i've never had a pump go bad on a bike. But i did have one go bad in my car and it wouldn't run at all. What are the problems you are having. I'm guessing that if it goes bad it just stops working period.
My bike still runs, but every once in a while it feels like there's an interruption in the fuel flow or something (it lurches a little bit like it momentarily lost power.
The tach also goes to 8000 (no matter the RPM) on a regular basis every 5 seconds. I know this is a self diagnostic thing on my Yamaha, and that it's indicating something wrong with the fuel pump, fuel sender (whatever that is), fuel indicator light, or wiring between all those systems.