12-22-2017, 10:23 AM | #1 |
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EVAP Line???
What are you guys doing with the EVAP line that runs from the gas tank?? As a follow on,,, is it just a vent line from the tank or are there other mechanicals on the tank end??
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12-22-2017, 10:28 AM | #2 |
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Mine's just disconnected dangling in the engine bay. Never quite figured out if this is bad thing but it's been that way for years now.
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12-22-2017, 10:37 AM | #3 |
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I was told to cap it. So I cut and crimped it at the back of the car. Kind of hoping that isn't my fueling issue
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12-22-2017, 11:13 AM | #4 |
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I took the metal line out all the way back to the canister...I haven’t quite figured out what I’m going to do with it yet. I need to figure out how the factory system is vented.
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12-22-2017, 02:32 PM | #5 |
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Glad I'm not alone on this. In reviewing the diagrams below,,, wish I'd of pulled the purge valve off the motor before I sold it.
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12-27-2017, 12:59 PM | #6 |
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Last edited by rob 2fast4u; 12-27-2017 at 01:12 PM. |
07-21-2018, 07:46 PM | #7 |
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Any news on this?
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09-17-2023, 06:35 PM | #8 |
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bringing this thread to life... in a engine swqp situation with no OEM ecu.
how to vent properly ..etc maybe some check valves ? im suspecting I killed my oem fuel pump because of some issue with this system
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09-17-2023, 07:28 PM | #9 | |
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Quote:
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09-17-2023, 09:15 PM | #10 |
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Mine is vented, I believe. I haven't seen a problem with anything.
There are valves in the system that should open with pressure or are always open. The EVAP/ECU system closes the vent valve/solenoid and opens the EVAP solenoid under the intake manifold to suck fumes into the intake manifold when it senses pressure build, normally. It doesn't do this with the car off, so the gas cap should hiss from pressure buildup. Without the ECU, I believe the system is open and should vent, or it should vent at a certain pressure when a valve receives a certain pressure. You could drop the tank and remove the system and vent it if you want.
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09-17-2023, 09:22 PM | #11 | |
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Quote:
The gas cap is vented? I saw a thread were the filler tubes collapsed big issues---so the gas cap should hiss from pressure buildup.--- I wish I knew this for sure...searched everywhere cant find info on this unfortunatly ---Without the ECU, I believe the system is open and should vent, or it should vent at a certain pressure when a valve receives a certain pressure.-- I would be willing to install check valves on lines and remove the whole EVAP thing under the car but dont know which lines are which... its definitly not the most exciting part of a build but the most dangerous one I hear...
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09-17-2023, 09:30 PM | #12 | |
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09-17-2023, 11:24 PM | #13 | |
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Quote:
The gas cap has a seal, so it doesn't vent, but it will hiss letting out pressure when you open it if the car is off and the system doesn't have a way to vent pressure on the stock system. I can't remember if there is hissing now with the system vented to atmosphere, but it isn't big or louder, so that tells me the tank is venting, if not all the time, then when pressure exceeds that of the valve if it is mechanical in nature. Again, I'm not really concerned about it, as it doesn't seem to be an issue.
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