try autozone.com/repairinfo

Hiya...

Which end of the head is the fuel residue found?  Drivers' side or passenger
side?  If it's passenger side, that is where the return pipe for the fuel
system is.  I know from experience that if that pipe is not seated
correctly, or the flange that it bolts onto the manifold with develops a
crack OR the o-ring inside the pipe is shot or unseated...fuel will leak out
of there quite steadily once the fuel pump is switched on.  It's a common
pain every time I've disassembled either the head or the manifold, or
both...but it's an easy fix.

B.

PS: If it's one of the injectors...well, that's one I haven't done yet...so
you might want to go with a Haynes or Chilton manual for it.  I prefer
Haynes, as Chilton is generally written for someone with a well-equipped
shop, where Haynes is written more for an average shadetree mechanic with
more generalised tools.  Good Luck!