I don't think all Fords/Lehmans are plumbed the same. Last one I had in my shop for a rebuild I bench ran it and if I remember right it had a fair amount of return flow.
It's normal practice in the diesel world to have a drilled orifice or pressure control valve from injector pump to return. If you don't have that, it will not naturally purge air and can lead to stalling. On other engines like that (Yanmar GM) I have custom made a bleed rig to the return to get rid of the air problem.
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