EVAP Delete
Thread Starter
Le Mans Master
Joined: Aug 2002
Posts: 8,472
Likes: 38
From: Houston TX
St. Jude Donor '11
EVAP Delete
What am I missing out on if I remove this junk from my engine bay and tune out the codes?
Follow up question: Is it possible to use the EVAP line as a return line for a return fuel system?
Follow up question: Is it possible to use the EVAP line as a return line for a return fuel system?
Melting Slicks
Joined: Aug 2004
Posts: 2,887
Likes: 221
From: Oakbank Manitoba
If you completely remove the EVAP system then you'll need to drill a small hole in your gas cap to vent the tanks. Then you run the risk of having a slight fuel smell in the garage.
The solenoid, plastic lines and canister are plastic. I just weighed the canister and solenoid at the tank, they're 4 lbs. The nylon vapor lines and solenoid at the manifold are maybe another 3 lbs.
It would be easier to just upgrade to the Z06 fuel module then to convert the EVAP vapor line to a return fuel line. You will have to drop the tanks anyways to accomplish this.
The solenoid, plastic lines and canister are plastic. I just weighed the canister and solenoid at the tank, they're 4 lbs. The nylon vapor lines and solenoid at the manifold are maybe another 3 lbs.
It would be easier to just upgrade to the Z06 fuel module then to convert the EVAP vapor line to a return fuel line. You will have to drop the tanks anyways to accomplish this.
Last edited by KENS80V; Jan 13, 2012 at 11:04 AM.
Le Mans Master
Joined: Dec 2004
Posts: 5,483
Likes: 797
From: West coast CA
Thread Starter
Le Mans Master
Joined: Aug 2002
Posts: 8,472
Likes: 38
From: Houston TX
St. Jude Donor '11
Wouldn't the evap hard line in the engine bay vent that, negating the need to drill a hole in the cap? I guess I'm not talking about the stuff in the tank, just the lines in the engine bay. I don't know why but it bugs me. Maybe it's not possible to remove that without removing the in tank stuff?
If I drop the tanks I'm putting in an aftermarket fuel system. Not ready to do that right now though.
I was kidding about the weight savings.
If I drop the tanks I'm putting in an aftermarket fuel system. Not ready to do that right now though.
I was kidding about the weight savings.
If you completely remove the EVAP system then you'll need to drill a small hole in your gas cap to vent the tanks. Then you run the risk of having a slight fuel smell in the garage.
The solenoid, plastic lines and canister are plastic. I just weighed the canister and solenoid at the tank, they're 4 lbs. The nylon vapor lines and solenoid at the manifold are maybe another 3 lbs.
It would be easier to just upgrade to the Z06 fuel module then to convert the EVAP vapor line to a return fuel line. You will have to drop the tanks anyways to accomplish this.
The solenoid, plastic lines and canister are plastic. I just weighed the canister and solenoid at the tank, they're 4 lbs. The nylon vapor lines and solenoid at the manifold are maybe another 3 lbs.
It would be easier to just upgrade to the Z06 fuel module then to convert the EVAP vapor line to a return fuel line. You will have to drop the tanks anyways to accomplish this.
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Melting Slicks
Joined: Aug 2004
Posts: 2,887
Likes: 221
From: Oakbank Manitoba
If you just left the line open in the engine bay then fuel vapors could possibly accumulate.
The vapor line goes back to the canister. Then a separate vapor line joins the canister to the tank. A solenoid is also located at the canister. That closes off the fresh air allowed into the canister when the Evap system tests itself. The ECM opens the solenoid at the engine and then looks at the vacuum produced in the fuel tank with the tank solenoid sealed off.
The vapor line goes back to the canister. Then a separate vapor line joins the canister to the tank. A solenoid is also located at the canister. That closes off the fresh air allowed into the canister when the Evap system tests itself. The ECM opens the solenoid at the engine and then looks at the vacuum produced in the fuel tank with the tank solenoid sealed off.
Melting Slicks
Joined: Dec 2002
Posts: 2,897
Likes: 0
From: Lone Star State
I'm getting a lot of pressure in the fuel tank and once I cracked the cap, pressure comes out but continuously until it cools down. Where is the canister/soleniods/valves located?
I also witness that my service fuel system comes on and my gauge reads empty..
Anyone??
I also witness that my service fuel system comes on and my gauge reads empty..
Anyone??
Platinum Supporting Dealership
Joined: Sep 2007
Posts: 4,206
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From: Houston Tx
YOULL GET A CEL BUT THAT IS EASILY TURNED OFF. I GOT RID OF MINE NO FUEL SMELL AND THE CAR IS .0001 FASTER THROUGH THE 1/4 
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Platinum Supporting Dealership
Joined: Sep 2007
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From: Houston Tx
or if your around the store somethiem stop by id be glad to show you how i did it.
Race Director
Joined: Mar 2005
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From: Austin Texas
Intermediate
Joined: Oct 2017
Posts: 41
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Would like to see what you did thanks
would like to see that diagram
Race Director
Joined: Dec 2013
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Down and dirty, with the car shut off, solenoid at the charcoal canistor is open, Forward evap solenoid closed, to allow the tank to vent pressure that way. Since the fumes are being pushed through the charcol canistor, no gas smell/no raw petrol fumes into the atmosphere.
With car on, charcoal canister solenoid is closed, and tank is venting through the evap solenoid into the intake isntead to still not vent raw gas fumes into the atmosphere.
At start up, both solenoids are help closed so the car can not only check the solenoids to makes sure they have the needed resistance to show they are connected/not burnt out, but the pressure in the system to make sure that the gas cap is not leaking as well.
As for the charcoal canister, it's above the tanks.
As for pulling the charcoal canister and evap lines, make sure to install one way check valves, so fuel is not allowed to pour out the top of tank in case of roll over.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,320
Likes: 3,927
From: Cape Coral, Florida
Down and dirty, with the car shut off, solenoid at the charcoal canistor is open, Forward evap solenoid closed, to allow the tank to vent pressure that way. Since the fumes are being pushed through the charcol canistor, no gas smell/no raw petrol fumes into the atmosphere.
With car on, charcoal canister solenoid is closed, and tank is venting through the evap solenoid into the intake isntead to still not vent raw gas fumes into the atmosphere.
At start up, both solenoids are help closed so the car can not only check the solenoids to makes sure they have the needed resistance to show they are connected/not burnt out, but the pressure in the system to make sure that the gas cap is not leaking as well.
As for the charcoal canister, it's above the tanks.
As for pulling the charcoal canister and evap lines, make sure to install one way check valves, so fuel is not allowed to pour out the top of tank in case of roll over.
Last edited by C5 Diag; Aug 8, 2021 at 07:52 PM.