Where does this connect ?

[Zedman]

Hi All-

I am hoping somebody with a 1981 circa Avanti II with the ECU controlled Carb might be able to confirm the vacuum end of the line connected to the MAP Sensor in the picture. I don't rightly know where it sources its vacuum from other than making assumptions it is variously fitted to the carb or manifold somewhere.  The Sensor end is bundled with the wiring harness running along the right hand fender skirt- so I really don't know where it originates from. The tube appears to have a rubber end on it that fits on the MAP Sensor barb, but the line appears to be very thin plastic.   I'd really appreciate somebody having a look for me please !

 

[Desert Driver]

I've got an '84 and looks like the same set up as yours. The thin vacuum line is ported off the rear of the carb and heads toward the passenger side firewall where it enters a wiring loom. It then exits the loom and is connected to the sensor (shown in your photo). There are all kinds of vacuum hoses in the engine compartment and tracing them down can be challenge. Hope this helps!

[Zedman]

Hi Desert Driver- Yep !  That looks like it's the same line ... Thanks so much for confirming what I have to look for and where it emanates. The Body is off the frame and on supports, I can easily go find the loose ends and at least put a tag on 'em. Much appreciated. 🖖