Vacumn lines

[naa10104]

Anyone have a good diagram that shows where all the underhood vacumn lines route to ? Those that run to the EGR valve, carb etc. Thanks

 

[Don C]

You should be able yo find something here:

http://www.7173mustangs.com/thread-vacuum-hose-diagrams

You can find just about anything you need on this forum by running s search in the box at the upper right.

 

[jbojo]

I believe that 3-14A calibration is for a 73 351 2v.

They can also be found here: http://mustangbarn.com/1973-engine-vacuum-diagrams.html

 

[Don C]

I believe that 3-14A calibration is for a 73 351 2v.

They can also be found here: http://mustangbarn.com/1973-engine-vacuum-diagrams.html

Thanks John. I updated the diagrams.

 

[naa10104]

I believe that 3-14A calibration is for a 73 351 2v.

They can also be found here: http://mustangbarn.com/1973-engine-vacuum-diagrams.html

Thanks John. I updated the diagrams.

Hello,

The above diagram does not seem to match my 73 351 C 2v, C6 auto, non AC car. I will try to attach some photos and explain further. My motor does have a PVS Valve(?) to the passenger side of the water pump with three available connections although only two are used the lowest is blocked with a cap. The diagram shows all 3 with a vacumn hose attached.

My car does not have the two nipple temp control vacumn valve,(#2 in the diagram ).It does not have #'s 5,6,or 7 either.

On the intake manifold forward of the carb behind the dist. there is a one nipple ... looks like a sensor screwed straight down into the intake manifold, this is capped and does pull vacumn when the engine is running.

My engine does not have #4 either.

Directly behind the engine on the fire wall is a 4 hose connector with two lines going down to the trans and the other two going to the engine.

On the back of the engine in the intake manifold there is another vacumn tree screwed into the top of the intake manifold. There are several hoses on this tree and some of the openings are capped. I just want to make sure that the correct hoses are in the correct places.

Are the multi tree vacumn to the rear of the carb and the single capped valve source to the front of the carb on the intake the spark port and EGR port ? If so which is which ?

One of my issues is the egr appears to be getting vacumn but the bi metal switch that controls the flap in the end of the snorkel does not. Any suggestions or a more accurate diagram would be great thanks.

 

[Don C]

It's likely that a previous owner modified your vacuum/emission system. You have the choice of returning it to original, leaving it as is or even further modifying it. The choice will also depend on your DMV's requirements.

The vacuum for the flapper comes from the intake manifold and is controlled by the bi-metal valve in the air cleaner.

 

[naa10104]

It's likely that a previous owner modified your vacuum/emission system. You have the choice of returning it to original, leaving it as is or even further modifying it. The choice will also depend on your DMV's requirements.

The vacuum for the flapper comes from the intake manifold and is controlled by the bi-metal valve in the air cleaner.

Question, right now the line that feeds the bi - metal switch in the air cleaner comes off what looks like a temperature sensor switch near the water pump housing. This line is on a tee that feeds the EGR and the bi metal switch. Does that sound right to you ?

 

[jbojo]

That is usually connected to the vacuum tree on the manifold behind the carb. That bimetal switch in the air cleaner is what ports the vacuum to the vac motor on the snorkle which allows warm air to the carb intake until the motor warms up.

Is you distributor a single or dual vacuum model?

 

[naa10104]

That is usually connected to the vacuum tree on the manifold behind the carb. That bimetal switch in the air cleaner is what ports the vacuum to the vac motor on the snorkle which allows warm air to the carb intake until the motor warms up.

Is you distributor a single or dual vacuum model?

Hello,

Single ... and it is a period correct 351 2v that was cast in 72 in a 73 Mustang.

thanks

 

[jbojo]

That is usually connected to the vacuum tree on the manifold behind the carb. That bimetal switch in the air cleaner is what ports the vacuum to the vac motor on the snorkle which allows warm air to the carb intake until the motor warms up.

Is you distributor a single or dual vacuum model?

Hello,

Single ... and it is a period correct 351 2v that was cast in 72 in a 73 Mustang.

thanks

Here is a diagram for a 73 with ram air. It would have been the 2v carb so just ignore the ram air lines. Single diaphram distributor.

