First thing on any diesel really is a good well flowing fuel filter and is overlooked when people start throwing pumps and injectors at cars with probs, especially TDCI Fords!

Once your fuel filter is full I never advise cranking over TDCIs with any fuel pipes open, be it low or hi pressure, as it introduces air in the system. 'cracking off' the high pressure pipes like you can on old skool engines does not work on these.

You really need a hand primer inline with filter> pump to prime the system initially.

But if the guy uses one then it wo'nt run again after being stood overnight, you have other issues as said above.