Vacuum Questions...
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Junior User
Joined: Aug 2008
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Vacuum Questions...
Ok guys, I need some help.
I am restoring my 1980 Ford F-100 with a 302. I just installed a Edelbrock 1406 carb on it. Now this is a 4 barrel versus the 2 that I originally had on it. Now my question is...what do I do with all the extra vacuum lines?
On the new carburetor I see that I have my fuel inlet, the pvc inlet, and then a two different timed ports depending on emissions...or something like that.
Seems that the original carb has a lot more vacuum lines hooking up to it. Any advice on what to do?
Thanks in advance.
I am restoring my 1980 Ford F-100 with a 302. I just installed a Edelbrock 1406 carb on it. Now this is a 4 barrel versus the 2 that I originally had on it. Now my question is...what do I do with all the extra vacuum lines?
On the new carburetor I see that I have my fuel inlet, the pvc inlet, and then a two different timed ports depending on emissions...or something like that.
Seems that the original carb has a lot more vacuum lines hooking up to it. Any advice on what to do?
Thanks in advance.
Laughing Gas
Joined: Feb 2010
Posts: 781
Likes: 8
From: Sanford, NC
I have a 1981 F100 that came with a 302 and 2bbl. I built a 351W for it with a 4bbl carb. I will look at my original 302 carb and try to see what vaccum ports it has and let
you know. I didn't have any problem hooking up the needed vaccum line to the 4bbl.
One problem I did have to solve was the TV rod hook up for the AOD transmission. I don't know if you have a AOD or not but if you do be careful with the TV rod.
you know. I didn't have any problem hooking up the needed vaccum line to the 4bbl.
One problem I did have to solve was the TV rod hook up for the AOD transmission. I don't know if you have a AOD or not but if you do be careful with the TV rod.
Laughing Gas
Joined: Feb 2010
Posts: 781
Likes: 8
From: Sanford, NC
Ok, I checked out the carb that came on my 1981 302. It appears to be a Motorcraft
2150 2bbl. Tag E1TE CMA. It has 2 vaccum ports that I saw, both on the base. It also
has 1 PCV hook up And and a fitting on the top that looks like it may have been a hook up for the air cleaner. Other than that only a vent tube fitting on the front of the fuel
bowl. Hopes this info helps you. When I put in the new 351 engine I also removed the
emmisions stuff because it isn't checked for where I live. That made the all the basic hook ups easier. As I said in the above post the only real issue I had was the AOD TV
rod hook up.
2150 2bbl. Tag E1TE CMA. It has 2 vaccum ports that I saw, both on the base. It also
has 1 PCV hook up And and a fitting on the top that looks like it may have been a hook up for the air cleaner. Other than that only a vent tube fitting on the front of the fuel
bowl. Hopes this info helps you. When I put in the new 351 engine I also removed the
emmisions stuff because it isn't checked for where I live. That made the all the basic hook ups easier. As I said in the above post the only real issue I had was the AOD TV
rod hook up.
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Junior User
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Thanks for the reply. I will check my old carb this afternoon and see for sure how many hook ups I have. I know the new edelbrock has less and that is what confuses me.
I have a 3 speed on the floor so I shouldn't have to worry about the AOD TV.
I did remove the EGR and I do not have to run emissions on this truck anymore so i would like to remove all that I can...but then again...Not sure what I can take off and what I need to leave on. (kind of a shade tree on this).
I have a 3 speed on the floor so I shouldn't have to worry about the AOD TV.
I did remove the EGR and I do not have to run emissions on this truck anymore so i would like to remove all that I can...but then again...Not sure what I can take off and what I need to leave on. (kind of a shade tree on this).
Post Fiend
Joined: Dec 2007
Posts: 8,521
Likes: 16
From: Lost
On the front of that edelbrock there are 2 small vacuum ports. I believe the one that is towards the passenger side is the higher one. That would go to your distributor vacuum advance. The easy way to tell, is start the engine, if no vacuum, or very little is present at idle, it's the right one for the dist.
The other port will have full vacuum at idle, and could be used to supply any other items that are still needed. Such as cruise, heat/ac (factory air) controls, auto trans modulator.
With the emmision stuff gone, there's not much use for vacuum lines on these older trucks that don't have factory air or auto trans......
The other port will have full vacuum at idle, and could be used to supply any other items that are still needed. Such as cruise, heat/ac (factory air) controls, auto trans modulator.
With the emmision stuff gone, there's not much use for vacuum lines on these older trucks that don't have factory air or auto trans......
Moderator
Joined: Jan 2001
Posts: 57,025
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From: Virginia
Thanks for the reply. I will check my old carb this afternoon and see for sure how many hook ups I have. I know the new edelbrock has less and that is what confuses me.
I have a 3 speed on the floor so I shouldn't have to worry about the AOD TV.
I did remove the EGR and I do not have to run emissions on this truck anymore so i would like to remove all that I can...but then again...Not sure what I can take off and what I need to leave on. (kind of a shade tree on this).
I have a 3 speed on the floor so I shouldn't have to worry about the AOD TV.
I did remove the EGR and I do not have to run emissions on this truck anymore so i would like to remove all that I can...but then again...Not sure what I can take off and what I need to leave on. (kind of a shade tree on this).
You should have a diagram on the radiator support with the vacuum schematics. They will have abbreviations of what each component is. Since you have done this, most of the lines you will not need. Off the top of my head, you will need to keep;
The PCV
The brake booster
The line at the rear that goes up to the plastic vacuum manifold mounted on the firewall
The vacuum line to the distributor as was mentioned before
I personally would keep the original aircleaner and all it's hoses to the exhaust manifolds, but that's your choice. If you are going to drive it in the winter I would definitely keep it.
Here's a site where you can look up all those emissions abbreviations.
Dictionary of Automotive Terms A-Z
