Sylvie Willis
Bobcat vehicles are prone to fuel leaks, which can cause the engine to stall or run rough. Fuel leaks can be caused by a variety of issues, including faulty injectors, cracked hoses, or a disconnected vent tube. While some temporary fixes are available, such as using duct tape or replacing the injector seal, a more permanent solution may require purchasing a new fuel hose or taking the machine to a Bobcat dealer for a thorough pressure washing.
Can I run Bobcat if the return fuel line is leaking?
| Characteristics | Values |
|---|---|
| Running Bobcat with a leaking return fuel line | Not recommended due to safety concerns and potential engine damage |
| Temporary fixes | Duct tape, clamps, replacing the fuel filter |
| Permanent fixes | Replacing the return fuel line, fixing the injector, repairing/replacing the fuel tank |
| Common causes | Aged/cracked hoses, faulty injectors, damaged fuel tank |
| Symptoms | Fuel leaks, engine not starting, loss of power, rough idle, stalling |
| Models affected | Bobcat 320, 331, 743, 751, 753, 763, 773, 863, 873, S185, S630, T300, T320 |
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What You'll Learn
Temporary fixes for a leaking return fuel line
If you have a leaking return fuel line, it is recommended to shut down the machine and fix the leak before starting any jobs. However, if you need a temporary fix to get home or to a repair shop, there are a few things you can try.
One option is to use a small length of rubber hose, slightly larger than the metal line, and two small screw clamps. Cut the leaking section out of the metal line with bolt cutters, then quickly insert the rubber hose onto the two ends of the metal line, with the clamps already on the hose, and screw them tight.
Another option is to use duct tape and a clamp. Wrap the tape around the leaking area and add a clamp if possible. However, be aware that gasoline can dissolve most tape adhesives, so this solution may not last long.
If your return fuel line is made of rubber and it's a low-psi line, you can use a fuel injection rubber hose and clamps to fix the leak.
In any case, it is important to get the fuel line properly repaired or replaced as soon as possible to avoid further issues and potential safety hazards.
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How to identify the source of the leak
If you suspect that your Bobcat vehicle has a leaking fuel line, there are several ways to identify the source of the leak. Firstly, it is important to regularly inspect the entire length of the fuel line for any signs of damage, cracks, wear, or corrosion, especially at connections and junctions where leaks are more likely to occur.
One of the earliest signs of a leaking fuel line is the strong and distinct smell of gasoline inside the vehicle while driving. This indicates that fuel is escaping from the fuel line. Additionally, if you notice that your vehicle is burning through fuel faster than usual, this could be a sign of a leak. Check for fuel leaks along the side of your vehicle, especially after long drives or when the vehicle has been parked for extended periods.
Another indication of a fuel line leak is a hissing sound when the vehicle is running, similar to the sound of a tyre releasing air. This sound is most noticeable when the engine is idle or immediately after turning it off, and it may be accompanied by a drop in fuel efficiency due to the loss of pressure in the fuel system.
You can also use specialised diagnostic tools to help detect fuel line issues. These tools are typically available at automotive service centres. If you are unable to inspect the fuel line yourself or suspect a leak, it is important to contact a mechanic as soon as possible to avoid further complications and potential engine damage.
- Place your vehicle on jacks and use a flashlight to follow along the fuel line, which runs from the rear of the vehicle to the front. Look for areas with a buildup of dust, grime, or wet spots, which could indicate a fuel leak.
- Add a dye to your fuel: There are special dyes that you can add to your fuel that will glow under a black light, helping to pinpoint the location of the fuel leak.
- Use a fuel detector: This device will detect the compounds found in gasoline and diesel. If you can smell gasoline but cannot locate the source with a flashlight or dye, a fuel detector can help identify the leak.
- Inspect the small harness that goes behind the alternator: On some Bobcat models, issues with the alternator and related components, such as the battery, can contribute to fuel line problems. Ensure you have battery power on the battery terminal of the alternator, and check for voltage signals on the exciter wire going to the alternator when the engine is running.
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Steps to take before attempting to run the Bobcat
If you suspect a fuel leak in your Bobcat, there are several steps you should take before attempting to run the machine to ensure your safety and identify the source of the leak. Here are the steps you should follow:
Identify the Source of the Leak
Firstly, it is crucial to identify the source of the fuel leak. Check the engine compartment for any signs of fuel leakage, including wet or fuel-soaked areas. Inspect the fuel lines, hoses, and fittings for any cracks, holes, or loose connections. Look for signs of fuel accumulation or dripping. If you cannot pinpoint the exact source, consider using a fuel dye and a UV leak detector kit to locate the leak.
Drain the Fuel Tank
If you confirm that the fuel tank is leaking, it is essential to drain it as soon as possible. Disconnect the fuel line downstream of the tank or siphon the fuel out by feeding a hose down the fuel fill. Ensure you have an equivalent volume of fuel containers ready to minimize spillage, and always use metal containers to avoid static electricity buildup.
