
The fuel tank capacity of a vehicle is an important consideration for any owner, and the 2008 F350 has a range of fuel tank options. The standard fuel tank capacity of the 2008 F350 is 30.5 gallons with a 141.8 or 156.2 wheelbase, or 38.0 gallons with a 137, 158, or 172.4 wheelbase. However, there are also a variety of aftermarket fuel tank options available for the 2008 F350, such as the 6.4L SuperCrew Titan Tanks Super Series 67-gallon fuel tank and the Diesel Titan Tanks 30-gallon spare tire fuel tank. In this paragraph, we will explore the fuel tank capacity of the 2008 F350 diesel and discuss the different options available to owners looking to modify their vehicle's fuel tank capacity.
| Characteristics | Values |
|---|---|
| Fuel Tank Capacity | 30.5 gallons with 141.8, 156.2 wheelbase |
| 38.0 gallons with 137, 158 and 172.4 wheelbase | |
| 38 gallons (as per the manual) | |
| 34 gallons (as per user experience) | |
| 37 gallons (as per user experience) | |
| 35 gallons (as per user experience) | |
| 32 gallons (as per user experience) |
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What You'll Learn

The F350 4X4 has a 32-gallon tank
Additionally, the 32-gallon tank offers a greater range, providing peace of mind and flexibility to drivers. This is particularly useful when travelling in remote areas or regions with limited access to fuel stations. The increased range also reduces the likelihood of running out of fuel unexpectedly, enhancing the vehicle's reliability.
In terms of efficiency, the F350 4X4's fuel tank capacity contributes to a more economical fuel consumption rate. While the larger tank may result in slightly heavier fuel loads, the vehicle can optimise fuel usage over longer distances, potentially improving overall fuel economy.
It is worth noting that some F350 models may have different fuel tank capacities. For example, certain F350 variants are equipped with a 38-gallon fuel tank, as indicated in the owner's manual. However, some users have reported discrepancies, noting that the warning system indicates empty or low fuel levels even when there may be some fuel remaining in the tank.
Therefore, while the F350 4X4 is typically equipped with a 32-gallon tank, it is always advisable to refer to the specific model's specifications and owner's manual for the most accurate information regarding fuel tank capacity and fuel management guidelines.
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The 38-gallon manual claim
According to the manual, the fuel tank capacity of a 2008 F350 diesel truck is 38 gallons. However, some users have reported discrepancies between the manual's claim and their actual experience. One user with an 08 350 CC long box SRW truck stated that despite the manual's indication of a 38-gallon fuel tank, they had never filled more than 34 gallons of fuel, even when the warning system indicated less than 10 miles until empty. This discrepancy has sparked discussions among users, with some speculating that the Distance-to-Empty (DTE) calculation may not be entirely accurate.
It is important to note that fuel tank capacity can vary depending on the specific model and configuration of the F350. For example, the fuel capacity is specified as 38.0 gallons for certain wheelbase configurations (137, 158, and 172.4) of the 2008 Ford Super Duty F350, as listed in a technical specifications document. This aligns with the manual's claim of a 38-gallon fuel tank for the 2008 F350 diesel truck.
However, another user with an F350 longbed SRW shared a similar experience to the first user, mentioning that they initially believed their truck had a 32-gallon tank but later discovered it could accommodate "some extra juice." This user's experience suggests that the actual fuel tank capacity may be slightly higher than what was previously assumed, but they did not specifically mention the year of their truck or if it was the same model as the one in the manual with the 38-gallon claim.
While the manual and specifications indicate a 38-gallon fuel tank capacity for certain models of the 2008 F350 diesel, the varying experiences of users highlight the possibility of discrepancies between the official claims and real-world usage. These discrepancies could be due to a variety of factors, including the unique characteristics of individual vehicles, the accuracy of fuel gauges, or the behaviour of the fuel warning systems. As a result, some users express a preference for more conservative fuel management practices to avoid running their vehicles too close to empty.
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30.5 gallons with 141.8, 156.2 wheelbase
The fuel capacity of a 2008 F350 diesel truck depends on the vehicle's wheelbase. For a wheelbase of 141.8 or 156.2, the fuel tank capacity is 30.5 gallons. However, for longer wheelbases of 137, 158, or 172.4, the fuel capacity increases to 38.0 gallons.
The wheelbase of a vehicle refers to the distance between its front and rear wheels. It is an essential factor in determining a car's handling characteristics and overall performance. A longer wheelbase generally provides a smoother ride and improved stability, especially when towing or carrying heavy loads.
In the context of the 2008 F350, the wheelbase options cater to different use cases and requirements. The shorter wheelbase of 141.8 or 156.2 is more maneuverable and may be preferred for applications where space is limited or agility is a priority. On the other hand, the longer wheelbase variants offer increased fuel capacity, which can be advantageous for extended trips or applications where refueling may not be convenient or easily accessible.
