Sylvie Willis
Isuzu owners and enthusiasts have been discussing the possibility of adding a second fuel tank to their vehicles. Some have considered replacing the tank with a bigger one, while others have contemplated adding a smaller, auxiliary tank. There are several factors to consider when making this modification, including the weight distribution and the size of the frame. Additionally, the method of linking the two tanks and the placement of the second tank are important considerations. Some have suggested mounting the second tank close to the existing one to avoid increasing the cantilever effect. Others have proposed separate fills for each tank or using a changeover valve to link them.
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What You'll Learn
Mounting the second fuel tank close to the first
When mounting a second fuel tank close to the first, there are several factors to consider. Firstly, it is important to assess the available space and ensure that the second tank does not interfere with body mounts or clutter the frame rails. This includes considering the size and shape of the tank and ensuring it fits within the allotted space without causing any obstructions.
Secondly, the weight distribution of the vehicle will be affected by the addition of the second fuel tank. As the rear frame is typically smaller in dimension than the front, placing a significant amount of weight in the rear can increase leverage and cause the rear frame to oscillate, especially when travelling on rough roads. Therefore, it is crucial to carefully calculate the weight of the second fuel tank and its impact on the overall weight distribution of the vehicle.
Additionally, the cantilever effect should be considered. Mounting the second fuel tank too far back from the first can increase the cantilever effect, which may have negative implications for the vehicle's stability and handling. As such, it is generally recommended to mount the second fuel tank as close to the present one as practical.
In terms of the actual mounting process, it may be necessary to weld or fabricate brackets or supports to securely hold the second fuel tank in place. This process can vary depending on the specific vehicle model and the chosen location for the second fuel tank. Consulting a professional or referring to vehicle-specific instructions can provide more detailed guidance on the mounting process.
Furthermore, when placing the second fuel tank close to the first, consideration must be given to the filling and draining systems. If the tanks are linked via drains, large tubes may be required. Alternatively, separate fills for each tank can be implemented, although this may require additional time and equipment during refuelling.
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The weight of the rear cargo boxes
When considering adding a second fuel tank to an Isuzu box, it is important to take into account the weight of the rear cargo boxes and the potential impact on the vehicle's performance and safety.
It is important to distribute the weight evenly across the axles to ensure the vehicle's stability and handling performance. As mentioned in the forums, placing too much weight at the rear of the vehicle can increase the cantilever effect and cause the rear frame to oscillate, especially when driving on rough roads. This can affect the vehicle's stability and handling, potentially leading to safety hazards.
To optimize weight distribution, consider the dimensions and weight of the cargo boxes themselves. The Isuzu 16 Ft Box Truck, for instance, offers a spacious cargo area with an inside length of 15 feet 8 inches, a width of 6 feet 9 inches, and a height of 9 feet 2 inches. The overall dimensions, including the exterior measurements, allow for easy maneuverability in tight spaces. When planning the placement of the second fuel tank, consider the weight distribution along the length of the vehicle to maintain a balanced load.
Additionally, the type of cargo being transported can impact the weight distribution. For example, concrete blocks or heavy equipment will contribute significantly more weight than lighter cargo. It is crucial to ensure that the total weight, including the cargo boxes and their contents, does not exceed the GVWR and GCWR specifications of the Isuzu model in question.
By considering the weight of the rear cargo boxes, the weight distribution, and the GVWR and GCWR of the specific Isuzu model, you can make informed decisions about adding a second fuel tank while ensuring the vehicle's performance, stability, and safety.
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The road conditions and the impact on the rear frame
When adding a second fuel tank to an Isuzu box, it is important to consider the impact of road conditions on the rear frame of the vehicle. The rear frame of the Isuzu is of smaller dimensions compared to the area ahead of the rear axle, which can affect how much weight can be placed at the back.
The road conditions can impact the rear frame of the Isuzu in several ways. If the roads are rough, the rear frame may experience more oscillation due to the bouncing caused by the uneven surface. This can put additional stress on the frame, especially if the vehicle is loaded with heavy cargo. Therefore, it is recommended to avoid placing a sizable amount of weight at the very back of the vehicle.
Additionally, the placement of the second fuel tank should be carefully considered. Mounting the tank closer to the present one is advisable, as extending too far back can increase the cantilever effect, impacting the stability and safety of the vehicle.
