Katerina Swanson
The Jaguar XJ6 is a sleek car with a unique feature: two fuel tanks. This dual-tank system has its advantages, such as having a spare tank when one runs dry, and not needing to fill up both tanks at once, which can be time-consuming. However, it can also lead to issues with overfilling and leaking if the changeover valve fails. To avoid this, there is a switch on the dash to alternate between the two tanks, which are located in the rear quarter panels. It's important to regularly drain the bottoms of the tanks to prevent a build-up of rust and dirt, a common issue in these classic cars.
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What You'll Learn
The location of the two tanks and the switch to swap between them
The Jaguar XJ6 is a classic car with dual fuel tanks located in the rear quarter panels. The car's fuel system is pressurised, and when unspent gas is returned to the tank, there is a valve to prevent overfilling one of the tanks. This valve can sometimes fail, causing one tank to be left empty and the other to overflow, leading to fuel leaks.
The switch to swap between the two tanks is located on the dash, close to the ignition switch. When the dash lights are on, an arrow illuminates, pointing to the right when the switch is out and to the left when it is in. This switch operates the cut-off valves in the rear wheel wells.
The dual-tank system offers several advantages, such as having a spare tank and the ability to run one dry without worrying about refilling from two separate openings, which can be time-consuming. Additionally, if one fuel pump fails, you can switch to the other tank.
It is important to note that the fuel tanks in the Jaguar XJ6 are prone to rusting, so it is recommended to drain the bottoms of the tanks each season to remove any rust and dirt.
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The cause of Jaguar's dual-tank system
The Jaguar XJ6 is a sleek car with a unique dual-tank system. The two fuel tank openings are located in the rear quarter panels of the car. The dual-tank system is designed to provide a spare tank and to reduce the impact of fluid movement on the car's stability. The separate tanks also allow for the use of a single fuel pump, which can be convenient in the event of a fuel pump failure.
The dual-tank system in the Jaguar XJ6 has a switch on the dashboard that allows the driver to swap between the two tanks. This switch operates cut-off valves in the rear wheel wells, controlling the flow of fuel from each tank. The switch is typically located close to the ignition switch, with an arrow illuminated by the dash lights indicating the selected tank.
One challenge with the Jaguar XJ6's dual-tank system is the potential for fuel contamination. The "cool-looking fuel fillers" on the top of the rear deck can lead to issues with water, dirt, rust, and vandalism. It is recommended to drain the bottoms of the tanks each season to remove any rust and dirt accumulation. Additionally, the fuel system is pressurised, and a closed valve can cause one tank to overflow when unspent fuel is returned to it.
The dual-tank system offers certain advantages, such as the ability to run one tank dry and the convenience of separate fuel tanks for shared vehicles. However, it is important to be aware of potential issues and properly maintain the fuel system to ensure a safe and enjoyable driving experience.
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How to avoid overfilling one tank and causing a leak
Filling up your Jaguar's dual fuel tanks is a straightforward process, but it's important to take precautions to avoid overfilling, which can cause leaks and damage to your vehicle. Here are some detailed instructions to help you avoid overfilling one tank and causing a leak:
Understand the Fuel Tank System: Jaguar's dual fuel tank system is designed for convenience and efficiency. The two separate tanks are located in the rear quarter panels, each with its own fuel pump and cut-off valves. This allows you to switch between tanks while driving, ensuring you always have a spare tank and extending your range.
Locate the Fuel Tank Switch: To switch between the two tanks, locate the switch on the dashboard, typically near the ignition switch. The switch should illuminate an arrow pointing left or right, indicating which tank is currently in use. This switch operates the cut-off valves in the rear wheel wells, controlling the flow of fuel from each tank.
Fill Tanks Individually: When filling up, focus on filling one tank at a time. Ensure the switch is set to the correct tank before starting. Fill the tank until the pump clicks, indicating it is full. Avoid the temptation to squeeze in a little extra fuel after the first click, as this can lead to overfilling and potential leaks.
Avoid Overfilling: Overfilling can cause fuel to spill and leak, damaging paintwork and creating a fire hazard. It can also force fuel into the vapor canister and EVAP system, causing clogging and performance issues. Be mindful of the fuel level and stop filling when the pump clicks or when you reach the recommended fuel level.
