LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Evap can removal

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Old May 5, 2022 | 09:26 PM
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Default Evap can removal

So I ran my 383 LT1 for about a year with the charcoal canister disconnected like in this picture. I never experienced any problems with this pictured set up. I have a more modified 385 engine now that runs on 100 octane, and was looking over the car when I remembered this(pictured). Since seeing this I have been wondering, will air get into my gas tank and damage the octane of my gas?!?!? Also purge line is back in there too. Thank you!!

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Old May 6, 2022 | 09:08 AM
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Air is not going to change your octane, moisture will hurt the fuel though if it's stored outside and rain can get in those tubes, or a spider makes a nest in it and clogs the vent .
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Old May 6, 2022 | 10:53 AM
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From: Jackstandican
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I believe K&N makes small filters that you can attach straight to the charcoal canister? Reattach that line and put a filter the line going into the engine bay.
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Old May 6, 2022 | 01:10 PM
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I put a lawnmower filter on the tank vent line.
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Old May 6, 2022 | 02:19 PM
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Originally Posted by biketopia
Air is not going to change your octane, moisture will hurt the fuel though if it's stored outside and rain can get in those tubes, or a spider makes a nest in it and clogs the vent .
thank you
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Old May 6, 2022 | 02:20 PM
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Originally Posted by SS RRR
I believe K&N makes small filters that you can attach straight to the charcoal canister? Reattach that line and put a filter the line going into the engine bay.

thank you!
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Old May 6, 2022 | 02:21 PM
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Originally Posted by Z28Roxy
I put a lawnmower filter on the tank vent line.

thank you! Do you have a picture?
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Old May 6, 2022 | 02:50 PM
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One thing often overlooked, evap system intact or deleted, is the o-ring that seals the cap to the filler neck. Heard hissing at the driver's quarter the other day, right after a drive. The ring has a multitude of cracks preventing a proper seal. I'm up in the air with finding a replacement ring of the right size and material or replacing the cap altogether with a GM factory part.
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Old May 6, 2022 | 06:16 PM
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Originally Posted by Alex-chevy
thank you! Do you have a picture?
Not the best picture trying to get around the wheel but here. The tee fitting is because I have an LS1 tank which is a little different.





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