Need some vacuum connection help
Thread Starter
Racer
Joined: Sep 2011
Posts: 414
Likes: 55
From: Humboldt county Ca
Need some vacuum connection help
New Smeding 383 Touring in 75. Quick Fuel 680 carb with PCV valve connected where brake booster was connected. Edelbrock
Performer intake with 1 vacuum connection. Right now the Brake, 400 trans and headlight vacuum are all tee'd off the single manifold port.
The brakes don't feel like normal and I have to turn the headlights on at noon to have them open by dusk at 8:45 PM. The trans works just fine.
Carb has 2 vac ports and the advance is connected to full vac.
Any thoughts on other connection options??
Stump
Performer intake with 1 vacuum connection. Right now the Brake, 400 trans and headlight vacuum are all tee'd off the single manifold port.
The brakes don't feel like normal and I have to turn the headlights on at noon to have them open by dusk at 8:45 PM. The trans works just fine.
Carb has 2 vac ports and the advance is connected to full vac.
Any thoughts on other connection options??
Stump
Le Mans Master
Joined: Jul 2006
Posts: 8,117
Likes: 104
From: charlotte north carolina
Disconnect all vacuum lines except the distributor and the headlights, and then test the headlight operation. If that's OK, reconnect systems one at a time to check for leaks. If it turns out to be a simple lack of vacuum capacity, try connecting the PVC to the air cleaner, and the brakes to the rear carb port.
Team Owner
Joined: Jun 2000
Posts: 38,923
Likes: 1,482
From: Southbound
Cruise-In II Veteran
The brake booster should be on a vacuum source by itself. The stock position was the base of the Quadra-Jet. Nothing should be using this source other than the booster.
Race Director
Joined: Oct 2008
Posts: 19,230
Likes: 1,672
From: Long Island
Brakes rear port of carb,
You can use the front vacuum port for PVC and tank Vacuum - operate headlight ... etc.
