When choosing a gravity-fed auxiliary fuel solution for a pickup, reliability, compatibility, and rust resistance matter most. This guide highlights five top gravity-feed fuel tanks designed to fit truck beds, along with practical considerations for installation, safety, and ongoing maintenance. The selections below emphasize corrosion resistance, adequate capacity, and ease of integration with common OE systems.
| Product | Brand | Capacity | Key Benefit |
|---|---|---|---|
| RDS MFG INC Fuel Tank – 60-Gallon | RDS MFG INC | 60 gallons | Top-siphonable, versatile fit |
| RDS MFG INC 72771 Fuel Tank | RDS MFG INC | Unknown (standard) | Locking fill cap; rust-resistant aluminum |
| Landrol 58 Gallon Iron Fuel Cell Tank | Landrol | 58 gallons | Iron construction with rust protection |
| RDS MFG INC Rectangular Auxiliary Fuel Tank – 69 Gallon | RDS MFG INC | 69 gallons | Wide selection for exterior mounting |
| TITAN Fuel Tanks XXL Replacement Diesel Tank | TITAN Fuel Tanks | 55 gallons | Mid-ship design; OE-sending unit compatibility |
The following sections provide concise, objective evaluations of each option, focusing on capacity, durability, and installation considerations to help you compare approaches to gravity-fed fueling for truck beds.
RDS MFG INC Fuel Tank – 60-Gallon
The RDS 60-gallon tank is designed to fit a range of short and standard truck beds, with flexible options that support gravity-fed fueling from the top via an electric pump. It is marketed as part of a broader lineup of tanks in various capacities and dimensions, making it a practical choice for users seeking a mid-size auxiliary solution. A notable feature is its top-siphon capability, which supports controlled fueling without a mid-tank pump.
For installation, measuring the bed and ensuring compatibility with your OE lines matters. The 60-gallon capacity balances range with weight, and the aluminum construction helps reduce corrosion potential. Since RDS emphasizes a broad product assortment, this tank is often paired with matching accessories to simplify mounting and fitment. As with any gravity-fed system, care should be taken to verify the top-fuel pickup remains accessible for pump operation and that venting is properly managed to avoid vapor lock.
RDS MFG INC 72771 Fuel Tank
The 72771 model highlights a locking automotive-style fill cap and exterior mounting intent, with aluminum construction aimed at rust resistance. These attributes contribute to durability in outdoor settings where exposure to weather and road conditions is common. It is useful for truck bed applications where a secure fill is prioritized to deter unauthorized access and to protect the fuel system from contaminants. Consider verifying fit with your bed rails and alignment with the fuel line routing before purchase.
Auxiliary Fuel Tank Install Kit Diesel Installation Kit
This installation kit supports gravity-fed diesel setups and is designed for multiple makes and models, including Ford, Dodge, and Chevy/GMC variants from the late 1990s through the 2020s. It emphasizes corrosion resistance with aluminum and rubber components to prolong service life. The kit aims to provide a stable gravity supply by working with an OE tank and a 1 1/2″ fill line, ensuring consistent flow. Users should confirm compatibility with their specific engine platform and check OEM part numbers prior to ordering.
11025 1 1/2″ Diesel Installation Kit
The 11025 kit is specifically described as compatible with diesel systems and 1 1/2″ fill lines, working with certain Ford, Dodge, Chevy/GMC models from various years. The kit’s emphasis on compatibility with gravity-fed arrangements makes it a practical accessory for users retrofitting or upgrading an existing bed tank. It notes a 3/8-inch female pipe thread drain fitting, which can influence how you route return lines or venting. As with any installation, confirm your engine and bed configuration to ensure a seamless fit.
RDS MFG INC Rectangular Auxiliary Fuel Tank – 69 Gallon
The 69-gallon rectangular option from RDS MFG INC expands capacity for longer hauls or tougher routes. It highlights the same top-siphon fuel pickup approach and a packing emphasis that suits exterior mounting. The product listing mentions a set of dimensions that help with bed clearance calculations, including a long length suitable for applications requiring a broader footprint. This model suits scenarios where maximizing usable capacity without compromising on exterior mounting space is a priority.
RDS MFG INC 71783 Auxiliary Fuel Tank 63Gal Wedge
The 63-gallon wedge tank offers a geometry tailored for certain bed widths and mounting angles, with product specs listing dimensions and country of origin. Wedge designs may help optimize clearance around wheels and underbody features while providing a predictable gravity-fed fuel supply. As with other gravity-fed tanks, ensure the fill cap, venting, and line routing are compatible with your pickup’s bed layout and existing fuel system hardware.
Landrol 58 Gallon Iron Fuel Cell Tank
Landrol’s 58-gallon iron tank emphasizes durability with a corrosion-resistant iron construction and an electroplated finish to combat rust. The larger, rectangular shape aims to provide substantial capacity without excessive bed intrusion. It notes practical dimensions for bed fitment, which helps with installation planning. For heavy-duty applications or frequent exposure to harsh environments, iron tanks can offer robust longevity, though weight considerations and mounting hardware must be planned accordingly.
TITAN Fuel Tanks XXL Replacement Diesel Tank – 55 Gallon
The TITAN XXL 55-gallon tank is designed for Ford F-250/F-350 Crew Cab with a short bed, featuring a mid-ship design that minimizes interference with steps and airbags. This model is described as using the stock OE sending unit, preserving existing gauge readings and pump compatibility. The 55-gallon capacity provides a practical balance between range and integration with the truck’s factory systems, making it a suitable option for owners who need a straightforward replacement that maintains OEM compatibility.
Buying Guide: Key Factors for Gravity-Feed Tank Purchases
- Capacity and weight: Higher gallons increase range but add weight and may affect bed clearance.
- Material and corrosion resistance: Aluminum and iron variants offer different durability profiles; consider climate and road salt exposure.
- Mounting compatibility: Measure bed width, rail configuration, and tailgate clearance to ensure a proper fit.
- Fuel type and compatibility: Confirm diesel vs gasoline compatibility and alignment with the engine feed line and return setup.
- Fill and vent design: A locking cap or secure fill reduces contamination risk; proper venting prevents vapor lock.
- OE integration: Tanks that align with OE sending units simplify gauges and fuel monitoring.
- Installation considerations: Some kits provide easier mounting, line routing, and secure fasteners; assess whether professional installation is advisable.
- Maintenance and serviceability: Look for tanks with accessible top pickups and clear drainage options for cleaning.
When evaluating gravity-fed fuel tanks for a truck bed, prioritize compatibility with your make, model, and year. Assess not only capacity but also how the tank will integrate with existing fuel lines, the vehicle’s electrical system for any electric pump, and venting needs to reduce vapor lock and spills. This approach helps ensure safe, reliable fueling across long hauls or routine use.