the switch to ULSD & biodiesel will eventually lead to pump leakage if the pump was never re-sealed. pumps after '96-ish should have the correct seals to accomodate the new fuels.
the pump should last nearly forever if you change your fuel filter every 6 months or at least a year. but that doesn't mean the pump won't run like crap after a while... if the feed pump gets worn out, you can always use a lift pump to squeeze extra miles from it.