Engine Mechanical problem
2004 Other Citroen Models Two Wheel Drive Manual

I have a picasso

recently i had a new low pressure fuel pump installed but i have been having problems with the car since.

the day i got it back i turned off the ignition took the key out then 5 seconds later the engine stopped running
The fault code keeps coming up for the pump
Im getting ghost fuel readings.

in your experience am i having these problems due to the garage not replacing the pump properly is it more likely to be another problem?