If it is doing it with the trigger pulled that means your tip is too small or the bypass orface is too large. Is this a new unloader you bought and put on or is it a problem that just started? If it is one you just put on you probobly have the wrong orfaces in the new one. You can take the parts off of your old one and put them on the new one.
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Hotwaterwizard@aol.com If You have a problem with your machine, just ask me for help. Check out the Machine Problem Board