78 Chevy van vacuum hose

Tiny
NUTNUT
  • MEMBER
  • 1978 CHEVROLET VAN
  • V8
  • 2WD
  • AUTOMATIC
I have a 1978 Chevy Van and there are 2 vacuum hoses coming out of a black canister under the center of the hood. The longer one connects under the carb and the other is just hanging. Where does the shorter vacuum hose go? I know it goes to the brake system because I have no brakes right now. I just have not been able to find a port to reconnect the hose.

e-mail m_erf@knology. Net
Saturday, July 2nd, 2011 AT 12:24 AM

10 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
What model van is it look on your registration card?Also what engine size do you have?
Was this
answer
helpful?
Yes
No
Saturday, July 2nd, 2011 AT 12:40 AM
Tiny
NUTNUT
  • MEMBER
  • 3 POSTS
Chevy 10 with a V8 engine.
Was this
answer
helpful?
Yes
No
Saturday, July 2nd, 2011 AT 1:10 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
I can't find a vacuum diagram for a van that old on the 10 mosel. The brake booster well have to get a manifold vacuum source meaning any the nipple below the carb throttle plates. It will be the largest of the nipples also with a check valve on the brake booster itself plugged into the booster with the hose attached to the nipple of the check valve.
Was this
answer
helpful?
Yes
No
Saturday, July 2nd, 2011 AT 1:26 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
If the canister is hooked to manifold vacuum then hook the loose line to the brake booster check valve on the booster.
Was this
answer
helpful?
Yes
No
Saturday, July 2nd, 2011 AT 1:32 AM
Tiny
NUTNUT
  • MEMBER
  • 3 POSTS
Thanks, I'll keep looking.
Was this
answer
helpful?
Yes
No
Saturday, July 2nd, 2011 AT 1:33 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
The black canister in pic-looks more like the cruise control servo-does it have a cruise control?
Was this
answer
helpful?
Yes
No
Saturday, July 2nd, 2011 AT 1:36 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Your welcome.
Was this
answer
helpful?
Yes
No
Saturday, July 2nd, 2011 AT 1:36 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
I don't see any wires going to it or a cable or linkage from it also the carb is way away from it. But he could tell us if there is any of that better then the pic.
Was this
answer
helpful?
Yes
No
Saturday, July 2nd, 2011 AT 1:54 AM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,005 POSTS
Is there vacuum present on the line?

If so, maybe it's sorta useless now (does nothing)

Stick a small bolt in it (plug it off), see if vacuum improves on your rig!

If it's live, it's just a vacuum leak right now!

The Medic
Was this
answer
helpful?
Yes
No
Saturday, July 2nd, 2011 AT 2:24 AM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,005 POSTS
PS

Looks like a vacuum reservoir to me.

The Medic
Was this
answer
helpful?
Yes
No
Saturday, July 2nd, 2011 AT 2:33 AM

Please login or register to post a reply.

Sponsored links