Sylvie Willis
Bobcat mowers are a popular choice for landscaping and repair, but they can sometimes present issues with their fuel tanks. The stock gas tank does not have a drain plug, which can lead to fuel buildup and potential engine problems. Users have reported issues with fuel pumps not functioning properly, clogged fuel filters, and the need to manually squeeze the fuel primer ball to keep the mower running. To address these issues, some owners have resorted to using external fuel tanks or modifying the stock tank to include a fuel cut-off valve. Additionally, it is important to follow safety precautions when adding gas to any mower, such as allowing the engine to cool down and securing the gas cap to prevent spills and harmful vapors.
| Characteristics | Values |
|---|---|
| Fuel tank location | Varies depending on the model |
| Fuel type | Unleaded gas |
| Fuel tank capacity | 5 gallons |
| Fuel tank lid type | Screw-on |
| Fueling process | Use a funnel to gently pour gas into the tank |
| Fueling safety | Avoid spills, wait for the mower to cool down before fueling, and ensure the gas cap is secure |
| Fuel issues | Clogged fuel filter, fuel pump problems, air in the fuel lines, water in the fuel system |
| Fuel tank maintenance | Consider an external fuel tank to keep fuel fresh and avoid gas going bad |
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What You'll Learn
Fuel filter and pump issues
Bobcat mowers are known to have issues with their fuel systems, particularly fuel filters and pumps.
Fuel Filter Issues
Bobcat machines are known to burn through fuel filters every 50 hours. This is due to the filters being only 1 micron, while other brands' filters are generally 4 to 5 microns. This finer filtration can lead to frequent clogging, especially if the fuel contains water or other contaminants.
Fuel Pump Issues
Fuel delivery problems in Bobcat mowers are often caused by issues with the fuel pump. In some cases, the pump may become unable to draw fuel from the tank, even after being replaced. This could be due to a variety of factors, including:
- Vacuum issues: A break in the suction before the pump or a ruptured supply line can cause a loss of vacuum, preventing the pump from functioning properly.
- Blockages: Debris or blockages in the fuel tank or lines can restrict fuel flow and affect pump performance.
- Corrosion: Corroded connections or relays can disrupt the fuel pump's operation.
- Air in the fuel lines: Air pockets in the fuel lines can cause the pump to lose prime, resulting in reduced performance.
Troubleshooting and Solutions
To troubleshoot fuel filter and pump issues in Bobcat mowers, users can try the following:
- Replace the fuel filter: Clogged fuel filters are a common issue, and replacement is often recommended as a first step.
- Check for debris: Inspect the fuel tank and lines for any debris that could be causing blockages or restricting fuel flow.
- Test fuel lines: Create a test fuel line and attach it to the inlet of the fuel pump to check for suction issues or debris.
- Check for corrosion: Inspect connections and relays for any signs of corrosion, and clean or replace as needed.
- Remove air from the system: Air in the fuel lines can cause issues, so it's important to ensure the system is properly bled and any air pockets are removed.
- Upgrade the fuel pump: In some cases, upgrading to an electric fuel pump may provide more reliable performance and easier priming.
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Air leaks
To resolve air leak issues, several steps can be taken. Firstly, check for any visible signs of damage or leaks in the fuel lines and connections. Ensure that the fuel cap is tight and secure, and inspect the fuel tank for any cracks or damage. If the fuel filter is clogged, replace it with a new one, and consider using a fuel treatment to help remove any water or contaminants from the fuel system.
Additionally, the fuel pump may need to be inspected and potentially replaced if it is not functioning correctly. It is also recommended to keep the mower running for a couple of hours after addressing the issue to ensure that the air is purged from the system and to lubricate the components.
If you suspect air leaks in your Bobcat mower's fuel system, it is essential to address the problem promptly. Air leaks can lead to engine performance issues and, in some cases, engine damage if not rectified.
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Faulty gas caps
A faulty gas cap on your lawn mower can lead to a host of issues, ranging from reduced performance to safety hazards. The gas cap plays a critical role in sealing the fuel tank, preventing leaks, and ensuring efficient and safe operation. Here are some common signs and issues related to faulty gas caps:
Fuel Leaks and Evaporation
A faulty gas cap that doesn't seal properly can lead to fuel leaks, which pose fire hazards and contribute to environmental damage. In extreme cases, an improper seal can cause fuel evaporation, resulting in wasted resources and environmental harm. Gasoline leaks from faulty caps can easily ignite, creating a significant risk of fires that can cause property damage and personal injury.
Engine Performance Issues
An inadequate seal on the gas cap can affect fuel flow, leading to a noticeable decrease in engine performance or power output. Engine misfires, reduced fuel efficiency, and even engine stalls can be attributed to faulty gas caps. Additionally, a malfunctioning cap can allow dirt, debris, and moisture to enter the fuel system, causing clogs and further performance degradation.
Strong Odor of Gasoline
If you detect a strong gasoline odour, it may indicate a potential leak caused by a defective gas cap. This not only signals a performance issue but also poses safety risks due to the volatile nature of gasoline vapours.
Visible Cracks or Damage
Visible cracks or damage on the gas cap is a clear sign that it needs replacement. Over time, the cap can become worn or damaged, compromising its ability to seal properly and leading to the issues mentioned above.
Clogged or Obstructed Cap
Clogging or obstruction in the fuel cap vent is a common problem. This can cause the engine to stall or act up. Depending on the design, you may be able to clear the clog by poking a small hole with a pin or needle, or you may need to submerge the cap in an industrial cleaner and water mixture before rinsing and testing.
To summarise, a faulty gas cap on a lawn mower can lead to fuel leaks, evaporation, engine performance issues, safety hazards, and environmental damage. Regular inspection and maintenance of the gas cap are crucial to prevent these issues and ensure the optimal operation of your mower.
