My previous engine
turned out to have a defective mechanical lift
pump (among many other problems) and yes, it would not start at all if not bled right through.
I installed a small electric pump
(probably designed for petrol) that failed in short order.
I took it back and got another one that was the same.
This time I replaced the lift
pump and wired the electric
one in for bleeding and emergencies. It has one way valves so fuel
flows through if it is not running.
Makes bleeding a breeze. Just turn on and loosen/tighten a few nuts.