Well you say it runs fine....but it cut out twice yesterday with a fuel system fault code... 
When the pumps start to fail, they can't keep up with the high fuel demand at higher load, so it might run fine at idle or cruising, but that doesn't mean the pump is good.
Good luck for tomorrow.

When the pumps start to fail, they can't keep up with the high fuel demand at higher load, so it might run fine at idle or cruising, but that doesn't mean the pump is good.
Good luck for tomorrow.