Assume at your own risk, I'm writing this DIY with information that I have learned from the internet and have tried on my own car, I am not saying I am right and this is the solution to your problems but hopefully it can help a few people
Lets get a better understanding of what exactly our evap system is.
It consists of:
Leak Detection pump
Evap Canister
n80 purge valve
The Breakdown
The evap system is pretty much a big circle between engine and gas tank that cycles vapors. When filling gas, your tank vents through the evap charcoal canister and then out the Leak detection pump's paper filter. The leak detection pump is then connected to the vacuum reservoir located in the front drivers fender and then comes out under the power steering resevoir and then connects to the F shaped hose under the intake manifold. on the other side of the engine you have the n80 valve which is the purge regulation valve for the gas tank, one side goes to the charcoal canister and the other side goes off into a Y, one part of the Y goes to the Turbo Inlet pipe and the other part goes to the F shaped hose under the intake manifold. While the cars running the Leak Detection Pump will not vent the gas tank into the atmosphere it will cycle it back into the engine via the n80 valves readings.
Here is a diagram
1- Evap canister – Located underneath spare tire well; accessed from under the back of the vehicle click for picture
28- Line coming from gas Tank
28- Line going to n80 valve
35,18,15- Lines going to LDP
up to 2003 part # 8E0-201-801A $240.00 CAD
2004 and on part #8E0-201-801L $164.00 CAD
Replacement of the Evap canister
Remove the 10mm nuts(3) and drop the cover down. (4)
Remove 1time use hose clamp(14 in the diagram) and remove hose going to LDP
Follow instructions written on evap canister(1) on how to remove the hard lines (28). One is big with a blue seal and one is small with a red seal, use a screw driver to push in the seal ring and then jiggle out the hoses, careful not to break them!!! It may seem like they are not coming, make sure the seal things are pushed in all the way and just keep jiggling it this is normal.
Remove the 3 bolts holding in the Evap canister (2)
Switch evap canisters, screw it in (1) (check weight of your canister, heavy canisters will be clogged with fuel making it more likely this is your problem
Reattach hard lines & pull out clip things but first MAKE SURE TO CHECK THAT LINES AREN'T CLOGGED WITH CHARCOAL SOOT.(28)
Replace 1time use clamp with screw clamp and reconnect soft hose (35)
Delete the Evap Canister Thanks @capt.obvious and @kneel for the pictures
My symptoms were,
check engine light p0441
unable to fill gas at more than $3 at a time due to excess pressure build up in my tank,
(upon removal of nozzle one would hear a "psssshhh" coming from the filler hole)
caused because while filling, the tank vents thought the n80 and the evap canister and out the LDP so something was clogged in between there.
poor gas milage
after checking all my hoses, and replacing my n80 valve and still not being able to fill up I came to the conclusion that my EVAP canister was clogged.
the EVAP can delete is for people experiencing these symptoms
Turned off my check engine light lets me fill up gas fully now! (but not too full! be careful not to overfill after deleting the canister!)
Materials Required
- T fitting with two 3/4th" openings and one 1/2" opening ( or as mentioned by heyweir427 5/8 and 3/8 inside diameter )
- 1 foot 3/4 inch hose
- 1 foot 1/2 inch hose
- 2 medium sized hose clamps for the 1/2inch
- 4 hose clamps for the 3/4inch
- 13 mm wrench
- 10 mm socket
Remove the 10mm nuts(3) and drop the cover down. (4)
Remove 1time use hose clamp(14 in the diagram) and remove hose going to LDP
Follow instructions written on evap canister(1) on how to remove the hard lines (28). One is big with a blue seal and one is small with a red seal, use a screw driver to push in the seal ring and then jiggle out the hoses, careful not to break them!!! It may seem like they are not coming, make sure the seal things are pushed in all the way and just keep jiggling it this is normal.
Remove the 3 bolts holding in the Evap canister (2)
with your T fitting attach 3/4inch (28) &(18) hoses together at the sides of the T and 1/2inch to the bottom of the T (28)
Tighten hose clamps on T-fitting
Replace Nuts and cover(3)(4) You may need to add a spacer in between where the canister was
Go try and get gas and come back and give me, kneel and capt. obvious + rep if it does ! lol
quite the opposite my friend I believe running out of gas and letting the tank run dry causes vapor lock and screws up the evap system.
I have seen this on other cars too also on the boards for my V70R. Overfilling was the cause.
In your case u stated, "#
# Switch evap canisters, screw it in (1) (check weight of your canister, heavy canisters will be clogged with fuel making it more likely this is your problem"
The only way fuel gets there is from overfilling the tank.
Not saying u are wrong (but u might be) ... just wondering how the vapor-lock gets initiated in our vacuum system that is connected to the TIP with the turbo spinning there?
