The Collaborative International Dictionary of English v.0.48:

Feck \Feck\, n. [Abbrev. fr. effect.]
   1. Effect. [Obs.]
      [Webster 1913 Suppl.]

   2. Efficacy; force; value. [Scot. & Prov. Eng.]
      [Webster 1913 Suppl.]

   3. Amount; quantity. [Scot. & Prov. Eng.]

            He had a feck o' books wi' him.       --R. L.
                                                  Stevenson.

   The most feck, or The feck, the greater or larger part.
      "The feck o' my life." --Burns.
      [Webster 1913 Suppl.]