Generator Will Not Start on Propane – Troubleshooting Guide

If your generator will not start when using propane, follow the steps below to identify and resolve the most common causes.

⚠ Safety Notice:
Do not operate the generator if you smell propane or fuel before startup, as this may indicate a leak.

Step 1: Confirm Proper Startup Procedure

Make sure the generator is being started using the correct propane startup procedure.

(CLICK HERE) To Review Start up Procedures if needed

Step 2: Verify Battery Connection

Generators are shipped with the negative battery terminal disconnected for safety during shipping.

Confirm the battery is properly connected before attempting to start the generator.

(CLICK HERE) On instructions how to connect battery if needed

Step 3: Confirm Propane Tank Has Fuel

Ensure your propane tank contains enough propane to start the generator.

For best performance, we recommend using a 40 lb propane tank.
A 20 lb tank may still be used for startup and lighter electrical loads.

Common propane tank sizes include:

• 20 lb

• 30 lb

• 40 lb

• 50 lb

• 60 lb

• 100 lb

Larger tanks typically provide more consistent fuel pressure for generator operation.

Step 4: Test the Battery Voltage

If using the push-button start, check the battery voltage.

Recommended readings:

• 13.5 volts when not under load

• 11.5 – 12 volts under load

Recharge or replace the battery if the voltage is too low.

Step 5: Check the Choke Position

Verify the choke is set correctly during startup.

Note: EH series generators use a manual choke.

Improper choke positioning may prevent the engine from starting.

Step 6: Allow Propane System to Prime

After opening the propane tank valve, allow 2–3 minutes before starting the generator.

This allows propane to fill the hose and purge air from the fuel lines.

Step 7: Inspect for Propane Leaks

Check the propane hose and connections for any leaks.

You can perform a smell test near the following components:

• Propane hose

• 2nd stage regulator (located near the carburetor and air filter)

If propane odor is detected near these areas, a component may be leaking.

Step 8: Check for Propane Smell at the Exhaust

If you notice a strong propane smell at the exhaust before startup, the propane hose may be faulty and may need replacement.

Step 9: Inspect the Spark Plug

Remove and inspect the spark plug.

Replace the spark plug if it shows signs of:

• Damage

• Weak spark

• Excessive wear

For best results, replace with the recommended NGK spark plug for your specific generator model.

Potential Parts That May Require Replacement

Based on the symptoms observed during troubleshooting, one or more of the following parts may require replacement.

1st Stage Regulator

Replace the first stage regulator if:

• Propane is leaking from the hose

• The hose appears cracked or damaged

2nd Stage Regulator

Replace the second stage regulator if propane odor is coming from the regulator area near the carburetor.

Spark Plug

Replace the spark plug if:

• The plug produces weak or no spark

• The plug is heavily worn

• The generator is still using the original OEM spark plug

Use the NGK spark plug recommended for your generator model.

Generator Will Not Start on Any Fuel Source

If the generator will not start on gasoline, propane, or natural gas, check the following:

1. Inspect the electric start system

2. Confirm the generator attempts to crank

3. Check for spark

4. Verify the engine oil level

5. Look for any sensor or warning lights on the control panel

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✅ Support Tip:
Many propane starting issues are caused by air in the propane line. Waiting 2–3 minutes after opening the tank valve allows the fuel system to fully prime before starting.