North American Turbocoupe Organization



Vacuum Line Sizes?
unseenturbobird Offline
Junior Member
#1
Exclamation 
Hey how's it going.

Looking to replace all the vacuum lines in my '88 Turbo Coupe. I've searched up and down on the forum and couldn't find an answer. 

Anybody know the Vacuum line sizes needed? I know there are a few different sizes. I'm trying to order hose without having to run back and forth to the parts store.

Thanks in advance.
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Jeff K Offline
Administrator
#2
Measure the ID of all the lines you want to replace and buy them from the parts store or Ebay. The OD doesnt matter. The OD of the lines doesnt matter. The thin Nylon lines can be replaced with regular 1/8" ID rubber lines.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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Rob H Offline
Member
#3
I was hoping to find the answer to this myself. I have found two ancient hoses going to the turbo that look and feel awful. I get measuring the inner diameter, and in this case these are almost certainly the original hoses. But I have a third one that looks like it might have been routed wrong, it looks to be in good shape, but with wear marks from rubbing. I thought I would replace it as well, but something about it doesn't look right.
I guess the concern for myself, or anyone else looking for this info. is that maybe at one time they were replaced with hose of the wrong internal diameter.
I saw some 1/4" diameter stuff at TSC, looked like exactly what I might be looking for. Figured I would come check here first.

Don't know if this a stupid question, but reading about people hunting vacuum leaks and watching videos etc. made me wonder:
Is there some reason why someone wouldn't just replace all the lines vs. hunting for leaks? You would be removing them at both ends so nothing hidden under a clamp would be missed. And you could forego carefully inspecting them all.
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anasazi4st Offline
Senior Member
#4
(05-02-2020, 07:36 PM)Rob H Wrote: I was hoping to find the answer to this myself. I have found two ancient hoses going to the turbo that look and feel awful. I get measuring the inner diameter, and in this case these are almost certainly the original hoses. But I have a third one that looks like it might have been routed wrong, it looks to be in good shape, but with wear marks from rubbing. I thought I would replace it as well, but something about it doesn't look right.
I guess the concern for myself, or anyone else looking for this info. is that maybe at one time they were replaced with hose of the wrong internal diameter.
I saw some 1/4" diameter stuff at TSC, looked like exactly what I might be looking for. Figured I would come check here first.

Don't know if this a stupid question, but reading about people hunting vacuum leaks and watching videos etc. made me wonder:
Is there some reason why someone wouldn't just replace all the lines vs. hunting for leaks? You would be removing them at both ends so nothing hidden under a clamp would be missed. And you could forego carefully inspecting them all.

There’s a lot of vacuum lines. There are lines that work the various vacuum doors for the EATC (if you have that), as well as a good many in the engine compartment. It would be a pretty serious undertaking to replace them all, as many are difficult to access.

I’ve replaced all the heater/coolant hoses in my TC, and that was not pleasant. So yes, replacing them all would seem to help solve the leaking issue, but it’s a bit like buying all new tires because you don’t like the road noise the present ones produce, or swapping an engine because there are minor oil leaks. Choose your battles, as I have said before.

It’s a lot of extra work that might not be needed.
Another proud dues-paying member.

1987 Turbo Coupe w/T5OD, 8.8 axle, grey smoke; most options. Got it in 1991 with 41K miles: 3 turbos, 2 heater cores, 1 T5OD full rebuild, 5 clutches, 1 head gasket, 2 Teves II ABS units, etc. later....
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Rob H Offline
Member
#5
Yes I see that now. I don't remember where I was looking but I saw a kit that supposedly came with all of the hoses you would need to replace everything. Figured I would check it out to see if maybe it listed the sizes but it didn't.
If I recall correctly it did however say that I had over 41 feet of hoses in there. When I asked the question I didn't realize there were so many I was more or less just looking at what I could see straight away by opening the hood and it didn't look like so much
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