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Old 06-11-2003, 04:25 PM   #1
kaos200
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Default Fuel Vapor can (under rear of car)

Whats the main function of it? how it work, hows it plumbed etc?
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Old 06-11-2003, 05:47 PM   #2
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Peaty posted this once...


Quote:
It filters the gas fumes that will end up in the atmosphere or vented back that get vented from your gas tank. I think it's the Carbon filter cannister. There is a check valve in the filler neck so you don't get gas down in it but if you force it it can happen. This is why they say don't add anymore gas after the pump stops pumping. I usually do anyway but not a lot more, just to round off the price.
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Old 06-11-2003, 07:49 PM   #3
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right but what if you wanted to bypass it to remove the canistor etc.
there are two primary lines feeding the whole system, and the system has two solenoids of some sort.
What I DO know, is if you plug both those main lines, the tank gets pressurized and you cant fill up because the pump thinks the tank is full. I just need to test and see which.

If you leave both lines open, you leak vapor and your mileage goes down the $hitter it seams.
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Old 06-11-2003, 07:55 PM   #4
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The solenoids are controlled by the ecm to let the fume go into the engine at certain time. If you disconnect the hose you might get an EVAP code with your check engine light lit.
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Old 06-11-2003, 08:11 PM   #5
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Quote:
Originally posted by Avenger
The solenoids are controlled by the ecm to let the fume go into the engine at certain time. If you disconnect the hose you might get an EVAP code with your check engine light lit.
lol, not too worried about the cel.

Basically, how should I route those two lines to just bypass the can? Which of the two solenoids can I put between the lines to do what I need at the right time?
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Old 06-11-2003, 10:12 PM   #6
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Heh, I have no idea on the answer, but I'm going to get a close look at that bastard tomaro... I have to run fuel lines across the top of the tank to the new secondary system because there are too many snags when you try to run it with a hanger or something (doh!). Good luck!
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Old 06-11-2003, 10:17 PM   #7
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hehe cool
I want to remove it because I hate adding weight to the car so when I added the fuel surge, I figured that could go
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Old 06-12-2003, 04:50 AM   #8
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just finished discussing this with a friend on the boards (thanks dood!)
and Im going to try a check valve on the smaller line under the car, bleeding out, stopping anything getting in. It just sucks that Im losing fuel to the atmosphere

And once I have sunlight Im going to see exactly where the fatter line goes, possibly just to atmosphere.

I removed the fuel vapor purge into my intake manifold, being that Ive had an inconsistent idle at times, this may solve that problem (we'll see)

Damn, and I told myself Id never be a guinea pig again... LoL
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Old 06-12-2003, 05:22 AM   #9
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Hell, if you're going that far, you might want to try a pressure-relief valve... something that opens after a certain pressure only.

Go to www.mcmaster.com and enter "pressure relief valve" in their search and check the page that comes up. Possibly the one at the bottom may work the best... it's the cheapest and can be set very low.
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Old 06-12-2003, 02:27 PM   #10
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im going to do just that

to top it all off I just found a 3rd small hose, comes off the fuel tank filler (leads to gas cap), Im going to use the pressure release on this one and cap the other two, and just try different setups until I find what the car likes
Kian
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Old 06-13-2003, 01:23 AM   #11
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change of plans, looks like the pressure release is going to go on the middle or largest of the 3 hoses, with a check valve on the third tiny one (air in, not out)
since the tank wont fill with those two plugged (I think its probably the middle one)

Question is, what should the valve be set at to release?
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Old 06-13-2003, 06:46 PM   #12
Sunrise City Rider
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Quote:
Originally posted by kaos200

Question is, what should the valve be set at to release?
Atmospheric Pressure???

15psi?

Zee
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Old 06-13-2003, 07:09 PM   #13
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Hey Kian, excuse my ignorance, but what are you trying to accomplish with this project? I thought the vapor canister just collected the gasoline vapor and allows it to condense back into liquid which is then fed back into the fuel system. Is this not just an emmissions thing to prevent HCs from being released into the atmosphere?

