Rajan Wilcox
Draining the fuel tank of a Jaguar XJ8 can be a challenging task. One common issue is water getting into the fuel tank, which can cause the car to misfire on all cylinders and run sluggishly. To drain the tank, some people suggest using a siphon hose to transfer the fluid into a gas can, ensuring the can is lower than the tank. Others recommend removing the fuel tank and sucking out the contents, although this can be a complex process due to the need to remove the lines with a quick-disconnect tool. In some cases, it may be necessary to partially pull out the tank through the trunk and remove the top flange to access the fuel.
| Characteristics | Values |
|---|---|
| Water in the fuel tank | Drain the tank using a siphon hose |
| Fuel cap filler reservoir plugged | Clean out the fuel filler drain |
| No fuel pressure | Check fuses, replace the battery, use starting fluid |
| Clogged drainage around the cap | Remove the tank and clean the drainage |
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What You'll Learn
Siphoning the fuel tank
To siphon the fuel tank of your Jaguar XJ8, you will need a length of tubing or hose, a container to collect the fuel, and possibly a pair of pliers. The fuel tank is usually located beneath the car, near the rear wheels.
Firstly, find a suitable container to collect the fuel. This should be a closed container, such as a gas can, to avoid spilling fuel and to prevent exposure to gasoline fumes, which can be hazardous to your health.
Next, locate the fuel tank and insert one end of the tubing into the tank through the filler neck. Ensure that the tubing is secure and reaches the bottom of the tank. You may need to use pliers to help guide the tubing into place.
Then, place the container on the ground near the opening of the gas tank, ensuring that it is lower than the gas tank. This is important because siphoning works due to gravity; the gas will naturally flow from the higher tank into the lower container.
Finally, you can begin to siphon the fuel. If you are using a manual or electric pump, follow the manufacturer's instructions for safe and effective use. Alternatively, you can create pressure in the container using a small air compressor or bike pump. This will force the gas out of the tank and into the container. However, be cautious when using this method, as too much pressure can cause the gas tank to rupture or explode.
Note: It is important to respect other people's property and always gain permission before siphoning fuel from a vehicle. Additionally, siphoning fuel can be illegal in some areas, so always check local regulations before proceeding.
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Removing the fuel tank
Firstly, removing the tank itself is not overly challenging, except for the removal of the lines. The lines sit just above the rear differential and must be removed with a quick disconnect tool before removing any other tank fasteners.
If you are experiencing issues with water in your fuel tank, there are a few possible solutions. One suggestion is to siphon out the majority of the fuel and then add a litre of mentholated spirits to the tank. Menthol is water-miscible and should resolve the issue until you can refill with fresh fuel and a fuel system cleaner.
Another approach is to use a siphon hose to drain the tank. Place the hose in the gas tank and extend it into a gas can placed lower than the vehicle's gas tank. The pressure will move the gas into the can.
Alternatively, if you intend to replace the pump, you can try partially pulling out the tank and removing the top flange to suck out the fuel. However, this method may not be as effective as the previously mentioned options.
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Using a suction tool
To drain an XJ8 fuel tank using a suction tool, you can try the following method:
Firstly, you will need access to the fuel tank. This will involve removing the necessary bolts, filler boot, straps, and hoses that are holding the tank in place. Once you have removed these, you can pull the tank out.
Now, you can attempt to use the suction tool to drain the fuel. One method that has been tried is suction at the fitting before the fuel pressure damper. This method can be time-consuming, as it may take several hours to drain a few gallons of fuel.
Alternatively, you could try using a fuel transfer pump to remove the fuel. A diesel transfer pump, for example, should work for this purpose.
Another option is to try suction at the filter coupling, although one person has noted that a check valve may prevent this from working. However, this can be disputed, as a check valve is typically used to prevent fuel from flowing back into the tank, so it may be worth attempting this method if you have access to a spare pump.
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Dissolving water with HEET
If you have water in your Jaguar XJ8 fuel tank, the first step is to drain the tank. The drain at the fuel cap filler reservoir may be plugged, so you may need to use a siphon hose to drain the tank.
Once you have drained the tank, you can add HEET to dissolve any remaining water. HEET is a fuel additive designed to remove water from your fuel system. It breaks up the water in your fuel into small droplets that can combust in your engine. It can also help to prevent your fuel lines from freezing in cold weather.
To use HEET, simply pour a bottle of it into your fuel tank. Many mechanics recommend doing this every time you fill up during the winter months, especially if temperatures are consistently below 20° F. If temperatures are closer to 30° F, you may only need to use HEET once every two or three fill-ups.
In addition to HEET, you can also add a litre of mentholated spirits to the tank. Metho is water-miscible and should help to dissolve any remaining water. You can then refill the tank with fresh fuel and add a bottle of fuel system cleaner.
By following these steps, you can effectively dissolve water in your Jaguar XJ8 fuel tank using HEET and other fuel additives.
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Cleaning the fuel filler drain
To clean the fuel filler drain, you will need to remove the filter to access the drain tube. First, wiggle and pull upwards to remove the filter. Be careful, as it may be sticky if it has been a while since you last cleaned it.
Once the filter is removed, you can start cleaning the drain tube. One method is to use a thin wire, such as a 100# picture hanging wire, and feed it into the top holes of the drain tube. This will help to remove any debris or blockages. After this, pour water into the drain tube and observe if it is draining properly.
If the drain tube is still clogged, you may need to remove the rubber nipple to expose the hole. Clean the rubber nipple with soap and water, and rinse it thoroughly. You can also check if there is a mesh filter between the rubber nipple and the hole, as this may need cleaning as well.
Finally, reassemble the parts and ensure that the filter is correctly oriented. It is recommended to clean the fuel filler drain at least once a month to maintain optimal performance.
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Frequently asked questions
You can siphon out the majority of the fuel and then add a litre of mentholated spirits to the tank. The metho is water-miscible and should solve the problem until you can refill with fresh fuel and a bottle of fuel system cleaner.
There is no good way to drain the tank. If you are going to replace the pump, pull the tank partially out through the trunk and remove the top flange. Then you can suck it out through there.
The drain at the fuel cap filler reservoir might be plugged.
