In a world of pulling mags at 500 hours and turbos that last 1000, fuel pumps are a breath of reliability fresh air. So reliable, in fact, that it’s much more common for a pilot to have an engine stoppage because the pilot does not know the aircraft’s fuel system or misuses the boost/aux pump than because a pump fails.
Pumps for moving liquids have been around for centuries, so one would expect the design and manufacture of such relatively simple devices to have been sorted out.