Wallen: The neoprene tip needle is no longer recommended for any application. Part of the problem is it tends to swell in the presence of some common (today) fuel additives, especially in auto gas. Second, there are a lot of needles in the field of questionable heritage and they are even more likely to cause trouble.
Both your loss of power and your leakage could be caused by a swollen needle tip. A "good" neoprene needle is the least likely to leak, so, given yours was leaking, I'd get rid of it post haste. I personally prefer the Delrin needle over the steel one. While the Delrin needle uses the same seat as the neoprene needle, I recommend a new seat at the same time for the best results. The steel needle requires a different seat, so you must replace both if this is your choice. The most current versions of the Stromberg articles Hartmut referred to can be found in the forum section of www.cessna120-140.org John Cooper Skyport Services 4996 Delaware Tnpk Rensselaerville, NY 12147 518 797-3064 www.skyportservices.net
