1991-1993 Yamaha Exciter II-570 Service Manual, Page 154Get this manual
4Inspect: Fuel hose CD Fuel delivery hoses Pulser hose ClogDamage -)- Replace
5Check: Fuel pump operation Checking steps: Connect hand-operated vacuum pump CD (Such as Mighty to the pulser hose Place receptacle under the fuel delivery hoses end Opetate the hand-operated vacuum pump CD (Such as Mighty when checking the fuel flow from the fuel delivery hoses If fuel does not flow out, check the fuel cock If no defects are observed on the fuel cock, replace the fuel pump assembly To replace the fuel pump assembly, perform the following steps from to 7