MF 50B feul problem

Check the constant bleed orifice fitting on top of the filter base, if it's plugged will cause your problem. Air gets to the injection pump instead of going out the orifice as it should. Also if NAPA/WIX filters are used DO NOT put an extra O ring in the filter top outer groove, that's the fuel inlet. It must not be restricted/ blocked. Common mistake on these filters..
 

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