Generac — Test the PAS (Positive Air Shutdown)
Testing & diagnosis · Positive Air Shutdown valve
From a Generac owner's manual — check it applies to your exact model before use.
Applies to: Generac MLT, Mitsubishi L2E engine
Before you start
- Contact Generac Mobile Technical Support if valve does not close
Procedure
- Verify valve is open before testing.
- Pull the T-handle, or press the emergency stop button, to trigger the actuator.
- Confirm valve closed by verifying knob rotated perpendicular to pipe centerline.
Specs & values
- Test at least once a month
Full service-parts list: Generac MLT →
Source: Generac owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.