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Old 10-01-2015, 01:10 PM   #1
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Gas tank not venting w/o Evap System

Hi guys, so I've tried to do everything I could think of, but for about a year now it's been slow to fill my gas tank due to the pump shutting off. I know this means it's not venting properly. When it happened I took off the front wheel well cover and tried to figure it out, only to find a nasty Evap system in there, so I deleted it thinking it might fix the problem. The hoses from the tank are open ended in the wheel well now, and I removed the valve around the filler neck. Nothing has worked. I've even blown compressed air through the lines to the tank, and eventually with enough pressure it will vent, however it still won't fill normally.
Any help would be appreciated, thanks!
2001 986S

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Old 10-01-2015, 01:13 PM   #2
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have you tried rotating the gas nozzle 180 deg so it is upside down?
The evap system part of the pollution control system. you should put it all back

Probably not a good idea to have open hoses from the gas tank venting to your wheel well
Fuel vapor = explosion danger!
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Last edited by JayG; 10-01-2015 at 01:16 PM.
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Old 10-01-2015, 01:44 PM   #3
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Yes, I have tried rotating the nozzle, but no help. And you may be correct in the unsafe fact, but it has been fine for almost two years now.
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Old 10-02-2015, 02:54 AM   #4
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An adapter similar to this one cured the filling past 3/4 problem with my 987:
Suncoast Porsche Parts & Accessories Fuel Nozzle Adapter
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Old 10-02-2015, 04:32 AM   #5
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Originally Posted by Habby73 View Post
Hi guys, so I've tried to do everything I could think of, but for about a year now it's been slow to fill my gas tank due to the pump shutting off. I know this means it's not venting properly. When it happened I took off the front wheel well cover and tried to figure it out, only to find a nasty Evap system in there, so I deleted it thinking it might fix the problem. The hoses from the tank are open ended in the wheel well now, and I removed the valve around the filler neck. Nothing has worked. I've even blown compressed air through the lines to the tank, and eventually with enough pressure it will vent, however it still won't fill normally.
Any help would be appreciated, thanks!
2001 986S
Deleting the EVAP system was never going to correct this issue, and will cause issues when going to annual inspection as the removal will cause the car to code during the I/M Readiness test.
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Old 10-02-2015, 09:01 AM   #6
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We don't have annual inspections where I live, so that's not an issue. And the issue occurs no matter the fuel level, so the part won't likely help. I suppose I could pull the filler neck and see if it is clogged... But that's a pita!
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Old 10-02-2015, 09:28 AM   #7
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On the early cars, there were two gas filling problem areas: Flexible lines in the tank it self that can move and block a one way surge flap in the filler neck, the second was the actuator that opens the same surge flap which could fail or blow out a fuse (E6), disabling the flap. There is a TSB for a Fuel Tank Hose Modification (dated 8-12-99) where: 1. Difficulty filling the fuel tank can occur if the flexible fuel hoses in the fuel tank obstruct the inner flap of the fuel filler neck. 2. Incorrect fuel gauge readings can also be caused by the flexible fuel hoses in the fuel tank, should they interfere with the travel of the fuel sending unit arm and/or float.

Couple of interesting reads:

http://www.renntech.org/forums/topic/2317-fuel-filling-problems-went-away/

http://www.renntech.org/forums/topic/5265-gas-wont-go-in-correctly/
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Old 10-02-2015, 01:24 PM   #8
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On the early cars, there were two gas filling problem areas: Flexible lines in the tank it self that can move and block a one way surge flap in the filler neck, the second was the actuator that opens the same surge flap which could fail or blow out a fuse (E6), disabling the flap. There is a TSB for a Fuel Tank Hose Modification (dated 8-12-99) where: 1. Difficulty filling the fuel tank can occur if the flexible fuel hoses in the fuel tank obstruct the inner flap of the fuel filler neck. 2. Incorrect fuel gauge readings can also be caused by the flexible fuel hoses in the fuel tank, should they interfere with the travel of the fuel sending unit arm and/or float.

Couple of interesting reads:

http://www.renntech.org/forums/topic/2317-fuel-filling-problems-went-away/

http://www.renntech.org/forums/topic/5265-gas-wont-go-in-correctly/
Is there a way to just get rid of the flap? It sounds like an engineering mishap.
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Old 10-02-2015, 01:32 PM   #9
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Never mind... I read the articles and I think I understand it. It's sort of like a check valve? Sounds like a ****************ty design though. I'll see what I can figure out. I really appreciate the help!
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Old 10-02-2015, 02:10 PM   #10
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I found this little 'thingy' hanging out in my gas filler cap access.
Any one have any ideas what it is? - maybe it has something to do with that hole below the filler tube? (although I think that's the drain hole)

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Old 10-02-2015, 02:30 PM   #11
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Never mind... I read the articles and I think I understand it. It's sort of like a check valve? Sounds like a ****************ty design though. I'll see what I can figure out. I really appreciate the help!
It is actually a very well thought out design, if that flap was not there, under hard cornering loads, liquid fuel would literally come up the filler tube and create other issues.
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Old 10-02-2015, 02:31 PM   #12
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It might be from the gas door lock plunger thingy
That hole is a drain I beleve
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Old 10-02-2015, 03:25 PM   #13
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It is actually a very well thought out design, if that flap was not there, under hard cornering loads, liquid fuel would literally come up the filler tube and create other issues.
No, I get the purpose! Great purpose! Poor design having it controlled by a solenoid. It seems there could be a more efficient way, though I'm not a Porsche engineer.

Super thanks to you, though! I found fuse E6 was blown. Over two years trying to figure it out and I never though to check a fuse for the gas filler neck... Man... I feel defeated.
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Old 10-02-2015, 05:02 PM   #14
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No, I get the purpose! Great purpose! Poor design having it controlled by a solenoid. It seems there could be a more efficient way, though I'm not a Porsche engineer.

Super thanks to you, though! I found fuse E6 was blown. Over two years trying to figure it out and I never though to check a fuse for the gas filler neck... Man... I feel defeated.
Now put the EVAP system, which never did anything wrong, back where it belongs.
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Old 10-03-2015, 09:07 AM   #15
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Now put the EVAP system, which never did anything wrong, back where it belongs.
No can-do. I cut a couple hoses. It's not gonna happen.
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Old 10-03-2015, 09:54 AM   #16
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Note to forum members:

DO NOT BUY 2001 986 S FROM Habby73
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Old 10-03-2015, 11:22 AM   #17
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No can-do. I cut a couple hoses. It's not gonna happen.
That is definitely going to reduce the car's resale value as not everyone can live without it.
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Old 10-05-2015, 07:16 AM   #18
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That is definitely going to reduce the car's resale value as not everyone can live without it.
I'm not at all worried about it, but thanks for your guys' concerns! I don't plan on selling it anytime in the near future, so it will only be my problem
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Old 10-05-2015, 08:02 AM   #19
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I guess brute force and ignorance wins out

Just messin wit ya
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Old 10-07-2015, 12:12 PM   #20
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I guess brute force and ignorance wins out

Just messin wit ya
It usually does, however I don't think so in this case.

Anybody know what actuated the flap to open? I'm guessing it's something to do with the filler neck?

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