Bobcat 573 Fuel System Troubleshooting

[MikePhua]

Bobcat skid steer loaders, including models like the 573, are integral pieces of equipment in various industries, from construction to landscaping. These machines are renowned for their versatility and durability. However, like any heavy machinery, they can experience fuel-related issues that hinder performance. Understanding these issues and how to troubleshoot them can prevent costly downtime and keep your Bobcat 573 running smoothly.
Common Fuel System Issues in Bobcat 573
Fuel problems can manifest in different ways. They can range from poor engine performance, starting difficulties, to complete engine failure. In Bobcat 573 skid steers, most fuel-related problems can be traced back to several common causes:

1. Fuel Contamination
   Contaminants such as dirt, water, and rust in the fuel tank can clog the fuel filters, injectors, and fuel lines, leading to poor engine performance. This is particularly problematic if the machine has been sitting idle for an extended period or if low-quality fuel was used.
   
2. Clogged Fuel Filters
   The fuel filter is designed to catch impurities in the fuel before they reach the engine’s injectors. Over time, fuel filters can become clogged with debris and contaminants, restricting fuel flow and affecting engine performance.
   
3. Fuel Pump Failure
   The fuel pump is responsible for supplying fuel from the tank to the engine. If the pump becomes faulty, either due to wear and tear or a clogged fuel filter, the engine may not receive enough fuel to run properly, causing stalling or power loss.
   
4. Air in the Fuel System
   Air entering the fuel system can lead to improper fuel delivery, causing the engine to run erratically or not start at all. This issue typically arises if the fuel lines are disconnected, damaged, or not properly sealed.
   
5. Faulty Injectors
   Fuel injectors are responsible for atomizing fuel and delivering it into the combustion chamber. If the injectors become dirty or malfunction, the fuel may not be distributed evenly or properly, causing misfires, rough idling, or lack of power.
   

Diagnosing Fuel Problems in the Bobcat 573
Diagnosing fuel system issues in the Bobcat 573 requires a systematic approach. Here’s a step-by-step guide to troubleshooting common fuel problems:
Step 1: Check the Fuel Filter
The fuel filter should be the first point of inspection. If the filter is clogged, it restricts the flow of fuel to the engine. Start by removing the filter and checking for any visible signs of dirt, rust, or debris. If the filter appears dirty or is over a year old, it’s time to replace it with a new one.

• Signs of a Clogged Fuel Filter:
  • Difficulty starting the engine.
    
  • Reduced engine performance or power.
    
  • Engine stalling during operation.
    

Step 2: Inspect the Fuel Lines for Leaks or Damage
Next, check the fuel lines for any signs of damage or leaks. Fuel lines are prone to wear and tear, especially in older machines. Any cracks or holes in the lines can allow air to enter the system or fuel to leak out, causing a drop in fuel pressure.

• How to Check:
  • Inspect the fuel lines for cracks, bulges, or visible leaks.
    
  • Ensure that all hose connections are tight and secure.
    
  • If any damage is found, replace the fuel line immediately.
    

Step 3: Verify Fuel Quality
Check the quality of the fuel in the tank. Contaminated or old fuel can clog the system and cause poor engine performance. If the fuel is murky, contains water, or smells off, it may need to be drained and replaced with fresh, clean fuel.

• Fuel Contamination Warning Signs:
  • White smoke from the exhaust.
    
  • Difficulty starting the engine after fueling.
    
  • Engine sputtering or losing power.
    

Step 4: Bleed the Fuel System
If you suspect air is trapped in the fuel system, you’ll need to bleed the system to remove the air. This can typically be done by loosening the bleed screws on the fuel filters and allowing fuel to flow until air bubbles stop appearing.

• Symptoms of Air in the Fuel System:
  • Engine cranks but doesn’t start.
    
  • Engine starts but runs rough or stalls frequently.
    

Step 5: Test the Fuel Pump and Injectors
If the above steps do not resolve the issue, the problem could be a faulty fuel pump or fuel injectors. A weak or non-functional fuel pump may not provide enough fuel to the engine, while clogged or malfunctioning injectors can disrupt proper fuel atomization. In this case, professional service may be needed to test and repair or replace these components.

• Signs of Fuel Pump or Injector Problems:
  • Engine stalls after a few minutes of running.
    
  • No fuel delivery when cranking the engine.
    
  • Poor engine acceleration or power loss.
    

Preventative Measures to Avoid Fuel Problems
Preventing fuel-related problems is easier than troubleshooting them. Regular maintenance and proper fueling practices can go a long way in ensuring that the Bobcat 573’s fuel system remains in good condition.

1. Regular Fuel Filter Replacement: Fuel filters should be replaced at least once a year or after 500 hours of use, whichever comes first. This helps ensure clean fuel is being delivered to the engine.
   
2. Use Clean, Quality Fuel: Always purchase fuel from reputable sources, and avoid using old or contaminated fuel. Consider using a fuel additive that prevents water buildup and enhances fuel quality.
   
3. Proper Fuel Storage: Ensure that fuel tanks are kept sealed to prevent water contamination. Store fuel in clean, dry containers to avoid rust and dirt buildup.
   
4. Frequent Inspections: Periodically inspect the fuel lines and fuel system for leaks, damage, or wear. Catching small problems early can prevent larger, more costly repairs later on.
   

Conclusion
Fuel problems in Bobcat 573 skid steer loaders can be caused by a variety of factors, ranging from clogged filters and contaminated fuel to faulty pumps and injectors. By regularly maintaining the fuel system, using quality fuel, and replacing components as necessary, operators can avoid many of the common fuel-related issues that arise. If problems persist despite troubleshooting, it may be time to consult a qualified technician for more advanced repairs. By taking a proactive approach to fuel system maintenance, operators can keep their Bobcat 573 running efficiently for years to come.