Join Date: Dec 2009
Bikes: late 80's bianchi campion d'italia, early 90's trek 2100, early 90's shogun selectra, mid 90's aluminum marin xcMTB, dept. store grade but upgraded columbia double eagle tandem
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For starters, you need to disconnect the cable and pull the cage out by hand, to ensure the FD is actually capable of performing the task. double check that you are adjusting the limit screw correctly. I say this because you don't set the limit screw to "push" the derailleur out. For "as far as possible", it might as well not even be there. provided that your derailleur is capable of going where you want it to with no cable, ensure that your shifter is pulling the derailleur to its limit.
For better answers from more qualified people, specify the brand/model of your frame, derailleur, shifters, bottom bracket and crankset, and its approximate vintage. some stuff just won't work together.