vacuum help
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Freshman User
Joined: May 2013
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vacuum help
hey have a 83 f100 l6 4.9l single barrel carb
im having a little confusion with the vacuum line attached are some photos
the one is numbered I need to know what each port is or is for so I can run the vacuum lines to them
Cargo Master
Joined: Mar 2008
Posts: 2,561
Likes: 206
From: Washington
On the first pix, that is the WOT, it is used with the EGR to disable it when you floor it.
WOT = wide open throttle
Looking at the vacuum diagram photo in the lower left corner on the same line as DUAL TANKS it should say 4.9. It is cut off in the photo.
Is the Dist "Dual Vacuum"?
Is this a Calif truck?
I would edit the post title to include...... 1983 4.9 - Photos needed of vacuum lines.
Good luck, Jim
WOT = wide open throttle
Looking at the vacuum diagram photo in the lower left corner on the same line as DUAL TANKS it should say 4.9. It is cut off in the photo.
Is the Dist "Dual Vacuum"?
Is this a Calif truck?
I would edit the post title to include...... 1983 4.9 - Photos needed of vacuum lines.
Good luck, Jim
Lead Driver
Joined: Jul 2009
Posts: 6,477
Likes: 19
From: Sheffield, AL
Okay, I think I can help with some... Keep in mind that my engine has been desmogged [Duraspark conversion].
Using your numbering system from the photo at the top of the thread...
1. I believe this is ported vacuum for the distributor vacuum advance.
2. ? All I see is a hose and cannot tell where it is connected. [PVC hose connection]
3. This port is the vacuum source for the junction mounted on the firewall which then is connected to the ventilation system.
4. This was connected to the emission system - now capped on mine.
5. ?
6. This port supplies vacuum to the temperature sensor located on top of the air cleaner.
What is missing is the PCV hose connection. This is a large rubber hose [similar to the PB booster line]. On mine, it connects to a large vacuum port located at the base of the carburetor. Now that I look again, I believe #2 is for a somewhat hidden port which will be the PVC connection.
I hope this will be of some assistance!
Using your numbering system from the photo at the top of the thread...
1. I believe this is ported vacuum for the distributor vacuum advance.
2. ? All I see is a hose and cannot tell where it is connected. [PVC hose connection]
3. This port is the vacuum source for the junction mounted on the firewall which then is connected to the ventilation system.
4. This was connected to the emission system - now capped on mine.
5. ?
6. This port supplies vacuum to the temperature sensor located on top of the air cleaner.
What is missing is the PCV hose connection. This is a large rubber hose [similar to the PB booster line]. On mine, it connects to a large vacuum port located at the base of the carburetor. Now that I look again, I believe #2 is for a somewhat hidden port which will be the PVC connection.
I hope this will be of some assistance!
Last edited by 1986F150six; Jan 30, 2015 at 12:43 PM. Reason: Added to the PVC port location.
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