in my opinion , 6 T- L7 p% ^2 I8 n- j8 h
1.the noise is coming from the gears .the engine oil lubricating the gear is not enough 3 Z" C V4 i5 d! ]; b4 p) g7 |6 G4 P$ `
2.the loadmatch of the Engine and the Pump is bad or the fuel filter has big resistance