ORIGINAL: Stickbuilder
Sounds like the pump needs cleaning. I would clean the carb as well. take notes as to the original low and high speed needle settings. (count the turns to close) and set the needles to these positions when re-installing. You won't believe the trash that can be found there. Sounds like this may fix your problem. The .61 SF is kinda fool proof. (as long as you don't run it too lean and cook it)
I don't know what it involves in cleaning the pump, I never seen one before and from what I think, from hearing others saying that is has a diaphragm type thing I wounder if it' made out of rubber?? there are two screws on the pump. for fuel adjustment as far as the high speed needle! I turned it to closed, and turn anticlockwise to rich (3 turns). but did not touch any other settings, Your right I've been told that when you have the setting right you should never have to touch them unless you change fuel, location, or extrem weather conditions. I did not have a chance to go at it since the first time, I will try again this weekend.
Thanks
roltech