Walt1967 Posted July 25, 2015 Share Posted July 25, 2015 Hi everyone I have a fuel filter question.91 mack superliner has a 425 cat. Primary fuel /water separator filter did not have a drain valve on it,neither did secondary fuel filter have one when I bought truck.mack dealer sells water/separator filters as does fleetpride without drain valve.i did find a luberfiner filter that did have a drain valve on it.my question is where does water go if you don't have drain valve.is the filter split so water can drain down? Which is the better filter? Quote Link to comment Share on other sites More sharing options...
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