Hose diagram for 2.0 GC engine?

[henrymiller]

I checked on this really great side (really good level of support!!) the hose diagram for a 2.0 l to identify which hoses are missing on my 75 2.0 GC engine.

Compared to what I have in my car there are great differences. I tried to capture an overview how my hoses are connected in the attached picture. There are some questionmarks. Maybe someone has any ideas
- whether the shown hoses are connected correctly
- what is missing
- to where I need to put the missing hoses ?

Thanks. HM.

[Dave at Pelican Parts]

One of the two upper question marks should go to the charcoal cannister. The other would either be plugged or left open, your choice. (They apparently started with the port on the fan shroud, then changed over to the port on the engine tin, or vise-versa. Some cars wound up with both, even though only one is used.) The question mark on the air cleaner would likewise be plumbed to the charcoal cannister, but on the other side.

The fan creates positive pressure, which pushes air through the cannister and picks up fuel vapors. These go through the other hose to the air cleaner where they are burned. The vapors get to the cannister through a very small hose in the center tunnel--check for an extra metal fitting down there.

Cars up through early 74 had the cannister up above the fuel tank, so there was no small fuel vapor line. Instead the fan shroud and air cleaner hoses hooked to plastic lines that ran through the driver's rocker.

The rest of it looks fine to me.

--DD

[RandyLok]

Yours has a tap on the front side of the throttle body for distributor advance? Mine only has one tap, for retard, on the rear side. I thought all the later model 2.0s did not use vacuum advance. Hmm.

Good idea working on the diagram BTW.

[RustyWa]

Good job on the diagram. There wasn't one for the later cars when I was looking.

My '75 2.0L had two taps on the throttle body. I was never sure how the second port was supposed to be hooked up as I think it also went to the EGR valve.