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Clogged fuel lines
A clogged fuel line can be caused by a variety of factors, including old, stale fuel, dirt and debris in the fuel tank, or a faulty fuel filter. Symptoms of a clogged fuel line include difficulty starting, sputtering, or a complete lack of power.
To determine whether your mower's fuel line is clogged, look for the following signs:
- Difficulty starting: If your mower struggles to start or takes a long time to catch, a clogged fuel line could be preventing fuel from reaching the carburetor.
- Sputtering and loss of power: A partially clogged fuel line can restrict fuel flow, leading to inconsistent engine performance, sputtering, and a loss of power.
- Engine stalling: A completely clogged fuel line will prevent fuel from reaching the engine, causing it to stall and refuse to restart.
- Fuel tank empty but the engine doesn't run: If your fuel tank is empty but the engine doesn't run, there may be a blockage preventing the fuel from reaching the carburetor.
- Safety first: Always work in a well-ventilated area and wear protective gear such as gloves and eye protection.
- Locate the drain plug: Most fuel tanks have a drain plug at the bottom.
- Drain the fuel: Carefully remove the drain plug and drain the fuel into a suitable container.
- Clean the tank: Use a clean rag or a brush to remove any sediment or debris from the inside of the tank.
- Replace the drain plug: Securely tighten the drain plug.
- Disconnect the fuel line: Locate the fuel line connection at the fuel tank and carburetor. Carefully disconnect the line by squeezing the clamps or using a flathead screwdriver to loosen the clamps.
- Inspect for blockage: Examine the inside of the fuel line for any visible signs of clogging, such as debris, rust, or discolouration.
- Clean the fuel line: If there is a blockage, use a thin wire or compressed air to clear the obstruction. For stubborn clogs, use a fuel line cleaner specifically designed for this purpose.
- Locate the fuel filter: Most lawn mowers have an inline fuel filter located near the fuel line. It may look like a small, cylindrical cartridge.
- Remove the old filter: Carefully detach the old fuel filter from the fuel line.
- Install the new filter: Securely attach the new fuel filter, ensuring a tight connection.
- Locate the primer bulb: Most lawn mowers have a primer bulb located near the carburetor.
- Prime the carburetor: Press the primer bulb several times to fill the carburetor with fuel.
- Reconnect the fuel line: Reconnect the fuel line to the carburetor, ensuring a secure connection.
- Start the engine: Try starting your lawn mower. If it starts smoothly, you have successfully unclogged the fuel line.
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Safety precautions when filling the tank
Safety should always be the top priority when filling a mower fuel tank. Here are some detailed safety precautions to follow when filling the tank of a Bobcat mower or any other gasoline-powered equipment:
Turn Off the Engine and Equipment:
Before filling the tank, turn off the mower's engine and any other equipment that is running. This reduces the risk of fire and allows the fuel to settle properly.
Disembark Passengers:
Ensure that all passengers and bystanders move away from the mower to a safe distance. This precaution minimizes the risk of injury or exposure to fumes in case of an accident.
Check Fuel Lines and Vents:
Inspect the fuel lines and vents for any signs of damage or leaks. This includes checking the fuel tank vent to ensure it is not blocked or restricted.
Close Hatches and Compartments:
Before refueling, close all hatches, compartments, windows, and openings to prevent gasoline fumes from entering enclosed areas and creating a hazardous environment.
Use Approved Containers:
Always use approved containers and portable fuel tanks to avoid leaks and spills. These containers are designed to safely handle and store flammable liquids.
Avoid Overfilling:
Do not overfill the fuel tank. Stop filling before it reaches the maximum level, leaving some space for the fuel to expand. This prevents accidental discharge through the fuel vent.
Keep a Fire Extinguisher Nearby:
Have a fire extinguisher easily accessible during the refueling process. This is a crucial precaution in case of a fire emergency.
No Smoking:
Strictly avoid smoking or any open flames near the fuel tank, both during refueling and when the mower is in use. This prevents possible hazards associated with fuel vapors.
Handle Spills and Leaks:
If a fuel spill occurs, immediately take action to contain and clean it up. Keep spill kits and absorbent pads handy to manage spills effectively and minimize environmental impact.
Secure Fuel Caps:
After refueling, tightly secure the fuel cap to prevent fuel leaks and evaporation. This also ensures that the fuel is properly contained and reduces environmental impact.
Stable Surface:
Always keep the fuel tank on the ground or on a stable, level surface during refueling to minimize the risk of spills and accidental tipping.
By following these safety precautions, you can help ensure a safe refueling process for your Bobcat mower or any other gasoline-powered equipment.
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Frequently asked questions
To fill your Bobcat mower with gas, first locate the gas tank and check if you need to prime your device. Then, fill your gas tank with fresh unleaded gas. Make sure to double-check that the gas cap is secure.
To prevent gas from going bad in your Bobcat mower's fuel tank, you can use an external fuel tank. You can unhook the fuel line from the fuel tank and run a line into the spout of a 5-gallon gas jug.
There could be several reasons why your Bobcat mower is not starting. It could be due to a clogged fuel filter, a faulty fuel pump, or a problem with the primer ball. Check these components and consider replacing them if necessary.
It is recommended to run your Bobcat mower regularly to prevent fuel issues. If the mower is left unused for extended periods, consider using an external fuel tank to keep the fuel fresh and prevent it from going bad.
Always let the mower cool down for 15 to 30 minutes before adding gas. Use a funnel to safely and easily pour the gas into the tank. Ensure the gas cap is secure before starting the mower. Avoid spilling gas on the engine to prevent harmful vapors or gas fires.
