Quote Originally Posted by mmandley View Post
Rail pressure at start up is 50-60 but the regulator doesn't do anything until the engine starts.

Fuel pump charges the line, then shuts off.
Once Started Fuel pump kicks on, and then Regulator Regulates.

If you charge the fuel line and then let the fuel out of the line with the valve, the pressure does not return...Until you cycle the key on and off again

If you have the engine running and press the valve the fuel pressure does not drop, because the regulator allows more fuel through it.
So the pressure should drop to thirty when engine starts?...if the regulator is bad then would to much pressure to the injectors cause the motor to shut down?