Fuel pump noise?

[Ben70_imp]

The "priming" noise my fuel pump has always made with key on during the gauge sweep has changed, after riding a ways, to a louder and more shrill noise when restarting a warm engine after, say, a fuel stop. If I go out in the garage and try it cold, it's normal. Any ideas? I have about 3000 miles on it.
It doesn't seem to continue after startup that I can hear, anyway. I plan to keep riding and just see what happens, especially if nobody else has noticed this. Thanks

Ben