fresh rebuild but wont start
 

just had a fresh rebuild done on my 1993 ssxi 750 and it cranks but will not fire, checked for spark boths spark great, not seeing fuel going into the carb, took it apart, cleaned the jets and lines with carb cleaner put it back together and still no fuel and nothing coming out of the return line when cranking. any idea's on what i should do next?
thanks,
Dan