MODS
Do u have the Bentley or Dealership Manual & Tools it takes to work on YOUR car properly? Or...
Are u just going to continue to wing it & keep expecting manna to fall from AZ?
Apikol>Snub/Diff APR>ExhTIP-TB hoses,Stg3 AWE>DV
JHM>ShortShift-the works
Misc> 18x8x9 235/265;HSport S4 barsTT225;Bosch-F6DTC;CarbonioV2+V6Intake Inlet;HFC;Podi-P2;ATP mani;GPopK04;034mounts
SPEC>Stg3+,LWFW
STaSIS>328/305mm,40/60,SL
Personal Motto>Walk Softly Carry a Big Stick
I guess I am wrong, Evap canisters would get full from over filling, thats the only way.
However i think i have a different problem because my evap canister was really light, and it was still non functional.
last year when my abs module went my instrument cluster stopped working aswell so i would never know how fast i was going or how much gas I had.
I ran out of gas a few times and i think thats what screwed mine up.
When i removed it there was all sorts of charcoal buit up in the hoses.
So I guess there are two ways to screw your evap can.
-Overfilling
-running out of gas.
lol
Another thing you can do is to remove the charcoal canister altogether. Tie all three lines leading to it together using a big T fitting (I used a fitting made for sprinkler systems with two 3/4" barbs and one 1/2" barb on it). You'll need about a foot each of 1/2" and 3/4" fuel line and some clamps as well. Works like a charm and you won't throw any CELs.
Another thing you can do is to remove the charcoal canister altogether. Tie all three lines leading to it together using a big T fitting (I used a fitting made for sprinkler systems with two 3/4" barbs and one 1/2" barb on it). You'll need about a foot each of 1/2" and 3/4" fuel line and some clamps as well. Works like a charm and you won't throw any CELs.
i did the canister delete and i can fill up again!
a few things i noticed that should be addressed.
1. first and formost, the size of the fuel line needed is 5/8 and 3/8 inside diameter. maybe capt. o meant to say outside diameter??? or maybe my cars different, but thats what i needed.
2. you need to add spacers to the bolts that hold the plastic cover on. when you take the canister out of the equation you lose about 5/8 of an inch that needs to be made up. i added 2 over sized nuts sanwiched between the car body and the #2 bolts.
3. (just for clairity) i bought couplers to connect the new hoses to the plastic hoses that attached to the canister, which were not needed. the new hose will slip over the stock plastic hoses (#'s 28 & 18).
i dont see this in the diy section, but it really should be.
as our cars are getting older, those canisters are filling up. i didnt weigh mine, but it deffinately weighed at least 8 lbs!
i vote diy section. its a good write up as well.
i also noticed the larger plastic line coming from the filler neck was deformed/melted/caved in, from the heat of the exhaust.
i did the canister delete and i can fill up again!
a few things i noticed that should be addressed.
1. first and formost, the size of the fuel line needed is 5/8 and 3/8 inside diameter. maybe capt. o meant to say outside diameter??? or maybe my cars different, but thats what i needed.
2. you need to add spacers to the bolts that hold the plastic cover on. when you take the canister out of the equation you lose about 5/8 of an inch that needs to be made up. i added 2 over sized nuts sanwiched between the car body and the #2 bolts.
3. (just for clairity) i bought couplers to connect the new hoses to the plastic hoses that attached to the canister, which were not needed. the new hose will slip over the stock plastic hoses (#'s 28 & 18).
i dont see this in the diy section, but it really should be.
as our cars are getting older, those canisters are filling up. i didnt weigh mine, but it deffinately weighed at least 8 lbs!
i vote diy section. its a good write up as well.
i also noticed the larger plastic line coming from the filler neck was deformed/melted/caved in, from the heat of the exhaust.
Nice write up! You should state what your problem has been in the first post.
I was hoping this would fix my "Evap system: incorrect purge flow" CEL that I keep getting but it sounds like you guys have a different problem.
Nice write up! You should state what your problem has been in the first post.
I was hoping this would fix my "Evap system: incorrect purge flow" CEL that I keep getting but it sounds like you guys have a different problem.
Address 01: Engine Labels: 06B-909-518-AMB.lbl
Control Module Part Number: 8E0 909 518 AF HW: 8E0 909 018 A
Component and/or Version: 1.8L R4/5VT G 0003
Software Coding: 0016701
Work Shop Code: WSC 79160 156 468775
VCID: 74ED2ABF6E3D
5 Faults Found:
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 002 - Lower Limit Exceeded - Intermittent
16688 - Cylinder 4: Misfire Detected
P0304 - 002 - Lower Limit Exceeded - Intermittent
16712 - Knock Sensor 1 (G61): Signal too High
P0328 - 001 - Upper Limit Exceeded - Intermittent
16891 - Idle Control System RPM: Higher than Expected.
