I have a intank fuel pump from Walbro with a Rev hard turbo kit. It uses a FMU setup. I noticed my spark plugs kinda dark. I was wondering if my engine is running lean because of the intank pump? Would I need to use a inline pump or the intank shuold be ok for 7 psi of boost? Thanks.

 

with fmu you still need the inline pump even if you got hte high pressure walbro it still not enough for hte pressure that then fmu will try to incraese.