Contain the Spill
It is crucial to contain the fuel spill to prevent environmental contamination and comply with legal requirements. Use fuel containers to collect the drained fuel, and never dump fuel or oil into waterways. Be cautious, as ungrounded plastic fuel containers can generate static electricity during the fuel transfer process.
Avoid Ignition Sources
Until the leak is fixed and the spilled fuel is cleaned up, avoid any potential ignition sources. Do not use power tools, and ensure no one smokes or uses open flames near the Bobcat.
Fix the Leak
Once the leak is identified, take the necessary steps to fix it. This may involve replacing leaking hoses, tightening connections, or seeking professional assistance for more complex repairs. Ensure you obtain the correct parts or hoses specifically designed for your Bobcat model.
Inspect and Maintain Your Bobcat
Regularly inspect your Bobcat's fuel system to prevent future leaks. Annual inspections are recommended, if not more frequently. Keep the engine and fuel lines well-maintained, and address any issues promptly.
Remember, dealing with a fuel leak can be hazardous, and it is crucial to take the necessary precautions. If you are unsure about any aspect of the process, seek professional advice or assistance to ensure your safety and the proper functioning of your Bobcat.
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Long-term solutions to a leaking return fuel line
Running a Bobcat with a leaking return fuel line is not advisable, as it can lead to larger issues over time, including inefficiency, increased maintenance costs, and potential equipment failure. Therefore, it is important to address the issue promptly and find long-term solutions. Here are some detailed, direct, and instructive suggestions for dealing with a leaking return fuel line in a Bobcat:
Firstly, identify the source of the leak. Inspect the fuel tank, fuel lines, injectors, and hoses for any signs of wetness or dripping fuel. Check the fittings and hoses for any cracks or holes, as these are common sources of leaks.
If you have identified a leaking return fuel hose, as is common in Bobcat 863 models, the long-term solution is to replace the hose. Obtain the correct type and length of fuel hose, ensuring it is compatible with your Bobcat's engine. Turn off the fuel supply, drain the remaining fuel, and remove the old hose. Install the new hose securely, ensuring it is clamped or properly connected to the fuel injector.
In some cases, the leak may be coming from the fuel tank itself. If you suspect this, carefully remove the tank for a thorough inspection and repair or replacement.
Additionally, consider the following preventative measures to reduce the likelihood of future leaks:
- Apply a light layer of hydraulic oil to O-rings and threads to enhance the seal, reduce friction, and prevent premature wear.
- Maintain proper hydraulic fluid temperatures, as fluctuations can cause seals to expand, contract, or crack.
- Consult a specialist for temperature-rated coupler solutions if operating in extreme temperatures.
- Regularly inspect and maintain the small harness that goes behind the alternator, as well as the alternator itself, to prevent voltage-related issues that can impact fuel delivery.
Remember, always prioritize safety when working with fuel systems. If you are uncomfortable or unsure about any aspect of the repair or maintenance process, consult a qualified technician for assistance.
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How to prevent future fuel line leaks
While it is not recommended to operate heavy machinery with a fuel leak, there are ways to identify and address the issue to prevent future fuel line leaks.
Firstly, it is important to identify the source of the leak. Check for signs of fuel leaks, such as a strong gasoline odour inside the vehicle, a pool of fuel on the ground, or a hissing sound akin to air escaping from a tyre. These issues can indicate a leaking fuel line.
If you identify a fuel leak, it is crucial to address it promptly. Contact a professional mechanic, especially if you don't have experience with heavy machinery. They can perform pressure tests and use specialised diagnostic tools to identify the exact source of the leak.
If you choose to address the issue yourself, ensure you have the necessary skills and knowledge. Here are some general steps to prevent future fuel line leaks:
- Regularly inspect the entire length of the fuel line for cracks, wear, or damage. Pay close attention to connections and junctions, as leaks are more likely to occur at these points.
- If you identify any issues, replace the affected parts. For example, if a fuel hose is leaking, obtain a new hose of the same type and replace it.
- Ensure all connections are secure and tight, but be careful not to over-tighten, as this can also lead to leaks.
- Use sealants or Teflon paste sparingly and only on the flare of the tubing, not on the threads.
- If the fuel line is damaged due to corrosion, ensure you address the underlying cause, such as exposure to moisture, salt, or debris.
- Consider the age of your vehicle and its fuel lines. Older vehicles are more susceptible to fuel line leaks, and replacing aged parts can help prevent future leaks.
Remember, working with fuel and heavy machinery can be dangerous. If you are unsure or uncomfortable performing any of these tasks, consult a professional mechanic.
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Frequently asked questions
No, if the return fuel line is leaking, you should shut it down and fix the leak before starting any jobs.
You need to obtain a foot or two of the hose from a distributor and replace the return lines. You can also apply duct tape around it and try to add a clamp as an intermediate fix.
If you notice fuel on the engine, it could be leaking from around the nut of the fuel high-pressure line.
Try to tighten the nut of the fuel high-pressure line. If that doesn't work, you may need to replace the fuel line.
This could be due to a weak lift pump or a crack in the pickup from the tank, allowing air in. Try running the machine and have someone squeeze the primer bulb; if the revs pick up, it's likely an issue with the lift pump.
