Troubleshooting Your RV Generator: Part 1 - Fixing Start-up Issues

Table of Contents

1. Introduction
2. Checking Battery Power
3. Ensuring Fuel Supply
   1. Overview of Fuel System
   2. Checking Fuel Level
   3. Verifying Fuel Flow
4. Checking Spark
   1. Removing Spark Plug
   2. Inspecting and Adjusting Gap
   3. Testing Spark
5. Air Filter Inspection
6. Conclusion

Reasons Why Your RV Generator Might Not Start

Hello again, fellow RV enthusiasts! Richie from RV Know-How here. Today, I'd like to discuss a few possible reasons why your RV generator might refuse to start. By going through a checklist of essential factors such as battery power, fuel supply, spark, and air filter condition, we can troubleshoot and identify the problem. So, let's dive right in and get your generator up and running!

1. Checking Battery Power

When experiencing trouble starting your RV generator, the first thing to check is the battery power. Using a multimeter, measure the voltage of the batteries to ensure they have at least 12.6 to 12.5 volts. It's important to note that this voltage may be higher if your RV is plugged into shore power or if the motor is running and charging the batteries. Confirming sufficient battery power is crucial before proceeding with further troubleshooting steps.

Pros:

• Easy to check with a multimeter
• Provides insight into the generator's power source

Cons:

• Insufficient battery power may require additional charging or replacement

2. Ensuring Fuel Supply

Assuming the battery power is sufficient, the next step is to investigate the fuel supply. RVs typically share a fuel system that powers both the engine and the generator. To determine if you have enough fuel, check the fuel level indicator on the dashboard. A quarter tank is usually the minimum required for the generator to operate correctly. If the fuel is low, you must top it up to at least half a tank to ensure a continuous supply.

Pros:

• Quick check to verify fuel level
• Prevents generator from running out of fuel during use

Cons:

• Low fuel level limits generator usage

2.1 Overview of Fuel System

Understanding the layout of the fuel system is essential for troubleshooting. In most cases, the fuel tank is located under the RV, and there are two pipes connected to it. One pipe extends closer to the bottom, while the other stops about a quarter tank higher. This design prevents the generator from consuming the remaining fuel, ensuring ample supply for traveling to the nearest gas station.

2.2 Checking Fuel Level

To confirm that fuel is reaching the generator, you can perform a simple test. Disconnect the fuel pipe and place it into a suitable container capable of holding gasoline. This container should be made of plastic and specifically designed for fuel storage. By pressing the prime button, the fuel pump should start, causing fuel to flow from the pipe into the container. If fuel is present, we can conclude that the fuel supply is reaching the carburetor without obstruction.

Pros:

• Easy test to perform
• Provides visual confirmation of fuel flow

Cons:

• Requires caution to avoid fuel spills
• Possible fuel line obstructions require further investigation

2.3 Checking Spark

If the generator is still not starting, the next step is to check for a spark. The spark is crucial for igniting the fuel mixture and starting the engine. To access the spark plug, remove the high tension (HT) lead. Inspect the spark plug for any damage and ensure that the electrode is intact. Additionally, check the spark plug gap using a feeler gauge. For gasoline models like the Onan 4000, the gap should be set to 0.025 inches (25,000 of an inch). Adjust the gap if necessary to ensure proper functioning.

Pros:

• Identifies potential issues with the spark plug
• Allows for adjustment of the spark plug gap

Cons:

• Potential damage to the spark plug during removal
• Requires a feeler gauge for accurate adjustment

2.3.1 Removing Spark Plug

To remove the spark plug, carefully detach the HT lead and unscrew the plug using a spark plug socket. It is crucial to apply gentle force to avoid damaging the plug or the engine.

2.3.2 Inspecting and Adjusting Gap

Once the plug is removed, inspect it for any signs of damage. Ensure that the electrode is intact and visually check its color, which should indicate its condition. Use a feeler gauge to measure the gap between the center and side electrode. Adjust the gap as necessary to match the manufacturer's specifications.

2.3.3 Testing Spark

To check for a spark, reattach the spark plug to the HT lead without inserting it into the engine. Using a pair of insulated pliers, hold the plug close to a grounded metal surface. Press the start button and observe the spark. A visible spark indicates that the spark plug is functioning correctly.

Pros:

• Provides visual confirmation of spark generation
• Allows for on-the-spot adjustments to ensure proper spark

Cons:

• Requires caution and insulated tools to prevent electric shocks

5. Air Filter Inspection

In addition to battery power, fuel supply, and spark, it's important to inspect the air filter to ensure it is not clogged or obstructed. Locate the air filter by removing the cover, held in place by wing nuts. Check for any debris, leaves, or signs of blockage. If necessary, clean or replace the air filter to maintain proper airflow and optimize generator performance.

Pros:

• Maintains efficient airflow for optimal generator performance
• Frees the engine from potential damage caused by debris

Cons:

• Requires periodic inspection and maintenance

6. Conclusion

By following these troubleshooting steps, you should be able to identify and resolve the issues preventing your RV generator from starting. Remember to check the battery power, ensure an adequate fuel supply, check for a spark, and inspect the air filter. Regular maintenance and proper troubleshooting techniques will help keep your generator running smoothly and ensure a stress-free RV journey.

Highlights

• Insufficient battery power can prevent the RV generator from starting. Check battery voltage to ensure at least 12.6 to 12.5 volts.
• Fuel supply is crucial for generator operation. Maintain at least a quarter tank of fuel.
• Perform a simple test to check fuel flow from the tank to the carburetor.
• Verify the spark by inspecting the spark plug, adjusting the gap if necessary, and visually confirming the spark.
• Keep the air filter clean and free of debris to maintain proper airflow and generator performance.

FAQ

Q: Why is battery power important for the RV generator to start? A: The battery supplies the initial power needed to start the generator's engine. Insufficient battery power can prevent the generator from cranking and starting.

Q: What happens if the fuel supply is low? A: If the fuel level is below a quarter tank, the generator may not start or run properly. It is essential to maintain an adequate fuel supply for uninterrupted generator operation.

Q: How can I check for a spark in the generator? A: To check for a spark, remove the spark plug, inspect it for damage, adjust the gap if needed, reattach it to the HT lead, and hold it close to a grounded metal surface while pressing the start button. A visible spark confirms proper spark generation.

Q: How often should I inspect the air filter? A: The air filter should be regularly inspected to ensure it is not clogged or obstructed. Maintenance intervals may vary, but a visual inspection every few months is recommended.