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Have you cleaned the strainer/screen in the cap on the fuel pump? The best bet is to just rebuild the pump and replace the fuel lines then your ready to rebuild the carb if necessary. Be real careful pulling the pump apart and take pics as there are several different ways to put it back together wrong.
http://www.ebay.com/itm/New-Fuel-Pu...088-/271927178307?hash=item3f501f7443&vxp=mtr