Troubleshooting the Genie TMZ 50 Bi-Fuel: Issues with the Gas Side Powering Up

[MikePhua]

The Genie TMZ 50 Bi-Fuel is a versatile and efficient aerial work platform designed for a wide range of industrial and construction applications. Its bi-fuel system allows it to operate on either gasoline or LP (liquefied petroleum) gas, giving operators the flexibility to choose between two power sources based on availability or preference. However, like all machinery, the Genie TMZ 50 can encounter issues over time, especially with its fuel system.
One common issue that operators face is the gasoline side of the engine powering up, while the LP side fails to start or provide power. This issue can cause frustration as it affects the overall functionality and versatility of the equipment.
In this detailed guide, we’ll explore possible causes for this problem, troubleshooting steps, and preventive measures to keep the Genie TMZ 50 Bi-Fuel running smoothly.
Understanding the Bi-Fuel System in the Genie TMZ 50
Before diving into troubleshooting, it’s important to understand how the bi-fuel system works. The Genie TMZ 50 is designed to run on two fuel sources:

1. Gasoline – A conventional fuel used in many engines, offering wide availability and reliability.
   
2. Liquefied Petroleum (LP) Gas – A clean-burning fuel commonly used in machinery to reduce emissions.
   

The bi-fuel system automatically switches between these two fuel types based on the user’s preference and the fuel supply available. Both fuel systems are integrated into the engine’s control unit, which manages the power output depending on the selected fuel type.
When the engine is running on gasoline, it typically starts up with ease. However, when switching to LP gas, the system may encounter problems, leading to the gas side powering up, while the LP side fails to function correctly.
Common Problems with the Gas Side Powering Up
There are several potential causes for why the gasoline side of the Genie TMZ 50 Bi-Fuel powers up while the LP side does not. Below are the most common issues and their corresponding solutions:
1. Faulty LP Regulator
The LP regulator is an essential component in any bi-fuel system, controlling the flow of LP gas from the tank to the engine. If the regulator fails, it may prevent the engine from receiving enough LP gas to start or run properly, even if the gasoline side is functioning.

• Possible Causes:
  
  1. Clogged or Faulty Regulator: Over time, the regulator can become clogged with debris or deteriorate due to wear and exposure to harsh environmental conditions.
     
  2. Incorrect Pressure Settings: If the regulator is not set to the correct pressure for the system, it may fail to provide enough LP gas for operation.
     
• Troubleshooting Solutions:
  
  1. Inspect the Regulator: Check the LP regulator for any visible signs of wear or damage. Look for leaks, cracks, or loose connections.
     
  2. Replace if Necessary: If the regulator appears damaged or clogged, replace it with a new one to ensure proper gas flow.
     
  3. Check Pressure Settings: Verify the pressure settings on the regulator to ensure they align with the manufacturer’s recommendations.
     

2. LP Gas Tank Issues
If the LP gas tank is not properly pressurized or has insufficient fuel, the Genie TMZ 50 may fail to switch to LP mode. Problems with the LP tank could include a faulty valve, low gas levels, or contamination within the tank.

• Possible Causes:
  
  1. Low Fuel Levels: If the LP gas tank is low on fuel, the system may default to gasoline to avoid running out of power.
     
  2. Faulty Valve or Leaks: A malfunctioning valve or leaks in the tank can restrict the flow of LP gas to the engine.
     
  3. Contaminated Fuel: Dirt or moisture in the LP gas tank can clog the system, preventing gas from reaching the engine.
     
• Troubleshooting Solutions:
  
  1. Check Fuel Levels: Ensure the LP tank is filled to an appropriate level. If the tank is empty or near empty, refill it to restore the LP system’s function.
     
  2. Inspect for Leaks: Check the LP gas tank and its connections for leaks. Tighten or replace any faulty components to stop gas from escaping.
     
  3. Clean or Replace the Tank: If contamination is suspected, consider draining the tank and cleaning it before refilling with fresh LP gas.
     

3. Electrical System Issues
The electrical system plays a critical role in switching between fuel types on the Genie TMZ 50 Bi-Fuel. If there’s an issue with the electrical components controlling the fuel system, it could lead to the gas side operating while the LP side fails to start.

• Possible Causes:
  
  1. Faulty Fuel Selector Switch: The switch that determines whether the engine runs on gasoline or LP gas may malfunction, preventing the system from switching to LP gas.
     
  2. Wiring or Connection Issues: Loose or corroded electrical connections can interfere with the proper functioning of the fuel system.
     
• Troubleshooting Solutions:
  
  1. Test the Fuel Selector Switch: Use a multimeter to check the fuel selector switch for continuity. If the switch is faulty, replace it with a new one.
     
  2. Inspect Electrical Connections: Check all electrical connections related to the fuel system, including the wiring from the fuel selector switch to the engine control unit. Clean and tighten any loose or corroded connections.
     

4. Engine Control Module (ECM) Malfunction
The ECM is responsible for managing the engine’s fuel system, including switching between gasoline and LP gas. A malfunctioning ECM can fail to detect the LP gas system or fail to activate it correctly.

• Possible Causes:
  
  1. Faulty ECM Software or Settings: The software or settings within the ECM may not be correctly configured for the LP gas system.
     
  2. Electrical Issues: A fault in the ECM wiring or power supply could cause it to malfunction, preventing the LP side from functioning.
     
• Troubleshooting Solutions:
  
  1. Check for ECM Errors: Use a diagnostic tool to check for any error codes in the ECM related to the LP gas system.
     
  2. Reprogram or Replace the ECM: If the ECM is faulty, it may need to be reprogrammed or replaced with a new unit.
     

5. Clogged or Dirty LP Gas Lines
Over time, the LP gas lines can become clogged with dirt, debris, or old fuel residue. This can prevent LP gas from reaching the engine and lead to issues with the power-up process.

• Possible Causes:
  
  1. Contaminated Fuel Lines: Old or contaminated fuel can clog the lines and restrict the flow of LP gas.
     
  2. Bends or Kinks in the Lines: Sharp bends or kinks in the fuel lines can restrict gas flow and cause performance issues.
     
• Troubleshooting Solutions:
  
  1. Inspect the Fuel Lines: Check the LP gas lines for any visible signs of clogging or damage. If there is debris or residue in the lines, clean or replace them as needed.
     
  2. Check for Kinks: Ensure the fuel lines are free of bends or kinks that could restrict gas flow. Straighten or replace any damaged lines.
     

Preventive Measures to Avoid Future Fuel System Issues
To minimize the risk of encountering problems with the LP fuel system on the Genie TMZ 50, consider these preventive maintenance tips:

1. Regularly Inspect the Fuel System: Perform regular inspections of the LP gas regulator, fuel lines, and tank to ensure they are clean, undamaged, and functioning properly.
   
2. Maintain Clean Fuel: Ensure that the LP gas used is clean and free of contaminants that could clog the system.
   
3. Check Electrical Connections: Regularly inspect all electrical components related to the fuel system, including the fuel selector switch and ECM, to ensure they are functioning properly.
   
4. Service the System Periodically: Schedule periodic maintenance for the entire bi-fuel system to keep it in top condition, including replacing any worn-out components.
   

Conclusion
The Genie TMZ 50 Bi-Fuel is an excellent machine, but like any piece of heavy equipment, it can experience issues with the fuel system. If the gasoline side powers up while the LP side does not, it’s important to troubleshoot the LP regulator, fuel tank, electrical system, and other components of the bi-fuel system to identify and resolve the problem. With proper maintenance and timely repairs, operators can ensure that their Genie TMZ 50 continues to function efficiently and reliably.