Where to start..

Woke up one morning and headed to the car ( done a 4 hour journey the night before) and the car would crank but not turn over.The cars electrics is in perfect working order i'm a bit puzzled as to why this has randomly done this.

The car will start with easy start fluid but not for long until it dies again.

Things i have done so far :

1. Replaced the battery
2. Replaced the fuel Pump
3. New spark plugs
4. Fuel Injection cleaner

It seems like there is no fuel pressure now :S

Any help would be much appreciated

Thanks

Max