5520ch injection pump Noise?

[HK45]

I have a new 5520ch. I live in pa. Everytime i start the machine cold the doowon injection pump is really noisy. As it warms up it go's away. I have clean fuel and treat it. Is this normal? Anybody else have issue? Thanks

 

[HawkinsHollow]

Mine does the same thing. Doesn't take long for it to quiet down though.

 

[HK45]

Great thanks for the info. Mine runs great just that noise at start up.