Tinkling/ticking engine noise when idling

Hey, I having trouble locating the source of a tinkling/ticking noise coming from my engine, but I only when the engine is hot and only during idle and up to around 1,300 rpm's after that the noise stops. I have a video where you can hear it, if you have any idea where to start looking I would be grateful. I have been told it could be the injectors or fuel pump as they are meant to to be noisy on these engines.