Ameer Randolph
Piping dual fuel tanks involves connecting two fuel tanks together to create a single fuel supply with a larger capacity. This setup is commonly used in vehicles and residential heating systems to increase fuel efficiency and extend the range. While it offers several advantages, it also presents challenges, such as ensuring fuel equilibrium between the tanks and preventing leaks, which could lead to hazardous situations. To overcome these issues, various methods and components, such as Y connectors, dual circuit ball valves, and marine valves, have been suggested by experts in the field.
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What You'll Learn
Using a Y connector to join supply lines
Using a Y-connector to join supply lines is a possible method of plumbing dual fuel tanks. This method allows for equilibrium between both tanks, ensuring that the fuel level on both sides remains the same. To achieve this, the supply lines from both tanks are joined with a Y connector, as are the return lines, and the vent lines are connected between the two tanks.
When employing this plumbing design, it is important to consider the positioning of the tanks and the direction of the filler and vent lines. The filler and vent lines to the auxiliary tank should flow downhill to prevent issues. Additionally, the vent should be the highest point in the system.
It is also worth noting that some users have expressed concerns about potential leaks with this system, especially when using gravity feed systems. To address this, it is recommended to have a manual shut-off mechanism in place to control the fuel transfer and minimise the risk of leaks.
Furthermore, when joining the supply lines with a Y connector, it is crucial to ensure that the tanks are at the same level to maintain the desired equilibrium in fuel levels. This setup may require careful planning and consideration of local regulations, as inspectors might have specific requirements for dual fuel tank installations. Consulting with a professional plumbing contractor or fuel supplier is advisable to fine-tune the details of the installation.
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Installing a Blazer or Suburban tank
There are a few considerations when installing a Blazer or Suburban tank. Firstly, the filler neck position should be considered. The Blazer tank has the filler on the passenger side, while some users prefer to have the filler on the left side. This can be achieved by turning the tank around, using the fuel door and surrounding metal from the donor truck to finish the outside.
Another consideration is how to connect the tanks. One method is to use a transfer pump and a momentary switch to keep the tanks separate. Alternatively, some users suggest installing a dual-circuit ball valve to switch both the supply and return at the same time. However, this method may lead to cross-feeding on hills, where fuel from one tank drains into the lower tank and causes an overflow.
It is also important to consider the weight of the fuel when installing larger tanks. Adding 40 gallons of fuel can increase the weight by approximately 360 pounds, which can affect the performance and fuel efficiency of the vehicle. Additionally, ensuring that the filler and vent of the auxiliary tank flow downhill is crucial to avoid issues.
Overall, installing a Blazer or Suburban tank can provide benefits in terms of increased fuel capacity and range. However, careful consideration should be given to the filler neck position, connection method, and weight of the additional fuel to ensure a successful installation.
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Using a dual circuit ball valve
When plumbing dual fuel tanks, one recommended method is to use a dual circuit ball valve. This allows both the supply and return of fuel to be switched at the same time, ensuring that the fuel levels in both tanks remain the same. This can be achieved by joining the supply lines from both tanks with a Y connector, as well as the return lines, while connecting the vent lines between the two tanks.
One example of a suitable valve is the Groco FV-6-5038 bronze 6-port marine valve, which can be mounted under the cab with the lever accessible through a rubber grommet in the cab floor. This setup provides easy access to the lever and also acts as passive anti-theft due to its hidden location.
When using a dual circuit ball valve, it is important to consider the potential for cross-feeding, especially when driving on hills. This can be mitigated by employing a transfer pump and a momentary switch, or by using an auxiliary tank with a gravity feed into the filler on the main tank.
Additionally, when plumbing dual fuel tanks, it is crucial to address potential fuel leaks. This can be done by incorporating internal ties within the tanks, which can help with self-priming and eliminate the need for holes in the bottom of the tanks. Regularly checking for the smell of fuel or visible leaks is also important to ensure the system is functioning safely.