It is worth noting that while the fuel tank capacity is an important consideration, other factors also influence the vehicle's efficiency and range. These factors include engine performance, driving conditions, terrain, and the weight of any loads being carried. By taking these factors into account, owners and operators can make informed decisions about their refueling strategies and overall trip planning.
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6.4L SuperCrew Titan Tanks
The fuel tank capacity of a 2008 F350 diesel truck is 38 gallons, according to the manual. However, some users have reported discrepancies, claiming that they have never put more than 34 gallons of fuel in the tank when the warning system indicates that the truck is close to empty.
Now, if you're looking to upgrade your fuel tank capacity, Titan Tanks offer a range of options for the 2008 F250 and F350 6.4L SuperCrew models:
This fuel tank offers a significant upgrade in capacity, allowing you to go further and extend the time between fill-ups. It is designed to fit the 2008-2010 F250 and F350 6.4L SuperCrew models. With a price tag of $1,538.05, it ships within 5-7 business days from the manufacturer.
For those seeking even greater fuel capacity, the Titan Tanks Super Series 67-gallon fuel tank is designed for the 2008-2010 F250 and F350 6.4L SuperCrew Long Bed models. This option provides an incredible amount of fuel capacity, allowing for even longer journeys without the need to refuel. Priced at $2,003.55, it ships directly from the manufacturer.
Titan Tanks are renowned for their heavy-duty construction and perfect fit, ensuring unparalleled freedom and convenience on the road. Their fuel tanks are crafted from military-grade XLHDPE cross-linked polymer, providing strength and rigidity. Additionally, their innovative low fuel trap design ensures that nearly every gallon of fuel you put in can be used efficiently.
By upgrading to a Titan Tank, you'll transform your driving experience, especially when towing heavy loads or embarking on cross-country adventures. You'll have the confidence and peace of mind to go the distance, making your 2008 F350 diesel truck even more capable and versatile.
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Diesel Titan Tanks 30-gallon spare
The fuel tank capacity of a 2008 F350 diesel truck is 38 gallons according to the manual. However, some users have reported discrepancies, claiming that they have never put more than 34 gallons of fuel in the tank despite the warning system indicating that the tank was almost empty.
If you're looking to increase the fuel capacity of your F350 diesel truck, one option to consider is the Titan Fuel Tanks Spare Tire Auxiliary Fuel System (STAFS). This innovative system offers a 30-gallon spare fuel tank, effectively doubling the fuel capacity of American-made diesel pickup trucks manufactured after 1999. Here's a detailed overview of the Diesel Titan Tanks 30-gallon spare option:
The Diesel Titan Tanks 30-gallon spare is a convenient and efficient solution for extending your F350's fuel capacity. This auxiliary fuel system is designed to fit F250, F350, and F450 HD FORD pickup models with Power Stroke engines for the model years 1999-2007. It is worth noting that this system is intended for vehicles equipped with heavy-duty Class V hitches, which are standard on most full-sized diesel pickups.
The 30-gallon tank is crafted from military-grade cross-linked polyethylene, making it durable yet lightweight at only 30 pounds. This lightweight construction allows for easy installation and handling by a single person. The tank is installed in the underbody location, ensuring that it does not compromise the truck bed's hauling space.
The STAFS system includes a universal filler kit with an attractive brushed aluminium door that can be installed on the vehicle's exterior sidewall or inside the truck bed. Additionally, it comes with all the necessary mounting hardware, hoses, valves, and a pump. The fuel transfer process is straightforward, with a single-touch button that initiates the transfer of fuel from the STAFS tank to the primary fuel tank. The illuminated user interface on the controller displays the tank's fuel level, providing a user-friendly experience.
With the Diesel Titan Tanks 30-gallon spare, you can have peace of mind knowing that you have extra fuel at your fingertips, making it an ideal solution for long-distance travel or remote work sites.
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Frequently asked questions
The fuel tank capacity of a 2008 F350 diesel truck is listed as 38 gallons in the manual. However, some owners have reported only being able to fill the tank with 34-35 gallons of fuel.
According to a forum post, a user with an F350 4X4, DRW Long-bed 6.4 litre model reported achieving between 8.5 and 9.6 mpg while pulling a 34-foot trailer.
Yes, there are aftermarket fuel tanks available that offer larger capacities. For example, Stage 3 Motorsports offers a 67-gallon fuel tank for the 2008 F350 6.4L SuperCrew model, as well as a 40-gallon auxiliary fuel system.











































