Advice on possible faulty D5 Fuel Pump

[lpg224kw]

Hi

Advice sought re the following
car V70 D5 2002
symptoms

1. Occasional engine cut out, typically when pulling away from standstill or when moving slowly, engine having been at low load. "Urgent Engine Service" warning produced. Turning the ignition off and then back on again has always got the car going again.
2. Erratic low load throttle response. Most clearly demonstrated when steadily opening the throttle with the car in neutral, throttle response is non linear, i.e. the revs jump up in big steps and then remain stationary or even fall back. Happens most around 1500 rpm, with the revs jumping in a 500 rpm step upto 2000 rpm. On closing the throttle, the behaviour is reversed with the revs hanging then jumping down. A plot of throttle position and revs against time would not look pretty.
3. When trundelling along at 40 mph in top gear the engine occaionally apppears to pulse at a frequency of ~0.5 - 1 Hz as if the throttle was being repeatedly opened a bit then closed a bit, although of course the right foot is staying put. (because I'm trundelling along...) Mway driving appears fine at the moment


The cut out behaviour has suddenly got more frequent. Visit to main dealer for diagnostic test returned error codes ecm 2505 fuel pressure too low and ecm 2503 fuel pressure fault. Dealer checked pres sensor, filter injectors and pipework but could find no faults. they diagnose faulty fuel pump thats £1780 fitted to you sir.

my sentiments on the matter would not last long on a well moderated forum.

any advice/recommendations would be greatfully received, particularly on the probability of correct diagnosis and where to get the fuel pump (low /high pressure + fuel pressure regulator, is this a Volvo only part?)

also Main dealer has said that the ECU needs are program if an elctromechanical part such as the FP is fitted... Really??