help, breathers po ba itong nasa pic?

Toyota diesel 2c-t engine.

click thumbnail to enlarge


the two indicated red spots, are they breathers? do they have a specific name?

the one that connects to the injection pump (indicated in blue) ano po ba ang gamit nyan?

at ano po ba ang mangyari kung the source got accidentaly switched to each other?

pasensya na po sa daming tanong...