
The Ram 3500's fuel tank is designed to contain fuel and facilitate its delivery to the engine. While the tank's capacity varies, some users have noted that it is relatively small, leading them to explore options for upgrading to larger fuel tanks or installing auxiliary tanks. The standard fuel tank in the Ram 3500 is designed to hold 26 gallons of fuel, and some users have expressed interest in increasing this capacity for longer trips. Aftermarket solutions are available, offering auxiliary fuel tanks with capacities ranging from 32 to 100 gallons, depending on the specific model and configuration of the Ram 3500.
| Characteristics | Values |
|---|---|
| Fuel Tank Capacity | 26 gallons |
| Larger Fuel Tank Capacity | 32 gallons |
| Auxiliary Fuel Tank Capacity | 40-100 gallons |
| Fuel Tank Construction Material | Heavy-gauge steel, Metal (steel or aluminum), Plastic (High-Density Polyethylene) |
| Fuel Tank Function | Fuel containment, Fuel delivery to the engine, Housing for essential parts (electric fuel pump, fuel gauge sender) |
| Fuel Tank Protection | Baffles to minimize fuel movement and noise |
| Fuel Tank Evaporative Emission Control | Prevents evaporation of fuel fumes |
| Fuel Tank Maintenance | Not repairable if damaged, Must be replaced, Cleaning due to fuel contamination should be done by professionals |
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What You'll Learn

Ram fuel tank capacity varies across models
The Ram 3500's fuel tank is designed to contain fuel and facilitate its delivery to the engine. Over the years, these fuel tanks have been made from various materials, including steel, aluminium, and high-density polyethylene (HDPE). The capacity of the fuel tank in the Ram 3500 is not specified, but some users have mentioned having a 26-gallon tank, which they consider small and want to replace with a larger option.
The Ram 1500, another model in the Ram truck lineup, is known to have a larger fuel tank capacity. The 2018 Ram 1500 Big Horn, for example, has a 26-gallon fuel tank, which is similar in size to the Ram 3500's. However, some owners of the Ram 1500 have also expressed a desire for a larger fuel tank, indicating that the capacity may vary across different models and years.
The fuel tank capacity of the Ram trucks appears to be a common concern among owners, as there are various aftermarket solutions available to increase fuel capacity. Auxiliary fuel tanks can be installed in the truck bed to extend the overall fuel capacity. Companies like Transfer Flow offer auxiliary fuel tank systems that can hold up to 100 gallons of additional fuel, significantly increasing the driving range.
It's important to note that when considering an auxiliary fuel tank, the dimensions of the truck bed and any additional equipment, such as a fifth wheel, must be taken into account to ensure a proper fit. The width of the auxiliary fuel tank, in particular, can impact the available length, and it's crucial to measure the truck bed accurately to maximize fuel capacity while ensuring a secure fit.
While the standard fuel tank capacity varies across different models and years of Ram trucks, owners have the option to upgrade and customize their fuel capacity through the use of auxiliary fuel tanks. This allows them to find a balance between fuel range and the comfort of their ride.
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Auxiliary fuel tanks can extend the fuel capacity of the Ram 3500
The Ram 3500 has a small fuel tank capacity, with some models having a 26-gallon tank. While it is possible to replace this with a larger tank, such as a 32-gallon option, some owners prefer not to add an auxiliary tank in the bed of their truck. This is where auxiliary fuel tanks come in, providing a way to extend the fuel capacity of the Ram 3500 without modifying the original fuel tank.
Auxiliary fuel tanks are installed in the bed of a truck, and they come in various sizes to fit different truck bed lengths and widths. When choosing an auxiliary fuel tank, it is essential to consider the dimensions of your truck bed to ensure the tank fits securely and does not interfere with other components, such as the wheel wells or a fifth wheel.
There are several companies that offer auxiliary fuel tanks for the Ram 3500. Transfer Flow, Inc. provides a range of options, including a 40-gallon in-bed auxiliary fuel tank system that is compatible with most diesel trucks and fits under over-the-rail toolboxes. They also offer larger tanks, such as their 100-gallon L-shaped refueling tank, which provides a significant amount of additional fuel capacity.
Another company to consider is ATI, which offers a 66-gallon auxiliary fuel tank that can be shipped directly to customers. For those looking for an even larger capacity, Transferflow also offers a 75 to 100-gallon auxiliary tank option. These tanks provide peace of mind on the road by giving drivers extra fuel capacity without the need to stop at fuel stations as frequently.
When installing an auxiliary fuel tank, it is important to consider the mounting hardware and ensure that it is compatible with your truck model. Some companies, such as RDS, offer generic tanks that may require fabricating mounting hardware, while others provide custom-fit options for specific truck models. Overall, auxiliary fuel tanks provide a great solution for Ram 3500 owners looking to extend their fuel capacity and increase their driving range.
