Karcepts KFL02 - Manual (Page 7)

4. FUEL PRESSURE REGULATOR INSTALLATION
After all fittings have been tightened into the FPR, install it onto the right end of
the Karcepts Fuel Rail. It may first appear that you may need a very thin wrench
to tighten the -8an to -6an swivel reducer used between the FPR and fuel rail, but
that is not the case. You can first tighten the -8an swivel side into the fuel rail by
hand until it starts to get tight. Once too tight to turn by hand, hold the -8an side
where it is and rotate the FPR down until both hex flats line up. Attach a wrench
onto both hex flats and tighten the fitting into the fuel rail. You will only be able to
tighten a few degrees at a time with the limited space; so you will have to release
the wrench and then rotate the FPR down once again to match hex flats at a new
position. Repeat this procedure until you are able to install the fitting snuggly into
the end of the fuel rail.