72%20351C%204v%20with%20single%20diaphragm%20distributor,%20dvcv,%20electronic%20spark%20control,%20NASA%20Ram%20Air,%20

 

[naa10104]

That is usually connected to the vacuum tree on the manifold behind the carb. That bimetal switch in the air cleaner is what ports the vacuum to the vac motor on the snorkle which allows warm air to the carb intake until the motor warms up.

Is you distributor a single or dual vacuum model?

Hello,

Single ... and it is a period correct 351 2v that was cast in 72 in a 73 Mustang.

thanks

Here is a diagram for a 73 with ram air. It would have been the 2v carb so just ignore the ram air lines. Single diaphram distributor.

THanks very much !

 

[naa10104]

That is usually connected to the vacuum tree on the manifold behind the carb. That bimetal switch in the air cleaner is what ports the vacuum to the vac motor on the snorkle which allows warm air to the carb intake until the motor warms up.

Is you distributor a single or dual vacuum model?

Hello,

Single ... and it is a period correct 351 2v that was cast in 72 in a 73 Mustang.

thanks

Here is a diagram for a 73 with ram air. It would have been the 2v carb so just ignore the ram air lines. Single diaphram distributor.

Hello,

I looked at numerous vacumn diagrams for my car and very similar setups. I never found one that was identical to mine ... my vehicle is stock and does not appear to have been altered. At any rate I made some educated guesses using the different diagrams I had located. The main issue was that the flap in the end of the snorkel was not functioning even though I had replaced the bi metal switch. I knew that the vacumn motor for the flap was working as I had put it under vacumn and it worked. What I ended up doing was reversing two of the vacumn lines that come out of the 4 line tree on the firewall. One of these lines I placed onto the input side of the bi metal switch so it had vacumn. I then took the line that had been on the bi metal switch and placed it where other line was ... on a multi connection tree out of the intake manifold. Now everything works fine. I know there were issues with the vacumn lines as two were reversed for the trans when I got the car. Thanks for everyones help.

 

[naa10104]

Hello,

Single ... and it is a period correct 351 2v that was cast in 72 in a 73 Mustang.

thanks

Here is a diagram for a 73 with ram air. It would have been the 2v carb so just ignore the ram air lines. Single diaphram distributor.

Hello,

I looked at numerous vacumn diagrams for my car and very similar setups. I never found one that was identical to mine ... my vehicle is stock and does not appear to have been altered. At any rate I made some educated guesses using the different diagrams I had located. The main issue was that the flap in the end of the snorkel was not functioning even though I had replaced the bi metal switch. I knew that the vacumn motor for the flap was working as I had put it under vacumn and it worked. What I ended up doing was reversing two of the vacumn lines that come out of the 4 line tree on the firewall. One of these lines I placed onto the input side of the bi metal switch so it had vacumn. I then took the line that had been on the bi metal switch and placed it where other line was ... on a multi connection tree out of the intake manifold. Now everything works fine. I know there were issues with the vacumn lines as two were reversed for the trans when I got the car. Thanks for everyones help.

Follow up question ... on my car there is a 4 line vacumn connection coming out of the in the center up high, 2 lines go to the trans and the other 2 to the motor. What is this 4 line connector for ? Does it go into the passenger compartment to run vacumn for the HVAC ? Keep seeing something called a vacumn loop ? thanks

 

[Bill73Ragtop]

You are on the right track. Two vacuum ports go inside to run HVAC. The other two are transmission modulator related. Originally my C6 modulator had dual vacuum ports. The replacement modulator now only has one which can free up a vacuum port if needed.

 

[naa10104]

You are on the right track. Two vacuum ports go inside to run HVAC. The other two are transmission modulator related. Originally my C6 modulator had dual vacuum ports. The replacement modulator now only has one which can free up a vacuum port if needed.

Thanks very much !

 

[naa10104]

You are on the right track. Two vacuum ports go inside to run HVAC. The other two are transmission modulator related. Originally my C6 modulator had dual vacuum ports. The replacement modulator now only has one which can free up a vacuum port if needed.

Thanks very much !

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 !