Thread: Runs rough after changing valve cover gaskets
View Single Post
  #11  
Old 10-31-2008, 06:25 PM
sbourg sbourg is offline
Registered User
  
Join Date: Jul 2001
Location: SoCal
Posts: 1,303
The vent outlet from the pressure regulator - if sealed - will prevent the regulator from working properly. It mechanically compares fuel pressure to air pressure, using the vent hole. The reason for connecting to the breather tube is to prevent fire danger if the diaphragm ruptures. It must see some pressure close to 1 atm or it will not control properly.

Steve
__________________
'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7
Reply With Quote