If the pressure just shoots through the regulator,the primary valve assembly is shot. The valve is right where the gas goes into the regulator. There are 2 screws holding the valve in. Remove the screws and the valve pulls right out. You can replace just that valve. See if your LP dealer can order one for you. Just tell him you need a primary valve assembly for the M5. Just reinstall the new one. It's not adjustable. Just make sure the primary lever is properly oriented when you put it in. You'll see what I mean when you put it in.
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