HOW TO: Testing a Power Valve

This video briefly explains the purpose and function a power valve, what happens when one fails or "blows out" and how to test a valve to determine viability.

The power valve and the power enrichment circuit are critical parts of any carburetion system to allow for proper fuel delivery at wide open throttle or very significant open throttle positions.

Being a vacuum operated device, that controls fuel flow, it is critical that a power valve be able to maintain vacuum pressure and operate with a leak-free diaphragm.

A failed power valve will lead to unmetered fuel entering the throat of the carburetor, makes tuning impossible and the extremely rich running engine will also suffer from poor performance, acceleration and gas mileage.

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