Rajan Wilcox
Bleeding the fuel lines of a Bobcat machine can be a challenging task, especially for those unfamiliar with diesel mechanics. One of the most common issues with Bobcats is air in the fuel lines, which can cause the machine to stall. This problem may be due to a bad grommet in the fuel tank, a clogged screen, or a faulty pickup tube. To fix this, owners may need to clean the fuel tank, replace the grommet and filler tube, or change the supply and return fuel lines. Additionally, when changing the fuel filter, it is important to prime the injectors and open the fuel line knob on the injection pump to allow fuel to flow back to the tank. Using an electric fuel pump or an air blow gun wrapped in a rag can also help remove air from the system.
How to Bleed Fuel Lines on a Bobcat
| Characteristics | Values |
|---|---|
| Fuel Filter | Clean diesel |
| Priming | Priming the injectors |
| Knob | Located above the oil fill cap |
| Venting | Through the knob |
| Pump | Electric or hand pump |
| Air Blow Gun | Wrapped in a rag and placed in the fuel filler pipe |
| Return Line | Hooked up after seeing fuel run out |
| Key | On when priming |
| Grommet | Accessibly located in the fuel tank |
| Fuel Line Inlets | Located under the cab |
| Fuel Tank | Removed, cleaned, and refuelled |
| Glass Settlement Bowl | Changed |
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What You'll Learn
Using the pump and screw method
The pump and screw method is a common technique for bleeding fuel lines on a Bobcat. This process involves using a combination of the pump and a bleeder screw to remove air from the fuel system and ensure proper fuel flow. Here is a detailed guide on using this method:
Locate the fuel filter: Begin by locating the fuel filter on your Bobcat. The fuel filter is typically found near the injection pump or the fuel tank.
Open the bleeder screw: On the housing that the fuel filter screws onto, you will find a bleeder screw. Open this screw by turning it counterclockwise. This will allow air to escape from the fuel system. You may need to depress the primer bulb while doing this.
Pumping and priming: With the bleeder screw open, it's time to start pumping. Use a hand pump or an electric fuel pump to pump fuel through the system. Ensure the key is on during this process. Keep pumping until you see that fuel is flowing smoothly and consistently.
Tighten the bleeder screw: Once you have established a good fuel flow, tighten the bleeder screw by turning it clockwise. Make sure it is securely tightened to prevent any fuel leaks.
Repeat if necessary: Depending on the severity of the air issue, you may need to repeat the above steps multiple times to completely bleed the air from the system.
It is important to note that different models of Bobcats may have slight variations in their fuel systems. Always refer to your owner's manual or seek advice from a qualified mechanic if you are unsure about any steps or procedures. Additionally, remember to take appropriate safety precautions when working with fuel and machinery.
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Locating the bleeder screw
One common location for the bleeder screw is on the housing that the fuel filter screws onto. Typically, this bleeder screw is found on top of the housing. By opening this screw, you can allow air to escape while depressing the primer bulb. It may be necessary to open and tighten the screw multiple times to completely remove the air from the system.
In some Bobcat models, such as the 773, the issue of air in the fuel lines may be caused by a bad grommet in the fuel tank. This component can be accessed by raising the cab and locating the black poly fuel tank, which is usually found slightly under the engine. The fuel lines, consisting of one feed and one return line, run rearward under the engine.
Additionally, certain Bobcat models, like the 843, may feature a long gold tube with the labels "fuel in" and "oil out." This tube could be part of the fuel bleeding mechanism, potentially including a toggle lever at the bottom for this purpose. However, it is always recommended to refer to the service manual or seek advice from a diesel mechanic to ensure accurate information specific to your Bobcat model.
It is important to note that before attempting to bleed the fuel lines, basic maintenance steps should be followed. This includes cleaning the fuel tank, pickup, and fuel line, as well as replacing the fuel filter and glass settlement bowl if necessary. By taking these proactive measures, you can help ensure the optimal performance of your Bobcat vehicle and reduce the likelihood of encountering fuel-related issues.
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Using an electric fuel pump
If the pump and screw method outlined in the owner's manual is not working, an electric fuel pump can be used to bleed the fuel lines of a Bobcat. This can be installed either permanently or temporarily.
If you don't have access to an electric pump, you can use an air blow gun wrapped in a rag, placed into the fuel filler pipe. Apply gentle pressure and watch for fuel to run out of the return line.
Make sure the key is on when you are trying to prime.
If you are still unable to get fuel past the filter, you may need to plug the return in the tank and leave the hose open.
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Using an air blow gun
If you don't have an electric pump, you can use an air blow gun to bleed the fuel lines on a Bobcat. First, pull and plug off the return from the tank. Then, take your air blow gun, wrap a rag around it, and place it into the fuel filler pipe.
Next, gently puff the tank and watch for fuel to run out of the return line. It is important to be gentle during this step to avoid damaging any components. Once you have completed this step, hook the return back up and you're ready to go! Make sure that the key is on when you are trying to prime.
If you are having trouble getting fuel past the filter, try leaving the hose open. Additionally, make sure that you have the key on and that you are using the correct pump. If you are still having issues, it may be due to a faulty component such as the fuel filter rubber o-ring.
It is important to note that this method should be used with caution as working with fuel and compressed air can be dangerous. Always refer to the owner's manual or seek professional assistance if you are unsure about any steps or procedures.
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Cleaning the fuel tank
To clean the fuel tank of your Bobcat, you will first need to remove the fuel tank. Once the tank is removed, clean the pickup and fuel line inside the tank. You can do this by wrapping a rag around an air hose and putting light pressure in the fuel tank with the cap off.
After cleaning the tank, it is important to inspect the dip tube for any cracks. If there are cracks, you will need to replace the supply and return fuel lines. If your machine does not have a prime pump, consider installing a hand prime bulb and a shut-off valve before the primary fuel filter to make future fuel filter changes easier.
In addition to cleaning the fuel tank and fuel lines, you may also need to clean or replace the fuel filter and the settlement bowl. A clogged fuel filter can cause the engine to run sluggishly or not at all, so it is important to ensure that it is clean and free of debris.
Finally, some Bobcat models may have a grommet in the fuel tank that can cause air to enter the fuel lines. If your Bobcat has this issue, you may need to access and replace the grommet and filler tube. This may require removing the engine, but it is recommended that you consult a diesel mechanic for guidance if you are unsure.
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Frequently asked questions
If your Bobcat is an 843, you can try wrapping a rag around an air hose and putting light pressure in the fuel tank with the cap off. If it is a 773, you should check the grommet in the fuel tank, as this is a common cause of air in the fuel lines. If you have a Kubota engine, you can open the fuel line knob on the injection pump, run the primer pump, and leave it open 1/4 turn while cranking it up.
You can use an electric fuel pump to get the air out of the system.
Pull and plug off the return from the tank, take an air blow gun, wrap a rag around it, and place it into the fuel filler pipe. Gently puff the tank and watch for fuel to run out of the return line.
Make sure you have the key on when you are trying to prime.
