If the seal on the top of the keg is cracked, cut, torn,etc., this will allow the pressure to flow into the beer stream and cause foam. This unfortunately is not uncommom. If this is the case and you have not dispensed to much beer, try to take it back for credit. As to pressure, use an accurate thermometer to check beer temperature and if you are at sea level and temperature is 38 degrees F, your pressure should be around 14 PSIG if it is a domestic beer. 16 if it is a Coors Brewing CO. product. Adjust up one pound for 40 degrees, down one pound for 36 degrees.
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