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Old 11-17-2010, 05:05 AM
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Default Starting Issue After Filling Up Gas

same specs as my post below,

I go put gas in the car no matter how much fuel i put in the car it wont start with out touching the accelerator up and down until it starts..
then you have to hold the gas down a bit and put it into 1st and take off or it will stall.
its got new plugs etc..
not sure what it could be?
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Old 11-17-2010, 05:07 AM
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Does this happen every time you fill it up? Does it only do it after filling up and then the issue disappears?
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Old 11-17-2010, 05:13 AM
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ya usually just when its filled up, take off and shut off car and it starts fine
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Old 11-17-2010, 08:28 AM
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Have you scanned it for codes???
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Old 11-17-2010, 09:53 AM
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might be the fuel filter
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Old 11-19-2010, 02:38 PM
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I have seen and read that this will happen where there is an issue with the fuel evaporative system.
I just had this fixed about 45 days ago.
The evap system starts in the engine bay (passenger side) and has hoses that come from a big can, pass through an electric purge valve and down the body to the fuel filler and tank.
A mechanic will want to do a pressure test to see if there is a leak or blockage.
When the system has a leak, you will generally get a CEL with some code about the evap system or a vaccuum leak.
When something is obstructed then you will get the symptom where the car will be hard to start when you have a full tank.
You can test this by only filling up about half-way and seeing if the car is hard to start or not.

In my case the car started by having problems only when the tank was full. About a month later I got a CEL about a leaking evap purge valve.
Turns out that I had a blockage in a rubber line that vents the fuel filler. This caused the issue where the car would be hard to sart.
I also got a leak in the fuel cap gasket, and this caused the CEL to come on about the purge valve.

My VW mechanic knew from my description that this was a problem with the evap lines and had it fixed in a day. Cost was for one rubber line and a new fuel cap.

Good luck.
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Old 11-20-2010, 09:36 PM
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Ok yes, I do have a check engine light on, I have just replaced the fuel filter a while ago..
I do too think its a line issue or vacumm issues as well.
It doesnt matter how much gas I put in the tank..
Do you think it could be a bad gas cap?
I know in another car I had, i had a check engine light on and replaced the gas cap and issue was solved. As for the hard to start issue I didnt have that problem in that car.
Is there anyway I can check the lines myself? Some sort of pressure test or something?
Thanks
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Old 11-20-2010, 10:18 PM
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Go to an Autozone or other auto parts store and have the car scanned for the codes. That will help point you in the right direction, rather than blindly throwing parts at it.
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Old 11-21-2010, 01:26 PM
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I am having the exact same issue ("strange situation" thread) as wjrs, and I do have a CEL on. I have changed the fuel filter recently but have not tried filling up only part way. Guess i will check to see if there is any obvious vacuum line obstruction, etc.
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Old 11-21-2010, 03:43 PM
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When you guys fill up, you stop filling the first time the handle clicks off. If you top it off it can not vent.


By top it off, I mean you fill it to the rim with Brim.
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Old 11-21-2010, 03:51 PM
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Have either of you gotten the cars scanned for codes?

Side note, when I fill up, after the first click I usually end up putting more fuel in. But its because I'm OCD about it and I like nice round numbers for payment on the pump. I usually only put in a smidge more though.
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Old 11-21-2010, 04:46 PM
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Quote:
Originally Posted by NewBeetleMechanic View Post
When you guys fill up, you stop filling the first time the handle clicks off. If you top it off it can not vent.


By top it off, I mean you fill it to the rim with Brim.
Good point. I usually "fill it to the rim," to where the handle clicks off several times. I'll try not overfilling next time and see what happens. Thanks.
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Old 11-21-2010, 04:51 PM
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Quote:
Originally Posted by cjspack View Post
Good point. I usually "fill it to the rim," to where the handle clicks off several times. I'll try not overfilling next time and see what happens. Thanks.
Please take it as a suggestion, not a cure.
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Old 05-25-2016, 10:45 PM
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Well I see its been years since this has been posted to, but why start a new thread right?

I am experiencing the issue exactly as described by the OP

It isn't even every time, and I never 'top-up' whenever it clicks, I take it out. This is a problem I have dealt with the ENTIRE time I've owned this vehicle. While I'm putting a lot of work into the car as it is, lets see if there's a simple solution to this almost non-issue.

However, could continued operation of my Beetle in this state of disrepair be the sing of, or perhaps become the cause of a much larger problem? I have some research to do, any input is highly appreciated.

Edit: I think I will ask my friend, while he is working on the car if he could perform the evap pressure test, I do have codes for a Vacuum leak
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Old 05-26-2016, 02:37 AM
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Default Starting Issue After Filling Up Gas

The N80 evap purge valve; has been known to cause this problem. Check out some of the videos and links describing; the symptoms and how they fail: https://www.google.com/search?q=vw+n...obile&ie=UTF-8


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Old 05-26-2016, 03:43 PM
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Both Smileybug and simonsi have asked the most important question here, which is, have either of you had your ECU's scanned for fault codes?, maybe I over looked your responses but I have yet to see an answer to this question.

When experiencing problems with an OBDII vehicle, the first two things that should be done are:

1. Open the hood to see if there is anything obvious going on.

2. Connect the appropriate scan tool to the vehicle, record any fault codes that are present, now begin your diagnosis of the issues.

Any other approach is a waste of time.
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Old 05-27-2016, 03:29 PM
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Quote:
Originally Posted by Too Cold NB1.8T View Post
Both Smileybug and simonsi have asked the most important question here, which is, have either of you had your ECU's scanned for fault codes?, maybe I over looked your responses but I have yet to see an answer to this question.

When experiencing problems with an OBDII vehicle, the first two things that should be done are:

1. Open the hood to see if there is anything obvious going on.

2. Connect the appropriate scan tool to the vehicle, record any fault codes that are present, now begin your diagnosis of the issues.

Any other approach is a waste of time.
So I had the codes pulled and one indicated a bad (upstrem) o2 sensor. The other is the Secondary Air Pump. When I went back under the hood the hose from the pump to the Air filter was off. I reconnected it and now the CEL is off. The car still does the same thing at fill up though. I HAVE NOT installed the 02 sensor I bought yet. What do you suggest next?
My daughter's car:
1998 NB 2.0NA
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Old 05-27-2016, 06:29 PM
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Post any codes that you found; the actual trouble code numbers, not descriptions. So far; it doesn't sound like they would cause; a hard start issue. As noted before; the purge valve has historically caused this problem, in a full tank of gas.


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Old 05-28-2016, 03:14 PM
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Good, hopefully the reconnection of the SAIP hose is the extent of that problem.

Since fault codes can be stored without triggering the CEL, I would recommend a periodic scan of your ECU so that you can catch any codes that might reappear.

As far as the oxygen sensor code, if the sensor requires replacement then I suggest that you do so with a factory VW or Bosch part "only".

One should always eliminate (via repair) all fault codes that are present in the ECU before dealing with mystery problems that are not accounted for by the OBDII system (Why this approach you might ask), I say this because often one issue creates another and repairing the known problems may eliminate others.

At the very least you will have removed fault clutter from your ECU and in the process, fixed known problems.
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