Fuel Selector Switch Bypass Test – Troubleshooting Procedure

This procedure helps determine whether the fuel selector switch is preventing fuel from reaching the engine.
By temporarily bypassing the selector switch, fuel will flow directly from the fuel line to the fuel valve, allowing you to confirm whether the selector switch is faulty.

⚠ Important Safety Notice:
Only perform this test with the generator turned OFF, in a well-ventilated area, and away from any open flames or sparks.

Step 1: Locate the Fuel Selector Switch and Fuel Valve

Locate the fuel selector switch assembly and the fuel valve on the generator.

You will see fuel hoses connected to the selector switch and fuel valve.

In the reference image:

• Point B – Fuel line connected to the fuel selector switch

• Point A – Fuel line connected to the right side of the fuel valve

Step 2: Disconnect the Fuel Line from the Fuel Selector Switch

Remove the fuel hose connected to the fuel selector switch at Point B.

This hose normally carries fuel from the selector switch to the fuel valve.

Step 3: Disconnect the Existing Hose from the Fuel Valve

Locate the hose currently attached to the right side of the fuel valve (Point A).

Disconnect this hose from the fuel valve.

Step 4: Connect the Selector Switch Hose Directly to the Fuel Valve

Take the hose you removed from the fuel selector switch (Point B) and connect it directly to the right side of the fuel valve (Point A).

This reroutes the fuel line so that fuel flows directly to the fuel valve, bypassing the fuel selector switch.

Step 5: Test the Generator

After reconnecting the hose:

1. Turn on the fuel supply.

2. Attempt to start the generator.

Test Results

If the generator starts and runs normally:
The fuel selector switch may be faulty or internally blocked and may need replacement.

If the generator still does not start:
The issue is likely not related to the fuel selector switch, and further troubleshooting may be required.

After Completing the Test

Once testing is complete:

• Return all fuel hoses to their original configuration

• Ensure all fuel lines are securely connected

• Check for any fuel leaks before restarting the generator

Potential Part Replacement

If the bypass test confirms the issue, the following part may require replacement:

Fuel Selector Switch

Replace the fuel selector switch if:

• The generator runs normally when the switch is bypassed

• The selector switch does not properly route fuel between fuel sources

• The selector switch is physically damaged or blocked internally

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✅ Support Tip:
A faulty fuel selector switch can restrict or block fuel flow, preventing the engine from starting even when fuel is present in the tank. Performing this bypass test helps confirm whether the selector switch is the cause.