Just to make sure the party pumps you have work try this test before connecting to keg: with the handle in the tap (down) position you should be able to pump and have air come out of the base. Or with the handle in the untappped(up)position, squeeze the faucet open and you should have air come out. This also assumes your party pumps are clean and the beer line to the faucet is unobstructed.
I'm sorry to say, but I do not know the valve/coupler for Felsgold. What does it compare to on the cross reference list:
http://www.micromatic.com/category.php?cid=801
Maybe another Forum memeber is familiar with this brand.
Mike Godwin, Micro Matic USA, Inc. Northridge, CA