747 jock
Why would you want to fly until the helicopter ran out of fuel? By doing this, a damaged fuel pump may well be the least of your problems.
He didn't say he wants to. There are some pilots that would like to know at which point on the fuel gauge the fuel runs out…
This can be done safely in a low hover. Not recommended though but do able none the less.
Personally if the fuel light is on I tend to go on time, but it would be nice to know when the gauge is reading zero the engine is still running in straight and level.
It probably would not damage the injectors though because the engine would stop. If that happens switch the boost pump off!