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#1 Vacuum system diagram
Posted: Tue May 12, 2026 4:11 pm
by ianb
Hi,
I have a E-Type S3 V12 manual, just finishing a rebuild and desperately need a diagram of the small vacuum hoses that run from the thermo switch to the carbs, intake manifold, distributor etc. any help would be greatly appreciated.
Thank you
#2 Re: Vacuum system diagram
Posted: Wed May 13, 2026 1:57 pm
by lowact
There are 5 versions of the thermostatic vacuum system illustrated in the spare parts manual. This copy is in the "E-type Knowledge Base" on this forum:
https://www.dropbox.com/s/xoy273abhzmg1 ... l.pdf?dl=1
#3 Re: Vacuum system diagram
Posted: Wed May 13, 2026 6:11 pm
by Craig Balzer
as colin stated, there are 5 versions of the plumbing for the thermostatic vacuum system.
This photo is of the version that is appropriate for my 72 S3 (UC 1S20954 with engine number 7S7765 SB). Note the post-it that IDs the letter identifiers on the thermostatic vacuum valve. I assume it to be the same of all variations of the thermostatic vacuum system.
Hope this helps

#4 Re: Vacuum system diagram
Posted: Sat May 16, 2026 12:29 pm
by ianb
Thank you Craig and Colin,
My shop manual has one of the diagrams but not the others, looks like between them I can work it out.
I appreciate the help
Ian.