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  #1  
Old 06-05-2018, 10:20 PM
Geminiroq Geminiroq is offline
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Vacuum Lines 79 Cherokee- what size, how much and place to buy in bulk

Hi Guys,

I was advised by a local mechanic/smog guy that my rig will not pass smog because of the conditions of the vacuum lines?

Listening to that...I figure it might be worth it to replace them but I couldn't find the sizes or how much of each size I would need to do my entire 79 Cherk.

I guess if I could buy in bulk that might save a few bucks long term and I would have extra just in case.

Any and all advice is appreciated.

Thank you,
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  #2  
Old 06-06-2018, 04:58 AM
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nograin nograin is offline
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Hard to know what he's talking about - he may not know himself.
Take some photos and post up and it will be a lot easier to tell you what is what. Also include a photo of the vacuum diagram in the engine compartment if its still there.


There's several systems that he could be refering to. Or maybe all.
PCV, at least one larger hose to the PCV valve and a much larger hose from the breather to the air cleaner.


The following will al be about the same size smaller hoses:

EGR, Vacuum lines that open the EGR valve based on temperature and throttle position.
Timing Advance, Ported vacuum lines that advance timing under light to moderate throttle for better efficiency and economy. Sometimes temperature controlled as well.
Air Intake, Opens air door or doors on the aircleaner housing.



Vapor Recovery, Various size hoses connecting vents in fuel tank and carburetor bowl to charcoal cannister. There may be a vacuum line as well depending on how it was designed to purge.


Those are all of the lines I can think of. There may be others used to control accessories like heater/defrost doors or transfer case. If so, they'll connect to a vacuum reseviour.
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Old 06-06-2018, 02:07 PM
joe joe is offline
 
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Most of the vacuum lines will be the small standard(common) size. Don't know exact ID but it's small. 1/8" or so ID? Just take one of yours, cut off and inch or so to get a clean unstretched portion and take it into any auto parts to match it up. They all have bulk vac hose and sell you as many feet as you want. It's cheap ($0.50/ft)
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Old 06-06-2018, 02:44 PM
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nograin nograin is offline
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Best I can tell, with vacuum and washer hoses, the hose size (inner diameter) is slightly smaller than the nominal hose barb size/tube size.

So a nominal 1/8" nipple uses 7/64" Vacuum/Washer Hose
and a nominal 3/16" nipple use 5/32" Vacuum/Washer Hose



This is a little different than with typical hose sizes that are nominally the same as the mating hard tube. So the fuel and vapor hoses are pretty much normal whole fractions; 3/16", 1/4", 5/16", 3/8". Fuel hose will be marked SAE 30R7 or 30R9.
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Old 06-06-2018, 03:42 PM
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tgreese tgreese is offline
 
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There's vacuum (thick wall) and windshield washer (thin wall) tubing. Vacuum tubing has to be thick to keep it from collapsing. The most common size is 5/32" ID. It comes by the foot, and you're just going to have to guess. It's not that expensive, and there's no listing of lengths anywhere. The parts book says "as needed." There is also some 1/4" vacuum line, but most is 5/32". Windshield washer tube is 1/8" IIRC. Neither of these are fiber reinforced. Fuel line has reinforcement, and can be used in place of vacuum tube, but it's quite a bit more expensive.
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Old 06-06-2018, 08:45 PM
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nograin nograin is offline
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True- original washer hose was often thinwall, and that's often not good for vacuum as you say. I've found that harder to find when I've needed it (the thinwall stuff).
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Old 06-07-2018, 04:46 PM
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rang-a-stang rang-a-stang is offline
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What I did, is grab a couple of lines off my engine that I know I have to replace, then brought them with me and went to the store to buy 6 feet of each. Then as I would either use them up or need another one, I would make a list.

I almost always buy a 6' chunk. That will cover most of the lines under your hood and leave some for later. You won't have a giant mess of lines in a box left over that you have to store, either.
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Old 06-10-2018, 10:37 PM
Geminiroq Geminiroq is offline
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Got it....thought I would go the cheap route and try to buy in bulk
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  #9  
Old 06-11-2018, 08:41 AM
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tgreese tgreese is offline
 
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Quote:
Originally Posted by Geminiroq
Got it....thought I would go the cheap route and try to buy in bulk
I expect it's not cost effective for an individual to buy in bulk. It would be a 100' spool or such - it comes on a spool. Usually you buy a length at the parts store.

Looks like RockAuto has it for 39c/ft in chunks of 6'. There's only a 10c/ft discount to buy a 50' bundle.
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Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination ATs, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
ECO Green: '15 FCA Jeep Cherokee KL Trailhawk

Last edited by tgreese : 06-11-2018 at 01:02 PM.
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  #10  
Old 06-17-2018, 07:51 AM
Mr Carts Mr Carts is offline
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See my post on this thread.
http://www.ifsja.org/forums/vb/showthread.php?t=174358
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