EVAP Canister Delete

AssBurns

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#1
I've had my EVAP/ Charcoal Canister bypassed for some time now and just barely bulled the Charcoal Canister out so I thought I'd share how I did it. The way I bypassed it is much easier and simpler than the ways I’ve seen some guys doing it before. No tee fittings, no breather tube and still vents to your intake rather than directly to the atmosphere. Gotta keep the hippies happy
Honestly, it's just a better idea in my opinion so that fuel vapors are not just dumping out into your engine bay or outside of your vehicle. You will smell unburnt fuel sometimes out your exhaust but better than fresh gas fumes all the time.

There are only a few lines that need to be changed with this method. Basically all you need to do is locate your Fuel Tank Vent Line and unplug it from the Charcoal Canister. Locate your Vapor Purge Valve and unplug the lower hose that connects to the Charcoal Canister. Now plug the Fuel Tank Vent Line directly to the Vapor Purge Valve. Then locate the hose that runs from your Air Box to your Charcoal Canister. Pull the hose and cap the tube coming out of the Air Box. That's it! Now just unplug the pressure sensor and unbolt the Charcoal Canister to pull it all out. Easy peasy! This can easily be done without any modifications in just a few minutes, so everything can easily be put back into place when you need to pass SMOG or Inspection.


Hope this helps anyone that is looking to gain some room in the engine bay.
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Plastics Guy

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#4
@AssBurns Could a bad evap canister be why my gas tank builds up pressure and blows out the gas cap??? I need to get this problem fixed before I blow myself up

Awesome write-up, Thank you!
 

Theblackflag

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#5
Your charcoal can is a likely cause of that. I had a diaphragm go bad in my canister which caused the tank to build enough pressure on hot wheeling days that if I shut the truck off it would vapor lock the motor until I vented the tank through the cap for 20 minutes or so and there were several times it would start puking fuel out of the filler. This was also paired with an intermittent P0446 code. Tossed in a new to me canister for 70 bucks off ebay and its good as new.
 

Plastics Guy

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#6
Your charcoal can is a likely cause of that. I had a diaphragm go bad in my canister which caused the tank to build enough pressure on hot wheeling days that if I shut the truck off it would vapor lock the motor until I vented the tank through the cap for 20 minutes or so and there were several times it would start puking fuel out of the filler. This was also paired with an intermittent P0446 code. Tossed in a new to me canister for 70 bucks off ebay and its good as new.
Thanks for the info!

Good to see your on the forum!
 

AssBurns

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#7
Like @Theblackflag said. It’s probably the charcoal canister, but this won’t necessarily fix that issue since the way I have mine setup, it vents directly into the intake manifold, but with the vapor valve in between, so it only vents as much as the vapor valve is open. It only opens for a split second at different throttle positions. So sometimes it’ll build a small amount of pressure to hear it when pulling the gas cap, or it’ll be a slight vacuum. Usually it’s somewhere in between.
 
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#10
Question on this. So it will burp fuel vapor into the intake when the vehicle is off instead of being stored?

Edit:
What I'm trying to ask is what kind of valve do you put to help prevent too much vacuum or pressure in your tank?
 
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AssBurns

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#11
Question on this. So it will burp fuel vapor into the intake when the vehicle is off instead of being stored?

Edit:
What I'm trying to ask is what kind of valve do you put to help prevent too much vacuum or pressure in your tank?
I got nothing. The vapor valve stays closed when the vehicle is off. I'd like to get something that just vents on it's own into the intake, but can't just let it go straight to the intake without some sort of valve, or it'll loose intake vacuum and stall. Any ideas?
 
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#12
I got nothing. The vapor valve stays closed when the vehicle is off. I'd like to get something that just vents on it's own into the intake, but can't just let it go straight to the intake without some sort of valve, or it'll loose intake vacuum and stall. Any ideas?
For me I like the idea of a charcoal canister. It’s just in a bad spot on built trucks and it takes up a lot of room. Keeps fuel fresh if you don’t fill up much. My truck is my toy so it mostly sits. Probably could put the vent to your air box so you don’t need to deal with high vacuum pressure. Problem is if you don’t have some type of check valve it like just putting a vent to open air. So yeah I just keep going in a full circle on this topic the more I think about it.
 

AssBurns

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#13
For me I like the idea of a charcoal canister. It’s just in a bad spot on built trucks and it takes up a lot of room. Keeps fuel fresh if you don’t fill up much. My truck is my toy so it mostly sits. Probably could put the vent to your air box so you don’t need to deal with high vacuum pressure. Problem is if you don’t have some type of check valve it like just putting a vent to open air. So yeah I just keep going in a full circle on this topic the more I think about it.
Yeah I don’t mind keeping the charcoal canister. It’s just big and in the way. Plus it started to clog up, so I ditched it.
Idk if there is any good way to delete the charcoal canister without having some issues with pressure/vacuum. I haven’t had any crazy pressure yet, but definitely noticeable when you open the gas cap
 
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