Fuel problem

Recently replaced the timing belt due to it being shredded from a faulty timing tensioner. after everything the car started, ran really rough then died out like it was having a fuel issue. after a fuel pressure test i noticed that the pressure was not holding in the lines and that it appears all the injectors are stuck open and dumping fuel into the engine causing it to be too flooded to start. So my question is now, what would cause all the injectors to just stay open?? (truck has a new fuel pump, filter and also a replaced ECM due to me thinking this was the problem before finding out about

– Fuel problem

Fuel Problem

The engine cranks but does not appear to get fuel. I replaced the fuel pump relay and the fuel pump was replaced 4 years ago. I assume the fuel pump went bad but was wondering what else I might check before dropping the gas tank or paying someone to do this.

Thank you

– Fuel Problem