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
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Saturday, July 2nd, 2011 AT 12:24 AM

10 Replies

Tiny
SATURNTECH9
  • EXPERT
What model van is it look on your registration card?Also what engine size do you have?
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Saturday, July 2nd, 2011 AT 12:40 AM
Tiny
NUTNUT
  • MEMBER
Chevy 10 with a V8 engine.
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Saturday, July 2nd, 2011 AT 1:10 AM
Tiny
SATURNTECH9
  • EXPERT
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.
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Saturday, July 2nd, 2011 AT 1:26 AM
Tiny
SATURNTECH9
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If the canister is hooked to manifold vacuum then hook the loose line to the brake booster check valve on the booster.
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Saturday, July 2nd, 2011 AT 1:32 AM
Tiny
NUTNUT
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Thanks, I'll keep looking.
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Saturday, July 2nd, 2011 AT 1:33 AM
Tiny
RASMATAZ
  • MEMBER
The black canister in pic-looks more like the cruise control servo-does it have a cruise control?
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Saturday, July 2nd, 2011 AT 1:36 AM
Tiny
SATURNTECH9
  • EXPERT
Your welcome.
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Saturday, July 2nd, 2011 AT 1:36 AM
Tiny
SATURNTECH9
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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.
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Saturday, July 2nd, 2011 AT 1:54 AM
Tiny
CJ MEDEVAC
  • EXPERT
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
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Saturday, July 2nd, 2011 AT 2:24 AM
Tiny
CJ MEDEVAC
  • EXPERT
PS

Looks like a vacuum reservoir to me.

The Medic
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Saturday, July 2nd, 2011 AT 2:33 AM

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