Overall, using a dual circuit ball valve to pipe dual fuel tanks offers a balanced fuel supply and return system, maintaining equilibrium between the tanks. Proper mounting, consideration of cross-feeding, and attention to potential leaks are key factors in successfully implementing this method.
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Using a manual dual port valve
When plumbing dual fuel tanks, one option is to use a manual dual port valve to switch between the two tanks. This setup allows you to manually select which tank is currently in use.
One such valve is the Groco FV-6-5038 bronze 6-port marine valve, which can be used to switch the return lines. This valve can be mounted under the cab with the lever passing through a rubber grommet in the cab floor. This setup provides easy access to the lever and also allows for an off position, which can act as a passive anti-theft measure.
Another option for a manual dual port valve is the Anderson SK1036 6-port brass valve. This valve can be used to manually switch between two fuel tanks, allowing you to draw fuel from one tank at a time.
When using a manual dual port valve, it is important to consider the location of the valve for easy access and to ensure that the return lines are properly configured to direct fuel back to the correct tank.
Additionally, when dealing with dual fuel tanks, it is worth considering other options such as using a dual circuit ball valve or a transfer pump with a momentary switch to manage fuel transfer between the tanks.
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Connecting two tanks with a pipe
Planning the Tank Connection:
Before connecting two tanks, it is essential to consider the purpose of the connection and the type of tanks being used. For example, connecting water storage tanks to increase water volume or distribution systems may have different requirements than connecting dual fuel tanks in a vehicle. It is also important to consider the distance between the tanks and any obstacles that may impact the piping setup. Creating a sketch or diagram can help determine the feasibility of the connection and the amount of plumbing needed.
Choosing the Right Pipe and Fittings:
The type of pipe and fittings used will depend on the specific application. For water storage tanks, ANSI/NSF 61 and ANSI/NSF 14 certified PVC pipes are commonly recommended. For fuel tanks, the type of pipe may depend on the fuel type and local regulations to prevent leaks and fires. The size of the tank outlets should also be considered, as smaller outlets may require larger diameter pipes to reduce the risk of blockage from sediment or debris buildup.
Connecting Tanks at the Top or Bottom:
Tanks can be connected at the top or bottom, each with its own advantages. Connecting tanks at the top, known as linking from the overflow, allows the first tank to fill before overflowing into the next. This method can be simpler in terms of pipework, as it typically requires only one overflow cut. However, it may result in uneven filling of the tanks. Connecting tanks at the bottom allows all tanks to fill evenly once a minimum water level is reached. This method can be more complicated but provides better control over the filling process.
Using Valves and Fittings:
Isolation valves are important when connecting tanks, especially at the top. These valves help control the release of water or fuel and prevent a single tank leak from draining all connected tanks. In some cases, additional fittings or adapters may be required to connect the tanks. For example, when connecting water tanks, the tank outlets may need to be modified or removed to accommodate PVC plumbing.
Connecting Tanks without Drilling:
In some cases, it is possible to connect two tanks without drilling them. This can be achieved by using a U-shaped PVC pipe that is filled with water, allowing for the free movement of water or other substances between the tanks. This method is often used in aquariums to connect tanks for fish without the need for electricity.
Considerations for Dual Fuel Tanks:
When connecting dual fuel tanks, it is essential to consider the fuel gauge, valving, and switching between the tanks. Using a Y connector to join the supply and return lines can help maintain equilibrium between the tanks, keeping the fuel level the same on both sides. Additionally, a dual circuit ball valve or a manual dual-port valve can be used to switch between the tanks.
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Frequently asked questions
You can plumb the two tanks together for a single large fuel supply. The supply lines from both tanks can be joined with a Y-connector, as can the return lines, and the vent lines can be connected between the tanks. This design allows for equilibrium between the tanks, so the fuel level stays the same.
It is important to consider the placement of the tanks and pipes to avoid leaks and ground contamination. For example, it is better to encase the oil feed in a separate pipe on top of the concrete rather than running it under the floor.
You will need a dual-circuit ball valve or a manual dual-port valve to switch between the two tanks. You may also need a transfer pump and momentary switch.
