Where are the vacuum lines in a firewall?
Where are the vacuum lines in a firewall? I replaced all vacuum lines and still had the problem. That is when I noticed that the vacuum line (clear/black) going into the firewall was damaged in 2 places in the plastic area (there are 2 vacuum lines going into the firewall at this point directly behind the battery). Can a check valve be replaced at the firewall? Click to expand... Yes, all engine lines have been replaced abd the check valves are good. The problem is that line that goes through the fire wall broke at the firewall and was cracked...