I don't understand how you would gain performance by removing this device.

Please enlighten me.

Word.

-Milan
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Old 06-13-2003, 07:58 PM   #14
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the answer to your question is simple, what can you do to your car to make it faster without adding power?
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Old 06-13-2003, 08:23 PM   #15
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thanks to a nice board member I have the diagrams of the entire system when driving and when fueling, if anyone can host it, let me know Ill email it
thanks Greg!
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Old 06-13-2003, 08:27 PM   #16
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Quote:
Originally posted by kaos200
the answer to your question is simple, what can you do to your car to make it faster without adding power?
Always drive downhill.
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Old 06-13-2003, 08:52 PM   #17
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Quote:
Originally posted by ShadowIMg


Always drive downhill.
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Old 06-13-2003, 09:00 PM   #18
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Quote:
Originally posted by kaos200
the answer to your question is simple, what can you do to your car to make it faster without adding power?
Weight reduction...but how much does that little plastic can weigh? Is it really worth the trouble?
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Old 06-13-2003, 09:09 PM   #19
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Quote:
Originally posted by US2JDM


Weight reduction...but how much does that little plastic can weigh? Is it really worth the trouble?
I dont claim to know the answers to such questions
"I just do it"


OK so back ontopic, who wants to host the pics ?
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Old 06-14-2003, 12:44 AM   #20
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Quote:
Originally posted by kaos200

I dont claim to know the answers to such questions
"I just do it"


OK so back ontopic, who wants to host the pics ?
Indeed. Hopefully you can weigh it when you do get it out, so we'll all know.

E-mail kym, she'll host 'em.
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Old 06-18-2003, 06:07 AM   #21
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kaos200, mind shooting the pics my way? j.horowitz@sbcglobal.net . Thanks
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Old 06-18-2003, 06:14 PM   #22
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Unpluging it will vent alot of the gas into the atmosphere. A problem for tree huggers, but the biggest problem for you and I, is that alot of the gas will evaporate away from the tank if you uplug that cannister and leave the lines open. So dont do it. You'll be wasting alot of gas, especially on hot days, and your wallet won't thank you for it.

Mark,
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Old 06-18-2003, 10:02 PM   #23
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Quote:
Originally posted by EJ22T
Unpluging it will vent alot of the gas into the atmosphere. A problem for tree huggers, but the biggest problem for you and I, is that alot of the gas will evaporate away from the tank if you uplug that cannister and leave the lines open. So dont do it. You'll be wasting alot of gas, especially on hot days, and your wallet won't thank you for it.

Mark,

Thats why Im trying to figure this out...


So far, Ive plugged the large line, but NOT the little T fitting on the same line a few inches back.
Ive installed a check valve on the line from the filler pipe (air in, but not out)

and left the 3rd line open for now (will put the pressure relief in tomorrow to test it when I fill up)
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Old 06-22-2003, 04:06 PM   #24
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Quote:
Originally posted by kaos200



Thats why Im trying to figure this out...


So far, Ive plugged the large line, but NOT the little T fitting on the same line a few inches back.
Ive installed a check valve on the line from the filler pipe (air in, but not out)

and left the 3rd line open for now (will put the pressure relief in tomorrow to test it when I fill up)
Ok so that didnt work, kept stopping the pump

I placed the pressure release valve on the largest hose, plumbed the line from the fill neck into the T that goes INTO the largest hose, and let the middle line open, gonna see how this goes tomorrow

Ive never looked forward to filling up so much


CAN SOMEONE HOST THE PICS IVE SENT THEM!

PSS the plastic box and all the parts with it are NOT light..
about 8-10pounds

Last edited by kaos200; 06-22-2003 at 04:19 PM.
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Old 06-22-2003, 04:15 PM   #25
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Quote:
Originally posted by kaos200
PSS the plastic box and all the parts with it are NOT light, I can even feel a difference in handling because the weight from the back is gone!
Good information there... didn't expect that box to be too heavy. What do you think it weighed out at?
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