Vacuum line diagram

only is this in the service manual Chevy
or here
calif , or FED or ?

https://eautorepair.net/Marketing/Default.asp

this link is for an 86 chevy k20 truck --you can also notify coachman for additional manuals or information
1986 Chevy K20 Vacuum Diagram

Here is a link to vacuum diagrams for (GM) Chevrolet trucks between 1980-1987. I Hope this helps you to get the lines replaced. http://www.autozone.com/repairinfo/repairguide/repairGuideContent.jsp?pageId=0900c1528004c3cb

I had the same need on an 87 firebird what I did was go to the junk yard find the same truck with same engine and trace the lines make my own diagram, and in my case buy the hard plastic formed vacuum lines that were broken. hope that helps

there should be a label underside of the hood showing this but as vehicle is a bit oldish may not still be there follow this link you should find yours there
Repair Guides Vacuum Diagrams Vacuum Diagrams AutoZone com

the best advice is take your vin # to the GM dealer and they can put it in the computer and print out a picture of all the lines and where they go,they will do this for free,hope this helps.

Use a industrial vacume tester, check each port coming off of the manifold, run your lines.

Get the Haynes S-10 repair book at the parts store for about $20. It has diagrams for vacuum lines.

Go to auto zone through this link And register for free then click select vehicle, add your vehicle and go to driveability and Emissions controls, than go to vacuum diagrams.

Make sure that your truck vaccume line goes into the intake manifold where there is a vacuume spiggot at the base of the carb. You may have iadvertantly hooked it up to the wrong place.