Ameer Randolph
Filling dual fuel tanks can be a tricky process. The procedure depends on the vehicle and the design of the stock filler line. In some vehicles, the main tank fills first, and once full, the fuel flows into the auxiliary tank. In others, there are separate fillers for each tank, and they need to be filled separately. Some vehicles have a transfer pump and a switch to control the flow of fuel between the tanks. The fuel gauge may also not read accurately when transferring fuel between tanks while driving. It is important to pay attention when filling to avoid overfilling.
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What You'll Learn
Filling up both tanks can be inconvenient
Another inconvenience is that the fuel gauges on vehicles with dual fuel tanks may not always accurately reflect the actual fuel level in each tank. This is because the fuel may siphon from one tank to another, resulting in one tank being fuller than the gauge indicates. In some cases, the fuel gauge may only show the level of the tank with the fuel gauge, and not the other tank. This can make it difficult to keep track of your fuel levels and plan refuelling stops accurately.
Furthermore, some dual fuel tank systems may require the use of additional equipment such as transfer pumps, momentary switches, or dual circuit ball valves to facilitate the refuelling process and maintain equilibrium between the two tanks. This adds complexity and cost to the system, and there may be legalities to consider when making modifications to the fuel system. Additionally, there is a potential snag point when going through rough terrain if a tube is added between the two tanks to maintain equal fuel levels.
Overall, while dual fuel tanks can provide benefits in terms of increased fuel capacity and range, they can also come with inconveniences and complexities that users should be aware of. These include the need to fill up both tanks separately, potential inaccuracies in fuel gauges, and the requirement for additional equipment to maintain proper fuel flow and equilibrium between the tanks. It is important for users to carefully consider these factors when deciding whether to install or use a dual fuel tank system.
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Tanks will not equalise if only one is filled
Filling up dual fuel tanks can be a tricky process. If you only fill one tank, the tanks will not equalise. This is because the fuel will not flow between the two tanks unless they are at the same level. To ensure your dual fuel tanks equalise, make sure to fill both tanks to the same level. This will ensure that the fuel can flow freely between the two tanks and that your vehicle runs efficiently.
It is important to note that even if the tanks are filled to the same level initially, they may not stay that way. This is because fuel tanks are not perfectly sealed, and fuel can evaporate at different rates depending on various factors such as temperature and atmospheric pressure. Therefore, it is essential to periodically check the fuel levels in both tanks and top them up as necessary to ensure they remain equalised.
There are a few other things to keep in mind when filling dual fuel tanks. First, it is important to use a fuel treatment or additive to help prevent the growth of contaminants. This is especially important if you are storing your vehicle for an extended period. Additionally, always carefully check the seal on the fuel filler cap and replace it if necessary. A faulty seal can lead to contamination, which can cause significant problems.
Finally, it is a good idea to periodically pump out and clean your fuel tanks, especially if you notice any signs of interior corrosion or debris. This will help ensure that your fuel system remains in good condition and that your vehicle runs efficiently. By following these tips, you can help ensure that your dual fuel tanks equalise properly and that your vehicle runs smoothly.
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Use a dual circuit ball valve to switch between tanks
If you have dual fuel tanks, you can use a dual circuit ball valve to switch between them. This is a good way of keeping the tanks separate and ensuring that both the supply and return are switched at the same time.
You can purchase a dual tank switching valve selector, which will allow you to run two separate fuel tanks and draw fuel from only one tank at a time. You would run one fuel line from each tank to the valve and a line from the valve to your engine. You can use a common toggle or rocker switch to operate the valve.
You can also add a manual dual port valve to switch between the two tanks. This can be mounted under the cab with the lever through a rubber grommet in the cab floor, or between the driver's seat and the door.
A dual circuit ball valve can be used in conjunction with a Blazer or Suburban tank, which can be installed in the rear of the vehicle.
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Tanks can be plumbed together for a single large fuel supply
Tanks can be plumbed together to create a single large fuel supply. This can be done by joining the supply lines from both tanks with a Y connector, as well as the return lines, and connecting the vent lines between the two tanks. This setup will allow the fuel level on both sides to stay the same, and the dash gauge will still indicate the same fuel level in the OEM tank—it will just be indicating the level of the combined fuel amount instead of just one tank.
One potential problem with this setup is that during refuelling, you will need to add fuel to both tanks. If you only fill one tank, the fuel will not go up the draw tube and back down into the other tank, and you could run out of fuel in one tank. To avoid this, you can add a tube between the two tanks at the lowest level, which will maintain an equal amount of fuel in both tanks. However, this setup may cause issues when going through rough terrain.
Another option is to use a transfer pump and momentary switch to keep the tanks separate. This setup will allow you to switch between the two tanks as needed. You can also install a manual dual-port valve to switch between the two tanks, which will also switch the return lines.
It is important to consider the potential challenges and safety hazards when plumbing dual fuel tanks together, and to consult with a professional if you are unsure about the best course of action.
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A transfer pump can be used to fill the main tank
When using a transfer pump, it is important to take safety precautions. This includes wearing protective gear such as safety goggles and gloves, as well as ensuring that the work area is free of children, animals, and open flames. It is also important to use the correct type of pump for the specific fluid being transferred, as some pumps are only compatible with certain fluids. For example, oil transfer pumps are typically only suitable for oil, and a separate transmission fluid transfer pump would be needed for transmission fluid.
Before using a transfer pump, it is necessary to prepare the work area and gather the required tools. This includes a drain pan to catch any spills, shop rags or towels, and a sufficient amount of the fluid being transferred. It is also important to ensure that the pump hoses are compatible with the vehicle and properly connected to the pump. The manufacturer's instructions should be followed for the specific vehicle and pump being used.
Transfer pumps work by creating a vacuum that sucks fluid from one tank and deposits it into another. The pump should be primed before use, and the fluid should be allowed to flow from the "IN" to the "OUT" end of the hose. The transfer pump can then be used to fill the main tank of the dual-fuel tank setup.
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Frequently asked questions
The process for filling dual fuel tanks depends on the vehicle. Some vehicles have a transfer pump and momentary switch to fill both tanks. Others have a dual filler neck, allowing you to fill both tanks simultaneously. In some cases, you may need to fill up one tank, then turn the truck around to fill the other.
It is recommended to fill both tanks to maintain an equal amount of fuel in each. However, if your tanks are connected with a transfer pump, you may only need to fill one.
It is not recommended to fill dual tanks via a split main filler as it is hard to control how much fuel goes into each tank.
If you don't have a gauge, you can purchase a transfer switch to shut off the transfer pump when the subtank is empty.
A dual circuit ball valve allows both the supply and return to be switched at the same time. It is a good option for connecting two tanks together, but it is not necessary if your vehicle has a different setup.
