i'm reinstalling a 3800 sc engine in my car. I have a question about the vacuum lines.. coming off a nipple near the coolant fill is a vac. line going to a black cylander. does anything get hooked up to the other side of the black cylander? what gets hooked up to the nipple under the sc snout? i know one line goes to the fuel rail and another goes to rectangular box. where does the evap canistar get hooked up to?
The "t" under the supercharger is for the MAP, fuel pressure regulator and the boost bypass solenoid. I believe the "rectangular box" you'e referring to is the MAP sensor. The evap connects to the 3 prong tree on top of the supercharger.
From under the snout - It goes to the Fuel Pressure Regulator, the MAP and to the BBV solenoid, if equipped.
The other end of the BBV solenoid goes to the bottom of the BBV actuator. Some cars delete the BBV solenoid and just run directly to the bottom of the BBV actuator. Some delete the BBV actuator all together.
A vacuum source that is located between the SC and the throttle body needs to run to the Power Brake Booster, the top of the BBV actuator if equipped, and to the Evap Purge Solenoid if equipped.
The other end of the Evap Purge Solenoid runs to the Purge port of the charcoal canister.
I guess since this thread is already vacuum related I could ask this dumb question: does it matter what orientation the MAP sensor is mounted? They always seem to be mounted the same on all cars. I would think it wouldn't matter and would be the same resistance no matter what?
------------------ 86 Fiero GT 4spd - (pending L67 swap: VS cam, GenV) 98 GTP - Some mods