Vacuum lines?
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Senior User
Joined: Apr 2017
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From: Spokane, WA
Vacuum lines?
How many vacuum lines are there on a 79 400? My truck is idling rough after running for 5-10 minutes. Now I know I keep getting stuff in the little dinky fuel filter as I have replaced 3 already because the truck sat for so long now that it's been driving and running with gas in it stuff in the tank has been loosening up I believe. I just want to check all my vacuum lines as well to be sure.
Cargo Master
Joined: Nov 2011
Posts: 3,354
Likes: 48
From: Great American SouthWest
The number of lines depends on a lot of things:
Factory AC will have one
Power brakes will have one
PCV is a vacuum line
Automatic transmission will have one
Ported vacuum for distributors advance
EGR will have at least one
Thermostat housing may have two
Air cleaner may have one or two
Cruse control may have one
You likely have one or two vacuum cans
Check the condition of your hoses and caps. Some will be hard to see, as they may be on the back side of the carburetor. Then put a gauge on, and check the reading
Factory AC will have one
Power brakes will have one
PCV is a vacuum line
Automatic transmission will have one
Ported vacuum for distributors advance
EGR will have at least one
Thermostat housing may have two
Air cleaner may have one or two
Cruse control may have one
You likely have one or two vacuum cans
Check the condition of your hoses and caps. Some will be hard to see, as they may be on the back side of the carburetor. Then put a gauge on, and check the reading
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