Noise between 2000/3000RPM and only in 1st gear

Hi,



I rarely push hard my car (Rover 25TD) in 1st gear but today when exiting on a intersetion, i pushed a little harder and i notice a "whistle" noise between 2000 and 3000rpm. Sorry but i don´t know how to describe, English isn´t my main language.



I´ve been testing and it makes that sound every time i push it harder (i have to press the accelerator do the floor or else it doesn´t make). Weird thing, i dont notice that sound in any other gear, only in 1st.



I notice a small turbo whistle at 2000RPM but that i always noticed. The car hasn´t catalytic. I think theres the explanation. However that problematic sound, starts when turbo gains pressure.



I don´t know if can be related or not, but the fuel pump is leaking Diesel and last week the mechanic was working on it to change the seals, but unfortunately it was the "pump body" that seems "oval". I will change that next week since i have other pump here.



Sometimes it seems to me, the noise is like a belt "sliding".



Any idea?



Edit: I´ll post a video in a while

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