Quote Originally Posted by bambino View Post
the pump for the returnless fuel systems are designed to stand let's say constant 55-64psi ( GM 4.3L VORTEC ENGINES)

so i don't think it's a concern at all

unless there really was a problem on the injectors in the first place
The concern is the fuel system might be rated for 55psi but that is flowing, not static pressure which can induce higher stress to the pump itself.