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Fuel pump check valve.
The regulator itself.
Typically injectors do not leak down fast enough to create the symptoms you describe (immediate drop to 0 pressure).
Next time try clamping the supply and return lines off when you shut it down with pressure in the rail. If it holds pressure then suspect the fuel pump check valve, which you have isolated. If not the suspect the regulator itself dumping fuel into the vacuum supply line when then goes into the manifold.Disconnect the line and smell it for fuel smell (bad regulator diaphragm).
If the regulator is the culprit then change the oil since you will probably have it contaminated with fuel. I've seen them so bad you could light the dipstick on fire due to the fuel in the oil, also just smell the dipstick to see if you can detect fuel smell.
regards
Mech
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