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RamBox impacts the space available for fuel tanks
The Ram 3500 is a large truck with a small fuel tank capacity, which can be problematic for owners taking long trips. While the standard tank size is 26 gallons, some owners have sought larger tanks of 32 gallons or more.
One of the key factors that impact the space available for fuel tanks in the Ram 3500 is the presence of a RamBox. The RamBox is a storage system that is integrated into the truck bed, providing lockable, weatherproof, and illuminated storage compartments. These compartments are designed to keep tools and equipment secure and can be a valuable feature for owners who need to transport gear. However, the inclusion of the RamBox reduces the available space in the truck bed, which can limit the size and placement of any auxiliary fuel tanks.
When considering an auxiliary fuel tank for a Ram 3500 with a RamBox, it is crucial to measure the truck bed width accurately. The width of the truck bed will determine the length of the fuel tank that can be accommodated. Ram trucks with short beds typically have a maximum width of up to 16 inches before the wheel wells are reached. This means that auxiliary fuel tanks wider than 16 inches will not fit in a short-bed truck unless they have specific notch features that reduce their overall length.
To maximize fuel capacity, owners of the Ram 3500 with a RamBox can explore auxiliary fuel tanks with notches at the bottom. These notches reduce the length of the fuel tank, allowing it to fit within the available space in the truck bed. Additionally, narrow auxiliary fuel tanks and transfer tanks are designed with minimal width sizes, ensuring they can fit within the dimensions of the truck bed without interfering with other components.
It is worth noting that the inclusion of a fifth wheel in the Ram 3500 can further impact the available space for an auxiliary fuel tank. The presence of a fifth wheel reduces the width available for the fuel tank, and careful measurements are necessary to ensure a proper fit without interference. While the RamBox does impact the space available for fuel tanks, there are customized solutions available to enhance the fuel capacity of the Ram 3500 while considering the unique configuration of the truck bed.
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Factory settings may impact fuel tank capacity
The standard fuel tank capacity of the Ram 3500 is 26 gallons, which some users have criticised as being too small for their needs, particularly during long-distance travel. This has led to discussions about upgrading to larger fuel tanks, such as a 32-gallon option.
It's important to note that modifying the fuel tank capacity of a vehicle like the Ram 3500 can be complex. The size and shape of the fuel tank are influenced by various factors, including the truck's overall design, engine configuration, and available space within the vehicle. Additionally, the fuel tank's capacity must be compatible with the fuel delivery system and engine's fuel requirements.
While some users have considered upgrading, it's essential to consult professionals or experts in the field. Modifying the fuel tank may require careful measurements, especially when considering auxiliary fuel tanks, as improper installation or sizing can lead to interference with other components, such as the wheel well or fifth wheel.
Furthermore, fuel tank capacity can be influenced by factory settings related to emissions control and fuel efficiency. For example, the Ram 3500's fuel tank is designed with baffles to minimise fuel movement and noise, contributing to a more efficient and controlled fuel delivery system. These factory settings may impact the overall capacity of the fuel tank to ensure the vehicle meets certain standards and regulations.
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Ram 3500 fuel efficiency impacts the need for a larger tank
The Ram 3500's fuel efficiency is a key factor in determining the need for a larger fuel tank. While some owners of the Ram 3500 have expressed a desire for a larger fuel tank, citing the inconvenience of frequent refuelling on long trips, the truck's fuel efficiency plays a significant role in balancing this need.
The Ram 3500's fuel efficiency is influenced by various factors, including engine specifications, driving conditions, and load. According to some sources, the Ram 3500 is claimed to achieve 19 miles per gallon (mpg) in the city and 26 mpg on the highway, with a combined average of around 23 mpg. These efficiency figures can be affected by factors such as altitude, temperature, and terrain, which may result in lower mpg figures in real-world driving conditions.
The fuel tank capacity of the Ram 3500 is typically around 26 gallons, as mentioned by owners of the 2018 model year vehicle. With the estimated fuel efficiency figures, a 26-gallon fuel tank would provide a range of approximately 500-700 miles between refills. This range may be impacted by factors such as driving style, terrain, and whether the vehicle is used for towing or hauling heavy loads, all of which can influence fuel consumption.
While a larger fuel tank may seem like a straightforward solution to extending the range of the Ram 3500, it is important to consider the trade-offs. A larger fuel tank would increase the overall weight of the vehicle, which could negatively impact fuel efficiency and handling. Additionally, a larger fuel tank may occupy more space in the vehicle, reducing the available cargo capacity or impacting the overall design and functionality of the truck bed.
To address the range limitations without opting for a larger fuel tank, some Ram 3500 owners have explored the use of auxiliary fuel tanks. These additional tanks can be installed in the truck bed, providing extra fuel capacity without significantly impacting the vehicle's efficiency or cargo space. Auxiliary fuel tanks come in various sizes and configurations, allowing owners to choose the option that best suits their needs while ensuring compliance with legal and safety requirements.
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