Could be the fuel pressure sensor on the rail is faulty but this normally throws up a fault code. Check brown/green wire and earth there should be 5v at it with Ignition on.
Also check the resistance of Fuel pressure regulator control solenoid on the high pressure fuel pump. Check solenoid when disconnected yellow/red and grey/violet this should be 3.6 ohms.
Don't know if you can get the fuel pressure checked anywhere, as a last resort you could try cracking one of the injector pipes and crank engine, it should squirt out with a bit of force if it just dribbles it could be high pressure fuel pump problem.
Also check the resistance of Fuel pressure regulator control solenoid on the high pressure fuel pump. Check solenoid when disconnected yellow/red and grey/violet this should be 3.6 ohms.
Don't know if you can get the fuel pressure checked anywhere, as a last resort you could try cracking one of the injector pipes and crank engine, it should squirt out with a bit of force if it just dribbles it could be high pressure fuel pump problem.
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