The fuel pump I ordered was mistimed which means the inlet went into a chamber with two outlets. I adjusted it correctly by removing the front and rotating it clockwise one position to line up with the arrows on the back. It still doesn't pump gas though. When I took it apart I noticed that it also has a button and spring on top. Not sure if it has anything to do with it not working as I've found that the Mikuni pump repair videos don't show anything about the button and spring over the diaphragm.
GOOFIT PD18 18Mm Carburetor For 4-Stroke GY6 49Cc 50Cc Chinese Scooter 139QMB Moped Replacement - Taotao Kymco Jonway Baja
19 Review
Restore Your Diesel Engine Performance With Archoil AR6400-D Fuel System Cleaner
31 Review
Hy-Per Fuel Complete Gas System Cleaner By Rislone
24 Review
Lucas Oil Fuel Treatment Quart - Tan Color, 1QT Size
31 Review