Fuel pressure regulator issues :(

[tom-dturb]

Hi all car was cutting out under hard acceleration, changed the fuel pressure Regulator, all was fine for a day. Now the car will run for a day then splutter, cut out, only rev upto 2.4k and over run. To cure the problem I remove the regulator and reinstall. Again all is ok for a few hours. I'm thinking either the o-rings on the regulator are worn or the old regulator did have a flat end with a hole, the new has a point, would this cause an issue?