Vacumn Lines

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naa10104

Well-known member
Joined
Jul 26, 2014
Messages
446
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1
Location
Reston, VA
My Car
1973 Convertible, matching #'s H Code, Auto
Hello,

Still trying to get this squared away .... hope this info helps.

I have a 73 Convertible with a 351 C 2V C6 auto, no A/C,... PS/PB. Regular air cleaner no ram air. I need an accurate diagram to show how the vacumn hoses are supposed to run from the firewall forward to the carb, egr, dist.(single diaphram), trans etc. My engine is very basic no spark delay valves, etc. I have searched probably hundreds of diagrams and have not been able to find the correct diagram that matches my car.

I want to make sure that the lines are now correct I know for a fact that the trans vacumn hoses were incorrect and the vacumn line going to the bi metal switch in the air cleaner was wrong. Just want to validate that all the other hoses are correct.

At present here are how the vacumn lines run :

Facing the firewall there are four vacumn connections that come out of the firewall ...

Left to right - 1,2,3,4

#1 goes to a tee connector, one side of the T goes to the EGR valve and the other side goes to coolant sensor switch at the front of the motor near the water pump ... connects to the top nipple of three.

2 and 3 go to the trans

#4 goes to a multi vacumn line connector at the back of the intake manifold that supplies vacumn. Two of the nipples on this multi connector are plugged. One goes to the brake booster. one to the bi metal switch in the air cleaner that opens the damper at the end of the snorkel.

CARB

Facing the car from the front, one line comes out of the left side base and goes into the middle nipple of the sensor switch at the water pump.

On the right side of the carb at the base a vacumn line goes to the distributor.

Of interest there is a vacumn nipple on the intake manifold forward of the carb that is plugged but does produce vacumn at idle. Also, the bottom nipple on the sensor at the water pump is plugged.

The car runs well ... just want to make sure they are run correctly.

Appreciate any help !

 
Is this the one? Connection 13 goes from the center connection of the vac modulator on the tranny to the 4 port connector 4 on the bulkhead to the vacuum tree on the manifold. Circle 12 is the other connect on the tranny to the emissions systems.

73%203-12E.jpg

 
Is this the one? Connection 13 goes from the center connection of the vac modulator on the tranny to the 4 port connector 4 on the bulkhead to the vacuum tree on the manifold. Circle 12 is the other connect on the tranny to the emissions systems.
Hello,

My car does not have #4 or any of the valves,(spark and check). Temperature control valve on my car has three ports not two. On my car the two vacumn hoses coming from the carb base are opposite of what is in your diagram. I have looked everywhere for the correct diagram and can't find it. Thanks

 
Chances are, someone has modified your vacuum system, possibly due to failure of some component or maybe to improve performance. As such, you will never find a diagram that fits your existing condition. You will need to select the diagram that is closest to matching the components you have remaining, and use that as a guideline to replace missing components and run the vacuum hoses accordingly. The other option is to further modify and simplify your vacuum system by following other, simpler, diagrams.

 
Chances are, someone has modified your vacuum system, possibly due to failure of some component or maybe to improve performance. As such, you will never find a diagram that fits your existing condition. You will need to select the diagram that is closest to matching the components you have remaining, and use that as a guideline to replace missing components and run the vacuum hoses accordingly. The other option is to further modify and simplify your vacuum system by following other, simpler, diagrams.
+1 on Don's comment.

I have gone through many diagrams trying to get one close to the system you describe. I was also coming to the conclusion that your system is probably modified.

 
Chances are, someone has modified your vacuum system, possibly due to failure of some component or maybe to improve performance. As such, you will never find a diagram that fits your existing condition. You will need to select the diagram that is closest to matching the components you have remaining, and use that as a guideline to replace missing components and run the vacuum hoses accordingly. The other option is to further modify and simplify your vacuum system by following other, simpler, diagrams.
+1 on Don's comment.

I have gone through many diagrams trying to get one close to the system you describe. I was also coming to the conclusion that your system is probably modified.
THanks to both of you for your input !!!

 
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