the pierburg 2e3 (sierra cvh carb) shuold be fitted with a return line you dont need the seperator just a t pice with a restristion on the return side (old carb jet screwed in)
if you have no return line you will get one of two problems the float will hold back the pressure and the fuel pump will not follow the cam damaging it
or the float will get pushed down changing your fuel hight in the float chamber
also worth thinking about vapor lock in hot weather
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