Hi new to the forum and new car but having some issues

I need to replace the fuel return pipe but i cannot get the pipe split from the front of the engine. It looks the same as a fuel filter type fitting but it wont come away. Could someone tell me how it comes off as i have tried all ways but cannot get it to shift

here is the pic, its the white connector, please help cos im looking at the cutting gear fondly lol

 

well known for braking, as i know the connectors you haved to nip the sides in pulling apart at the same time, your connector does not look like so,
if its pos for you do away with the conntor or even ues a new one, if yours brake.