Monitor for Leaks: After filling up, pay attention to any signs of leaks. If you notice fuel dripping or pooling under the car, address the issue promptly. Leaks can occur due to faulty valves or overflow from overfilling. Regularly inspect the fuel system for any blockages or issues that may cause leaks.
By following these instructions and being mindful of your fuel levels, you can avoid overfilling one tank, reducing the risk of leaks and ensuring a safer and more enjoyable driving experience with your Jaguar's dual fuel tank system.
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The importance of draining the tanks each season
The Jaguar XJ6 is equipped with dual gas tanks, which are located in the rear quarter panels of the car. The dual-tank system offers several advantages, such as the convenience of having a spare tank and the ability to switch between tanks while driving.
However, it is important to properly maintain and manage the fuel system to ensure its safe and efficient operation. One crucial aspect of this maintenance is regularly draining and refuelling the tanks, preferably at the start of each season.
Firstly, draining the tanks helps to remove any built-up sediment or contaminants that may have accumulated over time. Water vapour, for example, can condense inside fuel tanks, and draining the tanks periodically helps to eliminate this moisture, reducing the risk of corrosion and improving fuel quality.
Secondly, seasonal fuel management is essential for maintaining fuel stability and preventing fuel degradation. Fuel can break down over time, leading to the formation of gums and varnishes that can clog fuel lines and injectors. By draining and refuelling the tanks each season, you ensure that the fuel remains fresh and less prone to degradation.
Additionally, draining the tanks provides an opportunity to inspect the fuel system for any potential issues. This includes checking the condition of the fuel pumps, valves, and other components for wear or damage. Regular inspection allows for proactive maintenance, helping to prevent unexpected breakdowns or performance issues.
Finally, by draining and refuelling the tanks, you can ensure that the fuel system is operating efficiently. Over time, air and vapour bubbles can form in the fuel lines, affecting the engine's performance and fuel economy. Draining and refuelling the tanks can help eliminate these air pockets, improving the overall performance and responsiveness of the vehicle.
In conclusion, regularly draining and refuelling the dual tanks of a Jaguar XJ6 is an important part of seasonal maintenance. It helps to maintain fuel quality and stability, ensures the proper functioning of the fuel system, and allows for proactive inspection and maintenance, ultimately enhancing the performance, reliability, and longevity of the vehicle.
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What to do if the changeover valve fails
If the changeover valve fails, it can cause the fuel pump to leave one tank empty and overfill the other. This can lead to fuel leakage through the vent system. In some cases, the engine may stop due to the valve not opening the correct tank.
To diagnose a faulty changeover valve, start by checking if you're getting any power at the valve using a 12v test light. If the changeover valve is not functioning correctly, it may be due to a gummed-up valve in the boot from the car sitting unused for extended periods.
If the changeover valve fails while driving, it is important to remain calm and take appropriate action. Firstly, try to identify the issue by observing the fuel levels in both tanks. If one tank is empty while the other is overfilled, it confirms a faulty changeover valve.
To address the issue, you can try tapping the valve to see if it opens the closed tank. This might be a temporary solution until you can get the valve replaced or serviced. In some cases, you may need to replace the valve with a compatible part from another vehicle, such as a Toyota Landcruiser, as suggested by another Jaguar owner.
To prevent future issues, it is recommended to regularly service your Jaguar and pay close attention to the fuel system, especially if the car is not used for extended periods. Keeping the fuel tanks maintained and rust-free can help avoid issues with the changeover valve and fuel leakage.
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Frequently asked questions
The Jaguar XJ6 and XJ12 Series I, II & III have two gas tank openings in the back, which are two separate tanks.
There should be a switch on the dash to swap between the two tanks. The switch should be the one closest to the ignition switch. When the dash lights are on, an arrow should illuminate, pointing to the right when the switch is out and to the left when the switch is in.
It's handy to have a spare tank, and it's also useful to have two tanks in case one fuel pump fails.
The changeover valve can fail, causing the fuel pump to leave one tank empty and overfill the other, leading to fuel leaks. The tanks can also rust out, so it's important to drain the bottoms of the tanks each season and let all the rust and dirt out.
It takes a long time to fill both tanks through one hole, and if you move to the other hole, the first tank may not be full.
