L5P injectors require back pressure to operate?

[Ron Nielson]

For LML injectors:
The injectors require a minimum of 3 BAR (45 psi) of pressure in the return system. Pressure is maintained via a “Constant Pressure Regulator” at 4-11 BAR (58-160 PSI).

Is the same true for L5P injectors?

 

[2004LB7]

I believe that is only applicable to piezoelectric injectors. L5P uses solenoid