Re: [DML] Changing out vacuum hoses ---> Thermal Vacuum Switch --where e
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Re: [DML] Changing out vacuum hoses ---> Thermal Vacuum Switch --where exactly is it?

Just an update to my query...

With a little help, I now realize where the Thermal Vacuum Switch 
exactly was.  Will require me to remove the air induction / fuel 
distributor assembly to complete the vacuum hose renewal.  Saving this 
for the end of the driving season, since I have my D running pretty good 
right now.  I plan on doing a little TLC "while I am in there"... clean 
up the valley of death, replace the Thermal Vacuum Switch, who knows 
maybe even renew the fuel lines from the distributor with those nifty 
stainless braided ones...

Wayne / VIN#2447

Wayne Wagner wrote:

>After seeing the state of some of the vacuum hoses when trying to hunt 
>down a vacuum leak, I decided it was time to replace them.
>Got around to changing most of the hoses today with the kit from 
>SpecialTauto, and when I got to the Tee that joins the constant pressure 
>regulator to the Thermal Vacuum Switch..... I find another Tee further 
>along the path!
>I don't know why the system was mis-"hosed" the way I found it.  What I 
>see is a vacuum hose from manifold to a Tee that supplies vacuum to the 
>Vacuum Advance solenoid switch and the pressure regulator. 
>Apparently the Thermal Vacuum Switch is totally bypassed, and I am not 
>sure how deep I am supposed to dig to see it.  I have an idea where it 
>supposed to approximately be from the manual, but I still cannot see 
>it.  Any tips?
>Also, are there any negative aspects to running vacuum to the fuel 
>pressure regulator all the time?  From what I understand... the Thermal 
>Vacuum Switch should cut out vacuum to the pressure regulator when the 
>engine is above +40C.

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