What are you all doing with your old canister or are you all puting in 4th gen canister? Or are you going with none? I have the line just going directly to the vent line then to the tank...and i read somewhere i'm not supposed to do that.

 

Tossed it in the garbage, then plugged the line going from the old canister to the tank.

 

I just left mine in there.

 

originally pulled it out. now its just bolted in for the visual emissions test.

 

Is it actually functional? Because i thought it was controlled by the thirdgen ecm. Just wondering. I have mine out, for now, everything capped.

 

Would it be a good idea/bad idea/no difference if i ran a vented gas cap since i capped the line from the canister?

 

I just left mine in and plugged in the plug from the fourth gen harness. Works the same.

 

I tossed mine, but only because I wanted to put my air filter over in that corner.

 

I put my filter over there as well. Good place for it. I still wanted to keep the canister, so I extended the lines going to it as well as the wiring and relocated it under that black cover that covers the wasted space under the hood latch. Works out well and was easy to do.

 

anybody???

 

If u run without a canister purge setup and seal the lines off I higly recommend getting a vented cap.

I actually recommend running evap controls where the car is equipped or supports it. Deleting cause a loss in mileage. Its sole purpose is to catch vapors from the gasoline and re inject them into the motor rather than to atmosphere. Good for the planet and good for you at 2.25 for even regular gas lately.

I vote keep it intact :-)

If you delete it, block the lines off and run vented gas cap at a minimum and make sure your fuel tank vent valve is functioning properly.

later
Jeremy

 

I'll have to disagree with this statement, I don't have mine in place, the line is capped I'm not running a vented cap and getting around 25-27mpg on the highway with 3.70 gears.

 

It shouldn't affect milage on way or the other. The solinoid is only open for a few seconds at startup anyway, just long enough to draw the vapors out.

 

Letting any gas escape in a vapor form is wasting it.

U would be more efficient running it.

I never said u would get bad mileage, you will just get better mileage with it intact.

And its open a lot more than just after u start it.

Datalog some cars and you will see what I'm talking about.

later
Jeremy

 

This is another route i'm considering going. Doesn't the 4th gen LT1 have their canister in the rear of the car. Would it be possible to transplant that setup on a 3rd gen??

 

The LT1 canisters are mounted in the rear wheelwell next to the gas nozzle, I still say dump it and program it out of the PCM.

 

so then you didn't say that?



dump the thing.

 

I'm getting the same milage as a bone stock LT1 with no mods without it, there is a vent attached under the car, so vapors are going out anyway. The main reason is to purge vapors into the fuel system so it makes the car easier to start.

 

I replaced the 87 IROC canister with a new one designed for an 84. It is more of an "in and out" , but without the electronic control. I ran a vacuum hose from the right side of the Lt-1 engine over to the canister to purge out the gas vapors. The vacuum is controled by the Lt-1 engine's computer. The gas tank needs to be vented one way or another, or it would collapse with enough vacuum. The canister works so well at removing the smell of gas for our cars, why not just use it? I also wanted everything under the hood to "look " right for when it gets inspected.

 

There is no vent at the rear of any of our cars that lets gas/vapors out.

It is called a fuel tank vent valve. Name is misleading. It acts as a one way valve to let air "in" to the tank to displace the gas used so it doesnt start a vacuum and suck itself in, which they will do if they go bad.

later
Jeremy

 

Is it from an 84 or designed for an 84? I'm considering puting a canister back in, every once in a while I smell gas, annoys me a little bit.