Vacuum Part Id
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Senior User
Joined: Jan 2006
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From: St. Peter, MN
Vacuum Part Id
I am totally redoing the electrical and engine on my 77 F-150 4X4 and have a question on the remnants of the smog parts. I have black round part about the size of a softball on the drivers side fender apron. One hose runs into the firewall and the other is not hooked up. What is this and do I need it? I don't see this part on any of the posted diagrams here. I dont have any emissions tests here so smog free is the way I'm going.
Also, what do I need to have for vacuum hoses with no smog? I currently have a hose that was hooked at the back of the old carb that teed to the brake booster and somewhere over by the heater inclosure. A hose also runs to the tranny. Not sure what that gets hooked up to. I'll need a line to the dizzy advance also.
Thanks
Also, what do I need to have for vacuum hoses with no smog? I currently have a hose that was hooked at the back of the old carb that teed to the brake booster and somewhere over by the heater inclosure. A hose also runs to the tranny. Not sure what that gets hooked up to. I'll need a line to the dizzy advance also.
Thanks
Senior User
Joined: Feb 2006
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From: Sonoma, CA
The softball is a vacuum canister. I think one side should go to vacuum tree on the manifold and the one through the firewall goes to the hvac controls to distribute the vacuum to blend doors and heater valve if equipped. Do your heater blend doors work now? My guess is not without some vacuum to them. You'll need vac advance for the distrubutor, vacuum for the brake booster and vacuum for the hvac at minumum.
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Joined: Jan 2008
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You need that vacuum reservoir to make sure that vacuum is not depleted during A/C, brake or Cruise control operation.
It's like having an extra large fuel tank .....only for vacuum.
If you have any of these components ,leave the reservoir hooked up.
It's like having an extra large fuel tank .....only for vacuum.
If you have any of these components ,leave the reservoir hooked up.
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Senior User
Joined: Jan 2006
Posts: 128
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From: St. Peter, MN
Thanks for the feed back. I do not have A/C or CC. This is not the original cab but it does have the controls for A/C but no components. This may be why it was thought it (the canister) was not needed.
The heater works very well in all aspects but I'm not familar the vacuum mechanics of you speak of.
Please forgive me. This is my first truck project and I'm learning as I go.
The heater works very well in all aspects but I'm not familar the vacuum mechanics of you speak of.
Please forgive me. This is my first truck project and I'm learning as I go.
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