Mercedes Mullins
Kubota is a popular brand of tractors and construction equipment. Kubota diesel fuel tanks are prone to water clogging, especially if they are left idle for a few months. This can cause the engine to cut off shortly after ignition. If your Kubota diesel tractor won't start, it may be due to air in the fuel lines, which can occur if the tractor runs out of fuel. To open a Kubota diesel fuel tank, you can try removing the fuel line going into the filter and using an air hose to pump air and force the fuel out of the tank.
| Characteristics | Values |
|---|---|
| What to do if your Kubota diesel fuel tank won't start after filling | Ensure that no air gets into the fuel lines. Follow the fuel line from the filter to the engine, then open the small knurled tap. Operate the engine decompressor, turn the engine over on the starter for 10 seconds, and push in the red knob. After a few minutes, shut the knurled tap. |
| How to drain water from the tank | Drain the tank and lines, replace the fuel filters, and refill the tank with clean diesel. Remove the fuel filter and allow the fuel to drain from the hoses. Drain the fuel water separator. |
| How to force the fuel out of the tank | Remove the fuel line going into the filter. Use an air hose and a rag to plug the tank opening, then pump air to gently force the fuel out. |
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What You'll Learn
Removing water from the tank
Water in diesel fuel tanks is a common issue, especially when equipment sits idle for a few months. To remove water from your Kubota diesel fuel tank, follow these steps:
Step 1: Drain the Tank
Before starting, ensure you are wearing appropriate safety gear, including gloves and eye protection. Begin by draining the tank completely. If your tractor has a split fuel tank, you may need to consult your dealer or the manual for specific instructions. For some Kubota models, you can remove the line from the tank at the filter and let it drain into a container.
Step 2: Clean the Tank
After draining, clean the tank to remove any remaining water, sediment, or contaminants. You can use a siphon to clean out the tank and rinse it with clean diesel. Alternatively, you can use a shop vac with a water hose attached to the nozzle using duct tape. This setup can help remove liquids and debris from the tank.
Step 3: Address the Fuel Lines and Filters
Once the tank is drained and cleaned, pay attention to the fuel lines and filters. Drain the fuel from the hoses and remove the fuel filter. Clean or replace the fuel filter, and ensure that the fuel water separator is also drained.
Step 4: Refill and Reprime
When replacing the fuel filter, fill it with clean diesel to make priming easier. Reprime the system by opening the bleeder at the injection pump or loosening the line to release any remaining air. Then, tighten the line or bleeder, and refill the tank with clean diesel fuel.
Step 5: Prevent Future Issues
To prevent water and sediment issues in the future, always keep the tank full to prevent condensation. Additionally, be mindful of the fuel cap, ensuring it is securely closed after fuelling to avoid contamination and moisture entry. Regularly inspect the fuel cap's vent hole to prevent blockages, which can cause vacuum issues and engine problems.
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Draining diesel fuel
To drain diesel fuel from a Kubota diesel fuel tank, it is recommended to wait until the tank is almost empty. If there is a significant amount of fuel remaining, it may be necessary to use a fuel pump to remove it.
Once the tank is mostly empty, the next step is to locate and remove the fuel filter. This is usually found under the tractor, ahead of the HST and under the driver's position. It is an in-line type filter, so it should be simple to disconnect. Place a container underneath the filter to catch the remaining fuel as it drains.
If there is crud or sludge in the bottom of the tank that needs to be cleaned out, one method is to use a shop vac with a water hose duct-taped to the nozzle. Turn on the shop vac to start sucking out the sludge.
Another option for draining diesel fuel is to use a siphon. This method can also be used to remove gas from a diesel tank if needed. Simply siphon the tank, replace the filter, and reprime.
It is important to note that diesel fuel should not be left sitting for extended periods, as it can separate and clog the diesel particulate filter. Always drain and store your tractor empty if it will not be used for a couple of months or more.
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Bleeding the fuel line
To bleed the fuel line, first, loosen the little bleeder screw on top of the fuel filter housing. Then, turn the key to the "on" or "run" position, but do not crank the engine. This will allow the electric pump to start pumping air out of the system. Leave the key in this position for a few minutes to circulate fuel through the system.
If this does not work, you may need to crack the nuts on the injectors and bleed the system manually. To do this, crack the nut on the furthest injector and crank the engine until fuel comes out. Then, tighten the nut and start the engine. The engine will run rough at first, so let it sit until it smooths out.
It is important to note that you should not loosen the injector lines unless absolutely necessary, as this can cause issues with the delivery valves. Additionally, make sure to fill the filter canister back up with fuel after bleeding the system.
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Cleaning the tank
To clean the tank, you must first drain the fuel. You can then begin the process of cleaning the tank and fuel lines.
One method is to blow out the fuel lines with compressed air. You can then use a solvent such as MEK or acetone to break up any sludge. Alternatively, a degreaser like Purple Power can be used, followed by a pressure washer. It is important to ensure the tank is completely dry before reinstalling it.
Another method is to fill the tank with clean diesel fuel, swill it around by shaking, and then empty the tank. Repeat this process until clean fuel spills out.
If your tank is plastic, be aware that certain solvents may weaken the plastic. In this case, it is recommended to simply hose the tank and rinse and repeat until it is clean.
You can also try using a turkey baster with a hose extension to remove as much of the dirt and water as possible. Then, use a clean washcloth wrapped with wire to attract any remaining debris.
Finally, consider adding a biocide to your fuel to kill any lingering bacteria.
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Removing the fuel filter
To remove the fuel filter on a Kubota diesel fuel tank, you will need a wrench, a pinch tool, and a dip tray. It is also recommended to have a clean rag at hand to avoid making a mess.
Firstly, locate the fuel filter. Kubota tractors generally have two filters, with one typically located in the tractor engine compartment, and the other usually found underneath the tractor. The exact location of the fuel filter will depend on the tractor model, so be sure to check your operational manual.
Once you have located the fuel filter, use the wrench to remove it. Be sure to safely discard the old filter and wipe any exposed surfaces of the filter mount.
At this point, you can install a new fuel filter. Apply a light film of fuel to the mating surface of the new filter, then turn it in tightly by hand.
After installing the new filter, it is important to wipe and clean any areas that may have spilled fuel on them. Finally, remember to reopen the fuel filter shut-off, which must be done after every fuel filter change.
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