Shonky ofab/c mgmt!!! Now you know why I won't touch a car fitted with it!!!

On a serious note if you are running with the std fiesta turbo fuel pump then raising the fuel pressure can cause the pump seals to fail resulting in loss of fuel flow and melted engine.

This is more the fault of the pump than the person seting the car up, but only experience can help a tuner to know about this pump problem.