in my opinion , ' `# w+ Z5 l8 o% j( E1.the noise is coming from the gears .the engine oil lubricating the gear is not enough ( S% z2 P7 g* n * Q z) l1 m8 f* J* ?; c5 c4 [7 U1 u2.the loadmatch of the Engine and the Pump is bad or the fuel filter has big resistance