I swear I saw another post where he said the regulator was good. So I would check for blockage in the return line.
Why wouldn't the injectors fire if the pressure is too high? The light lights up but no fuel comes out? Wouldn't an abundant amount of fuel come out? I guess it's possible the blockage is somewhere else?
2008 Mercury Sable Premier
2014 Ford Focus Electric
1997 Mercury Grand Marquis GS
Moved On: 2000 Sable LS Premium Duratec
If the pressure is too high, the magnetic force from the solenoid coil is insufficient to overcome the force on the plunger from the pressure. So the injector stays closed. Since fuel injectors are designed to deliver a precise amount of fuel, they are designed to operate with a specific pressure drop across the fuel injector. In the case of a Ford injector, the ideal pressure drop is 270 kPa.