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Fuel vent howling

mik3c
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mik3c Member

mik3c

Posted
Posted (edited)

I have a 2003 996 C4S that makes the "blowing across a coke bottle" sound from the vent hole behind the gas cap door. It happens at idle after the car is warmed up. There are no other symptoms. Doing some research, the vent hole is connected to the EVAP system.

 

I hooked up durametric- no faults found.

 

When the fuel filler flap is activated, the howling noise/ vacuum from the vent hole goes away. 

 

Found this Pelican article, but not sure if the is the problem. 

6554b6be8c0d829a8bf63ae0c82cf121_link.pn Replacing Your 996 Fuel Line Vent Valve / Bleeder Valve - Porsche 911 Carrera & 986 Boxster - Porsche 996 Carrera (1998-2005) - Pelican Parts Technical Article

WWW.PELICANPARTS.COM
If you are having trouble filling up your car with gas, your check engine light keeps coming on, or you hear a howling sound you may have a faulty fuel line vent valve.

 

 

Here is a video of the noise

733tp54.jpg?fbplay

favicon-16x16.png imgur.com

IMGUR.COM
 

 

 

Looking for tips to help diagnose and solve this issue. 

 

Edited by mik3c
  • Admin
Loren Member

Loren

Posted
  • Admin
Posted

:welcomeani:

 

There are at least two and perhaps 3 TSBs for issues will the fuel filling lines and/or vents on the C4 and C4S.

TSBs should be performed for free by your dealer -plus they should have a record (that follows your VIN) for all TSBs that have been completed for your car.

Contact your dealer and if they have not performed them that is the place to start.

 

2021-12-31_18-50-03.png 2021-12-31_18-51-02.png

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