7.3 IDI (and 6.9) has two check-valves factory installed in the fuel system to prevent drain-back and hard cold starting.
1. is what you are calling a "check valve" that screws into the top of the injection pump. It prevents fuel drain back and also regulates internal pump housing pressure at 6 PSI. Stanadyne calls the part a "housing regulator valve."
2. the check valves in the mechanical fuel pump that feeds the injection pump.
Besides these two check-valve systems, Ford also use the Schrader-valve that can cause air leaks in the fuel - but as I recall that's only with the older trucks with the pair of round fuel filters (primary and secondary).
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