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Old 08-22-2022, 06:59 PM   #1
steve aleve
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Gas Smell + Venting/Filtering Options: Charcoal Canister?

I have completed a 5.3 Vortec LS swap and have a potent gas smell that is present when the truck is parked in the garage. I have installed a tank and an LS line kit from Tanks Inc that has a vent line to a rollover valve. I am planning on using a non-vented gas cap because of this, but was wondering if anyone has added a charcoal canister to their system (without tying it into the CPU?) If so, does this help? Are their other considerations or dangers to doing this? Thanks in advance! Steve
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Old 08-23-2022, 09:57 AM   #2
Willie Makeit
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Re: Gas Smell + Venting/Filtering Options: Charcoal Canister?

the tank isn't pressurized, only the fuel lines. my guess is vapor is "seeping" thru the walls of the rubber lines. i replaced all "box store" rubber fuel line with Earl's VaporGuard line and have had no issues since.
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Old 08-23-2022, 12:21 PM   #3
steve aleve
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Re: Gas Smell + Venting/Filtering Options: Charcoal Canister?

Quote:
Originally Posted by Willie Makeit View Post
the tank isn't pressurized, only the fuel lines. my guess is vapor is "seeping" thru the walls of the rubber lines. i replaced all "box store" rubber fuel line with Earl's VaporGuard line and have had no issues since.
Thanks for the info, I was hoping that the Press Lock LS line kit that came from Tanks Inc wasn't the same line as the box store lines but seems I may need to replace it wit something like Earls.

Thanks
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Old 08-25-2022, 02:58 PM   #4
racecougar
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Re: Gas Smell + Venting/Filtering Options: Charcoal Canister?

It looks like that kit utilizes rubber hose (from Russell). Fuel permeating the hose is likely the source of the odor. I recommend moving to a PTFE-lined hose, like Russell PowerFlex.
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Old 08-26-2022, 07:21 AM   #5
Joyridin
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Re: Gas Smell + Venting/Filtering Options: Charcoal Canister?

I had that situation in my other car. A sealed gas cap and a cheap charcoal canister and the smell has never comeback.
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Old 09-02-2022, 08:15 PM   #6
Blazerowner
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Re: Gas Smell + Venting/Filtering Options: Charcoal Canister?

I wanted to revive this thread as I am wanting to run a canister. All my lines are PTFE and I have an LS3 swapped. I have not ran the truck yet, but it will sit in my shop with my gym so I don’t want any smell. I was wondering if I ran a charcoal canister should I have it attached to the intake somewhere to evacuate it? If yes, can it be done with a simple vacuum while it is running? Can it cause any fuel issues? I don’t want to mess with a solenoid either as I don’t believe my Holley ECU can control it. I have seen others say yes, but I wanted to see if anyone had this setup with good results.
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Old 09-14-2022, 12:39 PM   #7
1972CST
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Re: Gas Smell + Venting/Filtering Options: Charcoal Canister?

I am running an 87 efi tank in my 72 K5, 5.3 swap and I used a charcoal canister from a late 90's Tahoe and just ran my tank vent line into the fitting marked "tank" I believe. It seems to work fine for me. My fuel cap is sealed.
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