gal) |
RDS MFG INC 71791 Rectangular Transfer Liquid Tank
Capacity is listed around 91 gallons. Features note: top-siphon fueling with an electric pump is possible; includes only the tank itself (no pickup tube, pump, hose, or nozzle). Best for buyers who already own transfer hardware and need a rectangular tank with flexible mounting. Caution: verify your pump compatibility and mounting space before purchasing.
RDS MFG INC 72118 Vertical Transfer Fuel Tank
90-gallon vertical tank with a 60″ length, 14″ width, and 26″ height. Rust-resistant aluminum construction enhances durability in outdoor settings. Best for vehicles with limited horizontal space where a vertical profile is preferable. Limitation: does not include pump, hose, or pickup tube—these must be sourced separately.
RDS MFG INC RDS Fuel Transfer/Auxiliary Tank/Toolbox Combo
This 90-gallon combo includes a 15 GPM pump and a toolbox, offering an integrated solution for quick fueling and tool storage. Best for fleets or work trucks requiring ready-to-use pump capability and on-hand tools. Limitation: this option combines fuel equipment with storage; ensure sufficient mounting space and weight distribution to avoid overloading the vehicle.
RDS MFG INC 71788 Rectangular Auxiliary/Transfer Combo Tank
90-gallon rectangular tank combined with a toolbox space. Tank dimensions: 57 inches long by 30 inches wide by 12.75 inches high. The combo design is suitable for installations where tool access alongside fuel storage is beneficial. Best for users needing a compact footprint with built-in tool storage. Caution: confirm mounting clearance for the toolbox portion in your vehicle or trailer.
Rds 72745Pc – Combo Auxiliary Fuel Tank With Fuel Filler Shroud
Package includes a compact combo with a fuel filler shroud. Capacity is around 60 gallons, not a 90-gallon option, but it remains relevant for users requiring a smaller auxiliary tank with enhanced fueling aesthetics and reduced splash risk. Best for lighter-duty use or as a secondary backup unit if space is limited. Limitation: not a 90-gallon solution.
Buying Guide
What capacity should you choose?
For standard auxiliary fueling needs on larger work trucks or trailers, 90 gallons is a common compromise between range and vehicle weight. If space is very limited, a 60–60+ gallon option may fit better but will reduce range. Always consider vehicle payload, mounting space, and regulatory restrictions for fuel storage on your equipment.
What material should you prefer?
Aluminum tanks offer corrosion resistance and lighter weight, suitable for outdoor environments. Steel tanks are generally tougher but may require more maintenance to prevent rust. If you frequently store ethanol-containing fuels, select materials designed to resist ethanol compatibility.
Do you need a pump or toolbox?
Some models ship with a pump and toolbox, delivering a turnkey fueling and storage solution. If you already own a pump system, a tank-only option may save cost and allow you to choose compatible components. Consider maintenance access, pump placement, and wiring when selecting a combo kit.
How important is mounting space and layout?
Rectangular shapes often fit tighter spaces along vehicle sides or underbeds, while vertical designs save floor space but may require taller mounting locations. Validate dimensions (length, width, height) against your mounting area and ensure there is room for hoses, fittings, and access to the pump if included.
Safety and compliance
Ensure that fuel tanks and accessories comply with local regulations and that installation follows best practices for venting, grounding, and secure mounting. Always use appropriate hardware and sealants to prevent leaks and spills during transport and fueling.
FAQ
- What is the typical capacity of a 90-gallon auxiliary tank? Most 90-gallon tanks range from about 90 to 95 gallons, depending on the exact model and configuration.
- Can I install a 90-gallon tank on a standard pickup? Yes, with proper mounting brackets and space, but verify payload limits and clearance to avoid interference with doors or wheels.
- Do these tanks come with pumps? Some models include a pump; others require you to source a pump separately. Check product features for specifics.
- Is aluminum better than steel for these tanks? Aluminum offers corrosion resistance and lighter weight, which helps with fuel economy and mounting, while steel can be tougher but heavier and prone to rust without treatment.
- What should I consider when choosing between a tank-only and a combo kit? Tank-only offers flexibility to pair with your existing pump and toolbox; combo kits provide an all-in-one solution but may constrain component choices.
- Are these tanks suitable for all types of fuel? Most are designed for gasoline or diesel use, but always confirm fuel compatibility and ethanol tolerance for your specific application.