You need to add the following setting to your FSISYS.INI file:
< PrtType:PCL >
SendColor = Yes,Enabled
Other things to check:
Make sure certain elements in the FAP file have been set to print in color, such as text, shaded areas, and so on.
Make sure that the FAPs have been precompiled with the /C option on the FAP2MET utility.
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