if it's a fuel issue, it won't be the jetting since the bike ran well prior. it would have to be something really went bad in the carb
, ripped rubber diaphragm, extremely leaky coaster enrichener, I would think something quite obvious. If it's pump related, tested on a battery only, shows the pump working or not. The circuitry of the pump goes thru the relay and the ignition module, if something were up with either one of those, then the pump would not turn on.
power to the relay which turns on the pump starts at the fuse block of R/w goes thru kill switch comes out R/B (looks like a "B" ) R/B goes thru relay coil exits out as L/R and goes right to ignition module, somewhere in there (ignition module) it has to reach ground,or the relay coil will not energize and therefore no 12v would get to the pump. L/B would have the 12v positive to pump.
Now, as far as the pump, does it always stay on? or is there an internal pressure switch to interrupt the 12v to turn it on/off?? I don't know.
So as far as the fuel flow and the pump doing what it needs to do, it could be anyone of those 3 that could cause the pump not to work on the bike. And there is no way to test that I know of, other than to swap each one with a good known one.
If you are using a Dyna3k, I know there had been issues with fuel pump failure. I don't know if it was an out of the box failure or a gradual fail. But this is also going back more than 5yrs ago.