Vacuum hoses?
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Vacuum hoses?
So that last thing I am really lacking is some hose routing. I really just need to know where the hose coming from my oil cap runs and where the hose from the passenger side valve cover is meant to run...
Fleet Owner
Joined: Dec 2009
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From: NorCal
Driver's side breather cap hose connects to the base of the air cleaner. However, some have a 90° hose connection along its circumference. That's the intake side of the crankcase vapor evacuation system.
Passenger side goes to the spacer plate under the carb... the nipple is under the rear of the carb. The carb's vacuum draws out crankcase vapor and introduces it into the air/fuel charge to be burned in the combustion cycle for "cleaner" exhaust emissions.
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I just looked at the back side of my carb and there is no nipple there for a hose. I figured the passenger side fitting needed a hose to run to the air box assembly, just wanted to make sure. SO now i have to figure out what to do with that hose from the driver side vent cap...AND it is a 5.9L
Hotshot
Joined: Mar 2013
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From: Phoenix, Az.
Your driver's side chrome oil cap supposed to have a PCV in it. That hose went to original Bump's spacer plate under the carb. Looks like you have later model's carb and EGR spacer plate under carb. Either not original engine or intake,spacer ,and carb not original. This hose can also go to manifold vacuum fitting if you have one screwed in to the intake manifold. Should be 3/8" inner diameter hose PCV to fitting. Hose from r/r valve cover goes to air cleaner.
Hotshot
Joined: Mar 2013
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From: Phoenix, Az.
I see the white handle to a Automatic transmission dipstick in your pic. On automatics they had a vacuum modulator R/R of the trans. A vacuum tube went from there, along right side of trans, and up to r/r corner of the engine. Inbetween engine and firewall. From there a hose would connect to a vacuum source on the engine to get it's vacuum. Where is this hose i described hooked up now?
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In my last post I added a pic of what looks to be some kind of vacuum setup on the back side of the manifold. Look right? Is this what you are talking about?
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Hotshot
Joined: Mar 2013
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From: Phoenix, Az.
Ah. This pic came in while I was typing my last reply. YES. Take that hose and the bolt pluging it off and hook up the PCV hose to it.
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Alright. Will do. Now my intake box has 2 holes in it...one with a clearish threadded fitting in it and ther other is a hole with two notches opposite each other...just pop the hose from the r/r cover into either one? Does one need to be blocked off?
Hotshot
Joined: Mar 2013
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From: Phoenix, Az.
The hole hole with the notches sounds like that is where a plastic nipple with ears spun in to. There would be a hose made out of kraft paper from there down to a emissions charcoal fuel vapor canister. The clearish threaded one I am not familiar with. If it's the same 5/8" size as that nipple in your valve cover than use it. You wouldn't have to plug the extra hole unless you don't want any cold air entering there in a real cold winter.
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