the other day i ended up on side of the road. Bikes been running superbly then bamm was like i ran out of gas. I suspected the fuel pump. Bike started and limped home but only with alittle coke applied to keep from dying. I took pump off and ran it with hoses disconnected and im getting suction and discharge. Im baffled. Made it around the block today with horrible power and some backfiring. then died again and wont restart. Does a fuel pump soley prime carbs and then vaccumm take over or does the fuel pump work the whole time bike is running?