Well remember that I didn't do the molasses deal.
I know 3 people now who HAVE done it in the last 4 months..
I pasted 2 of their versions here.
Use the search button above and enter 'molasses' ... that should take you to the 2 or 3 threads about it.
Read both the versions I copied... they answer all your questions .. Its very clear that it works.. both the guys said they were surprised at how great it worked ... and the ratios of molasses to water are stated on the one thread .. approx. 7 parts water to 1 part 'blackstrap' molasses.. (which you can buy at some food stores for less than $5).
If you have the time to wait 2 weeks or so ... I'd do it in a heartbeat .. (and I am going to do my PA this winter .. cuzz 2 inline fuel filters don't stop the rust crud from getting into my carb.)
If you'd rather wait till winter like me ... then buy a PAPER filter inline fuel filter (unlike mine) ... I do believe that will stop the rust crud from getting to the carb ...