Just noticed that the line from the vapor canister to the carb is missing, where on the carb should it be connected?
Stock 74 350 auto trans Q jet.
Does it connect to the fitting just above the carb fuel inlet? PG.

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Checked my '73 Assy Man. and it shows the large hose (vapor line) going below the fuel inlet which is where yours appears to be. The small hose (vacuum signal line) goes to a nipple near the lower, left (driver's side) front corner of the carb for a 4 spd. For the auto. it goes into a tee near the left front corner and the tee has a line which appears to go somewhere near the front, lower, center of the carb.

I think any ported vacuum fitting on the carb would work. The signal line opens a valve on the charcoal cannister that allows the vacuum in the vapor line to suck any gas vapors stored in thecannister into the intake and burn. I know from experience that if you lose the signal line or the valve leaks (what happened to me), the cannister will fill up with raw gas and start dripping out. []
Repaired the valve and all was well.

Hope this helps.

 

Hi 73shark and thanks for the help.
Looking at the picture the first and top hose on the left (behind the choke pull off) with the long connection from the carb, goes to the vacuum advance can.
The other end of the choke pull off connects behind the big inlet nut on the carb.
The hose with 3/8 on it goes to the EGR, but it is blocked with a blot so it does nothing but looks connected.
The next smaller hose (to the right)goes to the PCV, it is connected and works.
I have no AIR pump and no holes in the exhaust manifold and nothing on the thermostat housing.
So do you think that the vapor canister should connect to the port on the carb that is now caped? The one above the big nut?
Thank for the help, PG.

 

Found a ported vacuum fitting on the carb now I just have to get some new line, that should do it, thanks, PG.

 

Here's a pic of the page in the assy man. Don't know if it's clear enuf to be any good.


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Edit: Looked at your pic again and I thought the hose with 3/8 on it would be the one for the PCV since it goes to manifold vacuum. I think the one by the throttle solenoid is probably the vapor line for the cannister. Try to find a '74 at a car show that's got correct hoses.

I made a block-off plate out of 1/4" alum. plate in place of the EGR valve.

You probably already know this but the choke pull-off dashpot also is what allows the secondary air valve to open slowly as the vacuum falls off when you floor it to prevent bogging from fuel starvation. It's the Q-jet answer to vacuum operated secondaries. There's a wrap-up spring on the air valve which allows the air flow to open the air valve that can be adjusted also. I always keep mine just tight enuf to keep the air valve closed.

 

Hiagain 73shark, once you told me that the vapor can connects to ported vacuum, it became a lot easier to figure out. I got some new hose today and a T fitting so it will get connected properly tomorrow.
The picture from the assembly manual is just what I needed to figure out how to route the hose.
Thanks again, PG.

 

Hi pg, can't help much here as all I have to go on is my '78. Mine has three hoses from the charcoal canister, largest (3/8) from can to a tee with the PVC line, a line that is about 1/4 in. from can to the carb. bowl vent, smallest hose(3/16) from can to ported vacuum but this is also tee'd with EGR after it comes out of a thermal switch on the manifold water cross-over. Hope this gives you a little more to go on.

 

Thanks 78buckshot, my charcoal can had only two connections the 1/4 inch one was missing. It was a quick and easy job, now maybe the garage won't stink from gas fumes anymore.

Good luck with you engine mod's, keep us posted it's interesting to learn what to do! PG.

 

If after you get it plumbed correctly and get some miles on it, if it still smells, you might want to check the plastic valve on top of the cannister for leaks. That's what happened to mine. A little bit of glue fixed it.

 

OK, I'll check that and let you no, thanks, PG.