Vacuum lines

[T3rra]

Going 2 replace the small vaccum lines on my 88 250 stock turbo.

I'm going 2 renew the lines with slicone, should I get 3mm or 4mm 
Use the rubber Y or get new T connectors? 

Haven't had any major issues. Car seems 2 be running fine. But I did notice the rubber elbow under the throttle body was split and the line discounted. Iv pumped this back in for now using some 3.2mm washer hose. 

From what I can gather from vs diagrams, that this line connects 2 a thermo valve then 2 fuel vapor purge system 
But on my car what seems 2 be the thermo valve has a blank cap on one outlet. So the vacuum line runs from the throttle body stoping at the thermo valve?


Cars been used daily sense I brought it covering 3000 miles. What sort off issues would a discontent line cause? 


Iv also noticed that the line between the Y branch setup Above the thermo valve comes free often. One branch off This Rubber Y is fitted 2 the banjo bolt ( which I believe has another feed on it 4 the boost gague in the dash?) it has the small blue brake booster in the other branch. The main line that feed this rubber Y come free. I will put a cable tie on it tmw. 

Again what issue what a vacuum leak cause here? 

If any off that makes any sense

Just been and took another look, theres no fuel purge system. Didn't think there was and explain why I was having trouble working out what was what on the digrames and should answer why theres a blank on the thermo valve?



Thanks

 

[T3rra]

Ok I went 2 rally desgin which is near me, they measured the stock rubber elbows at 4mm and so I went with 4 mm. However Iv got home and checked the vacuum hose 4 fitment, easy 2 push on but also easy 2 pull off. The hose seemes very soft. the brand is there own, which is ment 2 be same as samco but without the logo. ? I got four plastic 4mm T peaces as well. However I don't really want 2 have 2 cable tie each fitting. Should I off gone smaller? Hose is quite chunky looking. The inner diameter is about the same size as in outer stock hard vacuum line. Quite easy sleeve the old line with this. Should I swap for 3mm or just stay with 4mm ? Linsey racing lines are 5/32 which is 3.9 mm but they do sleeve the ends with another larger line.

 

[Catamax944]

I warned you about the size . They measured the rubber pieces but those are not important ,the plastic line is the standard and it's much smaller , 3mm is the way to go.

 

[T3rra]

Yes you did warn me. But I was getting many conflicting research. No one came up with a clear winner. Will be exchanging the kit for 3mm [8|] I took the 4mm 2 a friend who plays with cars a lot, he had some 3mm laying about amongst the 5 other cars on his drive. It would seem 3mm is the way 2 go. Also looks thinner and tidier. I could fit the whole 3.2 mm washer hose in the 4mm slicone hose with ease. :/ so the 3.2mm washer hose is a tight fit and the 4mm can fit over that, bit 2 much stretch and give I think for what I need.