2 vacuum lines coming from break booster

[Ken mosher]

Hi there, new to this forum.
Quick question hopefully someone might know because I cannot find a solid answer anywhere.

I just got a motor swap done on my truck,. But now I can hear a vacuum leak. Now there are two line hook ups from the break booster,. One is going behind the throttle body (bigger) the other one (smaller) is non existent but thats where I can hear suction, even from in the cab.
Does anyone know where this line goes to or if there's a line that's suppose to be on there? My mechanic has no idea.

I have attached a picture of it.


Also, I am now getting about 30-40 L per 100Km or 5-7 MPG now, when I used to get. Between 18-25 L per 100km before the motor swap... Anyone know what might be the cause of this too

 

[srv1]

I believe that just has a cap on it.Huge vac. leak if not capped. welcome to the forum.

 

[HemiLonestar]

LMAO!! Another one, this just happened to someone else lol: https://www.ramforum.com/threads/power-booster-help-2003-dodge-ram-2500.170255/
See if your old cap got sucked in. If not, then replace it.

 

[rule18]

Welcome to RamForum.

 

[Ken mosher]

LMAO!! Another one, this just happened to someone else lol: https://www.ramforum.com/threads/power-booster-help-2003-dodge-ram-2500.170255/
See if your old cap got sucked in. If not, then replace it.

Only thing though is my breaks work fine

 

[Daw14]

Yes huge leak

 

[HemiLonestar]

Only thing though is my breaks work fine

His BRAKES worked fine too until the booster change lol.

 

[Ken mosher]

Found this picture online from the same year and motor as mine, the smaller vacuum line goes to something. Anybody know to what? Just making sure I'm not missing anything. Because I have seen other pictures where the line is capped

 

[HemiLonestar]

LMAO......same year maybe, same engine no. The capped port is only used for cruise control on trucks that don't have fly-by-wire. You have a hemi, soooo.......

 

[Redtruck-VA]

Cap it..