emissions removal

[78Suburban]

there is a fitting behind my carb on the intake that has a two lines running into it. one goes into what I think is the charcoal canister, and the other maybe into the gas tank.. anyway this little fitting was loose.... I'm wondering, would my motor run ok if I just unscrewed it and plugged the manifold? I don't have to pass any emmissions tests, and I will be driving off road mostly..

 

[pauly383]

Behind the carb , on a 70's truck ?

I believe that tap is for the auto tranny modulator , and tees off for anything else that needs manifold vacuum .

 

[78Suburban]

oh, sorry for my ignorance... well, what is the thing on the firewall that the t fitting runs into?
since it was loose, should I take it off, wrap it in teflon tape, and reinstall it?

 

[pauly383]

Do you have or had a/c ? Could be the vacuum for the vents , goes into a ball on the firewall to hold vacuum .

 

[78Suburban]

yes, I have AC.. it goes into a black thing on the firewall...
If this fitting were loose, would it make my truck idle poorly?

 

[diesel4me]

yup..

ANY vacuum leak will affect the idle quality,and can cause hesitation,among other things..