Diesel vehicle owners and fleet operators increasingly rely on reliable auxiliary fuel tanks to extend range and reduce downtime. This guide highlights five well-regarded options, focusing on capacity, durability, and compatibility with common diesel installations. Each product section offers key features and practical considerations to help you compare setups for gravity-fed systems, top-fill designs, and corrosion-resistant materials.
| Product | Brand | Capacity | Best For |
|---|---|---|---|
| Rectangular Auxiliary Fuel Tank – 45 Gallon | RDS MFG INC | 45 gal | Compact auxiliary fueling with top-siphon capability |
| Rectangular Auxiliary Fuel Tank – 69 Gallon | RDS MFG INC | 69 gal | Higher-capacity diesel supplementation |
| Landrol 58 Gallon Aluminum Fuel Cell Tank | Landrol | 58 gal | Heavy-duty aluminum transfer tank |
| RDS Aluminum Auxiliary Transfer Fuel Tank – 200 Gallon | RDS MFG INC | 200 gal | Large-volume diesel storage |
| RDS MFG INC 71783 Auxiliary Fuel Tank 63Gal Wedge | RDS MFG INC | 63 gal | Wedge shape for space-constrained mounts |
Below are the five selected products, organized to help you compare material type, capacity, and installation considerations across common diesel applications.
RDS MFG INC Rectangular Auxiliary / 45 Gallon Tank
The 45-gallon rectangular tank from RDS MFG INC is designed for flexible diesel storage and transfer. It features a fully welded construction for durability and is suitable for top-filling and siphoning with an electric pump. The manufacturer notes a broad assortment of compatible tank sizes, enabling operators to choose a fit that aligns with available mounting space and vehicle chassis. Gasoline compatibility is mentioned, but verify your system’s fuel regulations before cross-fueling. This model is ideal for compact fleets or installations where space is at a premium and a moderate capacity is sufficient.
RDS MFG INC Rectangular Auxiliary Fuel Tank – 69 Gallon
The 69-gallon rectangular tank expands the diesel storage capacity while preserving a similar form factor to smaller models. It shares RDS MFG INC’s emphasis on full welded seams for durability and provides a larger top-siphon and pump-ready setup. The package dimensions are substantial enough to note clearances for mounting and routing fuel lines. For operators needing extra range without jumping to a full 100+ gallon system, this intermediate size offers a practical balance between capacity and fit.
Landrol 58 Gallon Aluminum Fuel Cell Tank
Landrol’s 58-gallon aluminum fuel cell is a robust option for those prioritizing lightweight construction and corrosion resistance. The aluminum composition helps reduce overall vehicle weight, improving efficiency, and easing handling during installation. The dimensions indicate a long, low-profile footprint suitable for under-vehicle mounting with ample clearance for hoses and fittings. The product notes emphasize its suitability for transportation applications, making it a sensible choice for fleets that require a high-duty auxiliary tank without overly increasing weight.
RDS Aluminum Auxiliary Transfer Tank – 200 Gallon
The 200-gallon aluminum auxiliary transfer tank is built for substantial diesel storage, featuring a baffled design to minimize sloshing and a sight gauge for quick level checks. A 6-inch inspection clean-out port supports maintenance and inspection routines, which is advantageous for fleet operators running continuous-use systems. Aluminum construction provides longevity in challenging environments and helps offset mass in large-volume applications. This model suits operators needing extended range for long-haul or remote service routes.
RDS MFG INC 71783 Auxiliary Fuel Tank 63Gal Wedge
The 63-gallon wedge-shaped auxiliary tank from RDS MFG INC is designed to optimize mounting space in tight compartments, leveraging a wedge silhouette to maximize usable capacity where height or width constraints exist. Product details highlight general dimensions and country of origin, underscoring build quality and compatibility with common mounting schemes. Operators with limited space may appreciate the geometry that preserves a compact footprint while delivering meaningful diesel capacity.
Buying Guide: Key Purchase Considerations
Selecting an auxiliary diesel tank requires balancing capacity, weight, mounting options, and the operating environment. Consider these dimensions to ensure you choose a model that fits your vehicle and usage patterns:
- Capacity and space: Evaluate required range and available mounting area. Larger tanks offer more fuel but add weight and may require reinforced brackets or frame clearance checks.
- Material and weight: Aluminum tanks are lighter and corrosion-resistant, whereas steel or composite tanks can offer rugged durability but add weight. Consider vehicle load limits and fuel transport regulations.
- Installation kit compatibility: Installation kits or fill lines should match your vehicle’s makes and models. Confirm nozzle sizes, thread fittings, and drain configurations before purchasing.
- Fittings, baffles, and sight gauges: Baffled designs reduce slosh during movement, sight gauges speed fuel level checks, and clean-outs simplify service.
- Fill and drain orientation: Gravity-fed systems simplify plumbing but require precise routing. Electric pumps enable easier transfer but need power considerations and safety measures.
- Regulatory compliance: Check local requirements for auxiliary tanks in your region, including permitted fuel types and transfer methods.
- Compatibility with existing diesel systems: Ensure the kit and tank are compatible with your engine type (diesel) and do not interfere with OEM components.
Understanding Different Install Scenarios
For fleet operators, the choice often hinges on the trade-off between capacity and installation complexity. Mid-range tanks (45–69 gallons) suit daily trucking routes with moderate refueling intervals, while larger tanks (100+ gallons) are advantageous for long hauls or remote service. The material choice shifts the balance between weight and durability. Aluminum tanks perform well where weight reduction is important, but steel tanks may offer lower material costs and proven ruggedness in certain climates. Each kit’s installation notes should be consulted to verify fitment with your truck model and axle configuration, and to confirm that any required certifications are met.