Here is a link to some information on the secondary well.
There were 4 secondary wells produced and if you have the wrong one you can affect the flow of fuel into the secondary well. The way to check is to remove the compensator jet and see if the boss on the secondary well is interfering with the flow of fuel to the secondary well. Remove the compensator jet and take a pencil and through the compensator jet hole mark the secondary well, remove the secondary well and if the pencil mark is on a boss it is affecting fuel flow. To correct the problem either replace the secondary well with one that does not impede fuel flow or put two gaskets on the compensator jet.
http://www.modela.org/secondary_well.html