March 13, 2004I dont know if this is the right spot to put this, but anway, my 69 chevy has a vacuum canister(thats what someone told me it was called), which is just sitting there with nothing hooked to it. What hooks up to it?, I was thinking a vacuum line?., if so where are the vacuum lines located?, and which one of them hooks up to the canister?. Thanks in advance.
Forums : Engines-Gasoline : Vacuum canister on 69 chevy? (294 Views)
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March 13, 2004Believe it or not, its emmisions crud! Its used in series with your carb, and your gas tank to stop fuel vapor from escaping into the air.
Basically its a charcoal filled canister thats used for storing fuel vapor till it can be burned at a later time. It should be connected to your carb, Intake, and fuel tank.
Most modern day sytems are alot more complicated, but considering the year of your truck..it shouldn't be all that involved to hook it up and make sure eveything is working.
The easiest way would be to get a Manual for your truck, and follow the vacumm diagram they have for your model and engine.
March 13, 2004Yes, they are used for emissions.
I had one I put in a 1981 Firebird. I had just dropped in a new motor from Racing Head Service in Memphis, and the cam I had installed caused a low vacuum for the power brakes. The canister helped resolve the problem.
March 13, 2004On the older trucks on the radiator support was a label that showed the vacuum lines routing. If you can get a shop manual you might find the map in it.
March 13, 2004I just want to clarify what he is talking about.
A vacume canister is used in vehicles that have somewhat radical motors or require a stored vacume supply to operate a number of different options such as power brakes or vacume operated climate controls as well as vacume assited wipers.
A charcoal canister is used to collect gasoline fumes..they were used to keep the inside of cars back then from smelling like gasoline. Today's cars use a Evap system with a sealed fuel cap to collect the fumes and send them back to the tank.
Vehicles with radical cams will sometimes have a vacume canister because the motor wont make enuff vacume at idle to run things like the vacume advance on the distributer or the vacume controled secondary jets on some 4 barrel carberators, not to mention things like power brakes.
I wasn't sure about which he was asking about.....
March 14, 2004the vacuum canister on my trucks are usually on or near the wheel well, and i thought that controled the heater switch on the inside of the truck, ive never had to mess with it so i cant remember where the lines go
March 14, 2004I have 1 on my truck, with a high lift solid cam my brakes didn't work their best. Now they work great. 1 line comes in from the vacuum on the intake manifold and the other line goes to the power brake booster