Increasing the CONTROL pressure will lean it out. The control pressure acts as a spring against the top of the plunger. Changing the shims to thicker shims raises the PRIMARY pressure which will increase the flow. The control pressure acts against the primary pressure. Joe Kuchan --- In dmcnews@xxxxxxxxxxxxxxx, Marc Levy <malevy_nj@...> wrote: > > I have been told by a number of people that INCREASING > the fuel pressure on these fuel systems will LEAN the > mixture. Yes, I know it does not make sense.. But > when it was explained to me, it made sense at the > time... I forget the reason now!! > > Also, if you increase the pressure, then wont you also > increase the resistance on the plunger?? if so, you > will be making it harder to open the the meter flap > and it will cause additional restriction in the intake > path. To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/dmcnews/join (Yahoo! ID required) <*> To change settings via email: mailto:dmcnews-digest@xxxxxxxxxxxxxxx mailto:dmcnews-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/