Vauxhall astra - Vauxhall astra fuel pump - taz1985

I have a Vauxhall astra active 1.6 8v petrol it is giving me the code p0320 which is fuel pump it has been in garage for past week but they can't find the problem they have checked the fuel pump and say it's fine the have changed the fuel pump relay but it is still giving off this code and they say they have no idea why has anyone else had this problem if so what is it and how do I solve it .

Vauxhall astra - Vauxhall astra fuel pump - elekie&a/c doctor

What age is the car?Also what is the problem?Does the car run?

Vauxhall astra - Vauxhall astra fuel pump - taz1985

It is a 2003 the car runs perfect it's just start up I have to give it some acceleration while turning key to get it to start.

Vauxhall astra - Vauxhall astra fuel pump - taz1985

Sorry the code is p0230.