EVAP Canister removal

megatronz0r · Jun 9, 2023

I have a 1988 RCSB with a carbed 400 sbc. I was thinking of removing the the canister since it really doesn't do anything now. Ive read that it would be wise to keep a valve of some sort to prevent pressure building up in the gas tank. Right as of now i don't have time or the patience to drop the gas tank and run a valve along the fill tube into the bed fender. I was thinking of adding the valve into the engine compartment mounting it to the radiator core support. Is there any dangers to this or any other downsides?

PlayingWithTBI · Jun 9, 2023

megatronz0r said:
I have a 1988 RCSB with a carbed 400 sbc. I was thinking of removing the the canister since it really doesn't do anything now.

There isn't a Canister Purge Valve in the 88, just a vacuum line hooked to it from the TB.

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megatronz0r · Jun 9, 2023

I’m just referring to this canister

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PlayingWithTBI · Jun 9, 2023

megatronz0r said:
I’m just referring to this canister

And that canister is in the bottom right of the upper schematic.

Edit: the canister is filled with charcoal to help reduce the odor of gas, just leave it connected to the line going to the gas tank. YMMV

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megatronz0r · Jun 9, 2023

PlayingWithTBI said:
And that canister is in the bottom right of the upper schematic.

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I want to remove it

PlayingWithTBI · Jun 9, 2023

megatronz0r said:
I want to remove it

Have at it, if you wanna smell gas all the time under the hood...

megatronz0r · Jun 9, 2023

PlayingWithTBI said:
Have at it, if you wanna smell gas all the time under the hood...

Is there any danger in replacing it with something like this vent valve? It’s carbed I already smell gas.

Rollover vent valve

PlayingWithTBI · Jun 9, 2023

megatronz0r said:
Is there any danger in replacing it with something like this vent valve?

IDK, try it. Personally, I'd leave the Canister in place.

Schurkey · Jun 9, 2023

What's going to happen when you install a valve...and the valve closes? Think about this.

Removing the canister is nuts.

What you should be doing is connecting the canister to a vacuum source, (which may be ported, or may be manifold vacuum) so it works as designed. Think like an engineer instead of like a high-school kid.

Caman96 · Jun 9, 2023

I agree with all of the above advice. In your other thread, you say your trucks been Frankensteined. Seems like it doesn’t need anymore of that.

EVAP Canister removal

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