The gas tank has to be fully closed for this weedeater to work correctly.(pressurized system)  I got a gas tank from a t-50 hedgetrimmer from ukraine.(works fantastic)  I tryed rubber coating and epoxies, all are no good.  Keep a check on ebay for a t-50 model tank.  Yes it has to be that exact model.
                 Joe
                
 August 2017