NBZ

Thanks for your input.

I have not replaced the fuel pump relay yet.
I know the pump works and pressurizes the fuel rail (I can hear it working)and I have measured the fuel pressure after just turning the key on. My analysis (right or wrong) is that the car is flooding in the morning when I first try to start it normally and by removing the fuel pump fuse temporarily it allows the engine to eject the fuel and start. Which happens quite quickly after removing the fuse. I am certainly not an expert but it seems to me that even if the fuel rail is pressurized the injection sequence controlled by the computer should not allow the engine to flood. Which seems to imply the computer is seeing false signal and giving the wrong sequence. Hence my efforts to measure all the sensors that impact the injection timing. Yet by simply removing the fuse the whole timing issue gets resolved?
I have reviewed the wiring diagram and removing the fuse only deprives the fuel pump of current when the computer calls for it. It is hard to understand why this action resolves anything but starving the fuel rail and injectors of fuel, yet why does the computer push more fuel into the cylinder?

Maybe the lack of current to the pump inadvertently resets the computer and impacts the injection sequence. It seems to me this is quite a long shot however I have virtually exhausted my options.... So I have bought a relay from the dealer and will install it tomorrow morning if the car does not start after all the efforts put in today.

I will post the results tomorrow.

Thanks again

David