73 302 factory carb. Passenger side. There is a tube coming out at a slight angle near the top of the carb. It is forward of the choke ( not the heater tube for choke ) . It appears that there is a short rubber hose connected to a brass tube that goes down along the side of the engine to about the bottom of the oil pan that may have been connected to it. The brass tube at the oil pan level is not connected to anything. Any Ideas? Someone was kind enough to remove the EGR valve from the back of the carb and plate it off. They ran the vacuum line back to the intake manifold. Any adverse effects? I know I live in Florida and many think you don't need a choke but the little tube on the exhaust manifold for the heat riser tub is broken. Any quick fixes? Any conversion for the factory carb to Ele choke only? Just trying to get a plan before Jump in. Thanks in advance for any input.
Transmission modulator lines appear to come up back side of carb. This is just in front of the choke. On the road until Friday will try and get a picture then
This is the fresh-air inlet for the choke. It attaches to the bottom of the exhaust manifold. They sometimes break off and go un-noticed for a long time.
Paul You have confused me. I know the heat riser tube connects to the choke body and to the exhaust manifold. The tube I am asking about is forward (toward front of car ) of the choke body. Starts near the top of the carb. Looks like a vacuum port of some type. Tube that appears to have connected to it and runs down the side of the engine is about a foot forward of the heat riser tube. Fresh air for the choke? What does that do for me? I do not see any other place on the exhaust manifold to connect to. I will try and get a picture tomorrow.
Yes, I believe that if you look at the port it goes through the air horn of the carb near the top. Fresh, filtered air is pulled through the tube in the exhaust manifold and into the heat riser tube and finally into the carb. The line you are talking about is the fresh air supply for the choke. It connects to the exhaust manifold directly under the heat riser tube that goes to the choke. I looked and found this picture - not all have the 90 degree fitting.
Opps I was wrong Paul You are correct. Thanks for the picture Next time I will not ask a question from memory sitting in a hotel. It appears that the fitting is missing and the nipple broken at the manifold. Is there a fix for this or do you have to replace the manifold? Not sure I have to have it here in Florida. There is another vacuum tube that has a small piece of rubber tubbing coming from the back. It is show in the Picture to the left of the fresh air line. Any Ideal on this one?
The white cap at the rear (upper left in your picture) is the fresh air vent that goes to the choke fresh air intake line. (which it is pointing to in the picture) The white cap at the base of the carb should go to your distributor vacuum advance. (unless you are running manifold vacuum to it which is fine) If the choke fresh air tube is broken or the fitting is not there you can drill out the manifold to just under 1/4" (use a number drill that is .245 - .247") Then you can swage a 1/4" tube into the hole you drill and bend it to fit (better to bend first)
Thank you Paul Thank you for you help. I am running the distributor advance to the middle port on the PVS valve. The white cap at the base I think should go to the bi metal valve on the air cleaner that operates the hot air intake flap. I am trying to keep it as much factory as possible. At least until I figure out how every thing works and how it will effect the performance if i change it.
The posting from Paul S has a photo of an exhaust manifold showing the two lines, one to take filter air down to the manifold chamber and one insulated line to bring hot air to the choke.