P0507 - 001 - Upper Limit Exceeded - Intermittent - MIL ON
16840 - EVAP System: Very Small Leak Detected
P0456 - 002 - Lower Limit Exceeded - Intermittent
Readiness: 0000 0000
are these your codes before deleteing the evap canister?
my code was
16825 P0441-02 Lower Limit Exceded
My symptoms were,
check engine light p0441
unable to fill gas at more than $3 at a time due to excess pressure build up in my tank,
(upon removal of nozzle one would hear a "psssshhh" coming from the filler hole)
caused because while filling, the tank vents thought the n80 and the evap canister and out the LDP so something was clogged in between there.
poor gas milage
after checking all my hoses, and replacing my n80 valve and still not being able to fill up I came to the conclusion that my EVAP canister was clogged.
the EVAP can delete is for people experiencing these symptoms, your code suggests a leak somewhere.
I would refer to the diagram posted above and check for any leaks.
note:
I can only speak from my own experiences I am not a tech and am just trying to help out! dont blame me if anything goes wrong! lol
are these your codes before deleteing the evap canister?
my code was
16825 P0441-02 Lower Limit Exceded
My symptoms were,
check engine light p0441
[B]unable to fill gas at more than $3 at a time due to excess pressure build up in my tank,
(upon removal of nozzle one would hear a "psssshhh" coming from the filler hole)
caused because while filling, the tank vents thought the n80 and the evap canister and out the LDP so something was clogged in between there.
poor gas milag
after checking all my hoses, and replacing my n80 valve and still not being able to fill up I came to the conclusion that my EVAP canister was clogged.
the EVAP can delete is for people experiencing these symptoms, your code suggests a leak somewhere.
I would refer to the diagram posted above and check for any leaks.
note:
I can only speak from my own experiences I am not a tech and am just trying to help out! dont blame me if anything goes wrong! lol
same symptoms i'm having i think my Evap Canister is clogged. Doing the Delete as i type here. Well in a few min to be exact.
Just got back from LOEWS with the parts needed.
Any pics of this DIY??? pics would be awesome.
completed and no codes so far. Need to see if i can get gas now though. But kids are still napping so, will head out later
i do have some pics to contribute.
update: got a full tank of gas with no issues. only problem was gas prices at $3.99 for 93.
lol one thing i've noticed is heavy gas smell coming from the ldp, according to Old guy these are dangerous fumes
i too was hit with the high price of gas making me wish I my evap canister was still clogged lol
awesome pictures will add to the diy later today
lol one thing i've noticed is heavy gas smell coming from the ldp, according to Old guy these are dangerous fumes
i too was hit with the high price of gas making me wish I my evap canister was still clogged lol
awesome pictures will add to the diy later today
i havent noticed the gas smell. My car stinks anyway with the evap leak and no CAT. Running the TP, not to worried if my car smells more.......as long as its not interior smell.
i havent noticed the gas smell. My car stinks anyway with the evap leak and no CAT. Running the TP, not to worried if my car smells more.......as long as its not interior smell.
added the pics and gave you credit! thanks again! I think it's almost time to contact moderator to see if we can get this in the tech diy's
where T fitting with two 3/4th" openings and one 1/2" opening can be bought? And does it have to be made from a special material or can it be just regular plastic?
^Home Depot or Lowes and I bought a plastic T but a metal T can be found. This fix actually works! 2 years of fill up woes on my B6 are finally over!! The odd thing is, the canister wasn't full of gas but it must be clogged up with something...
2005|A4 3.0 Quattro UltraSport
2006|A4 Avant 2.0T Quattro S-line
Having a strange issue and was pointed this direction. When I turn my car off, I hear this sound from under the car.
Originally Posted by jimrobbington
Was told it could possibly be the gas tank having soooooo much pressure it is actually expanding to normal shape. I also have a cel, I will try to find out the code. Hoping it's the evap canister.
Last edited by jimrobbington; 09-15-2011 at 09:03 AM.
bumping this up to see if JimRobbington found any sort of resolution. I have been having trouble filling and am now getting the same popping noise as yourself. I plan to pull everything apart this weekend, but it would be nice to have direction to head in before hand.
Expenses in F1 have gone down since the 1960s because teams don't need an extra pit crew to help the driver carry around his balls when he is not in the car.
bumping this up to see if JimRobbington found any sort of resolution. I have been having trouble filling and am now getting the same popping noise as yourself. I plan to pull everything apart this weekend, but it would be nice to have direction to head in before hand.
Well, good thing I subscribed! Don't tear anything apart just yet. N80 fixed the gas tank crunkling sound immediately, cel went away, and I felt a slight jump in performance. It did not however fix the gas pumping situation, but I can live with that.
Expenses in F1 have gone down since the 1960s because teams don't need an extra pit crew to help the driver carry around his balls when he is not in the car.
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Originally Posted by The Business
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