Does anybody know what liters per hour the replacement fuel pump is? How about the stock one?

 

Comes with a 255 pump I believe. Either way yes use the Walbro 255.
Not sure on the grinding sound. I know the sc'ers do make rattling and grinding noises even when working perfectly.
I have a Vortech SC not installed yet and when I spin it manually it also makes a slight grinding sound as it goes around.
I think it is normal but I'll let others chime in here.
I sure hope it is as I am having it installed next Friday lol.

 

Thanks for the info! Looks like I am good to go Second opinions welcomed.