I am able to start engines normally on Boeing 747 without turning any fuel pumps on. I have already logged a Zendesk case for this, however I was curious to know if anyone else had experienced this behavior in the 747 or any other aircraft?
It’s not a bug. Basically all airliners can be gravity fed if the tanks are full. The pumps are only providing a regulated pressure during all stages of flight and to enable x-feed.
not a bug, normal gravity operations on full tanks
Thank you both for the response - I will remove my Zendesk ticket.
Follow-up question: Is there any situation where you wouldn’t turn the fuel pumps on in normal operation?
In case of a fire If still on the ground… run Forrest… run away!