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if you haven't already then replace the fuel filter as the next step and if that doesn't help then its possible the high pressure pump, is faulty
before replacing the pump thoiugh 1st check that pump solenoid wiring connection is clean and not corroded and the wiring to the solenoid is also undamaged, as if this is shorting out then you'll lose fuel pressure
the pump is located on the LH cam cover , I'd suggest the best way to locate the pump is to find the fuel injectors on the cylinder head which are in the middle of the chamber next to the spark plugs
so I 'd sugges the next step is to remove the plastic engine cover and then the coil covers in the middle of the cam covers and then follow the fuel rail high pressure pipework back to the pump
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