Citroen Saxo fuel pump issue or something else?

freshpopcorn

Hi!
Posting here for somebody who owns a Citroen Saxo.
A few weeks ago the car had no issue but was getting a minor job done at the mechanics.
The owner was present and the mechanic stalled the car when the job was done. The Car then refused to start this was due to the him puting his foot down on the accelerator to soon.
He then pressed a red button under to bonnet called the fuel cut off button. It started then.
The next day the car stopped dead whilst driving in a car park. When you turned the ignition it sound like it was failing to get petrol. After a while it started again.
They brought it to the mechanic who said it was the fuel pump. They sourced a second hand one and the car still has the same issue now.
It will start no problem from cold but after a time it stops dead after a short enough drive.
Anybody have any idea what it may be?

freshpopcorn

Sorry if I wasn't clear in the OP.
If he need anymore details just ask.
Thanks!