It is also important to ensure that the fuel tank does not compromise the safety standards of the vehicle. The placement of the tank should be such that it is protected from impact in the event of a collision. Placing the tank ahead of the rear wheels, for example, can provide better protection from rear-end collisions.
Furthermore, the weight of the fuel tank itself should be taken into account, especially when combined with other equipment or cargo. While the steel flatbed of the Isuzu is designed to handle significant weight, ensuring that the total load does not exceed the carrying capacity of the individual axles is crucial for safe operation.
In summary, when adding a second fuel tank to an Isuzu box, careful consideration should be given to the road conditions and their impact on the rear frame. This includes managing weight distribution, ensuring safety standards, and minimizing the potential for oscillation and instability.
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The benefits of a bigger fuel tank vs. adding a smaller second tank
There are several factors to consider when deciding between installing a bigger fuel tank or adding a smaller second tank to your Isuzu box. Here are some benefits of each option:
Benefits of a Bigger Fuel Tank:
- Convenience and Reduced Refueling: A larger fuel tank means fewer refueling stops, saving time and the hassle of frequent fill-ups. This is especially advantageous for those who commute long distances or prefer not to stop frequently for gas.
- Fuel Cost Savings: With a bigger fuel tank, you can take advantage of fuel price differences by filling up at locations with lower prices, such as off-interstate stations, without worrying about frequent refueling.
- Safety and Exploration: Carrying more fuel in the tank can be safer than carrying extra fuel on exterior racks, and a larger tank enables longer trips to remote areas without the need for frequent refueling.
- Vehicle Compatibility: Some vehicles may not have the necessary space or configuration for a second fuel tank, making a larger primary tank a more feasible option.
Benefits of Adding a Smaller Second Tank:
- Cost and Weight Considerations: Installing a smaller second tank may be more cost-effective than upgrading to a larger primary tank, and it avoids the potential decrease in fuel economy due to the additional weight of a larger tank and fuel.
- Flexibility and Customization: Adding a second tank can provide the flexibility to choose different fuel types or switch between tanks, depending on your needs. It also allows you to customize your fuel capacity without making permanent modifications to the primary tank.
- Vehicle Performance: For vehicles with poor mileage, a second smaller tank can provide additional fuel capacity without significantly impacting overall vehicle performance or weight distribution.
- Space Optimization: In some cases, adding a second smaller tank may be a better option if installing a bigger primary tank would require sacrificing interior or bed space.
Ultimately, the decision between installing a bigger fuel tank or adding a smaller second tank depends on factors such as driving habits, cost considerations, vehicle specifications, and personal preferences. It is essential to carefully weigh the benefits of each option before making a decision.
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Using a separate fill for the second tank
If you want to install a second fuel tank in your Isuzu box, one option is to use a separate fill for the second tank. This setup can be simpler and more straightforward than linking the two tanks via drains, which would require large tubes.
Using a separate fill involves mounting a second tank close to the existing one and connecting them with hoses. One hose allows fuel to flow between the tanks, while another hose allows air to move in and out, creating a gravity feed system. This setup eliminates the need for a secondary pump or transfer pump.
However, one challenge with this method is finding an accessible spot for the filler of the second tank. You may need to modify the existing fuel door or create a separate filler hose for the second tank. Additionally, consider the legalities of such modifications in your area.
Another option for a dual-tank system is to link the tanks via the fuel filler pipe. This method involves cutting the fuel filler pipe and adding a "tee" that connects to the auxiliary tank inlet. Both tanks will fill simultaneously, and a fuel pump can be added to transfer fuel from the auxiliary tank to the main tank when needed.
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Frequently asked questions
You can either link the two tanks via drains or have a separate fill for the second tank. If you opt for the latter, you will need a changeover valve, a second pump, a separate fuel sender, and sender changeover or individual gauges for each tank.
It is recommended to mount the second tank as close to the present one as possible. This is to avoid increasing the cantilever effect.
You should be careful about how much leverage you are applying to the rear frame, especially if you load the rear cargo boxes. You should also consider the types of roads you will be driving on, as bouncing can cause the rear frame to oscillate.
Some alternatives include replacing the existing tank with a bigger one or adding a 5-gallon jerry can to the rear door.
If you choose to link the two tanks via drains, you will need to use pretty big tubes. This method may also require more time and patience when filling up the tanks.
