Rennlist Discussion Forums   classifieds | membership | rennlist | photo album    
sponsors | upload photo | chat    
 
Go Back   Rennlist Discussion Forums > Water Cooled Technical Discussion Areas > 924/931/944/951/968 Forum
Sign in using an external account
Register Forgot Password?
Search

Reply
 
Thread Tools Search this Thread
Old 06-02-2010, 04:11 PM   #1
Dryslick13
User
 
Dryslick13's Avatar
 
Join Date: Apr 2010
Location: Western Slope of CO
Posts: 325
Default Gas smell, where is it coming from?

When driving my car hard in corners (especially up hills) I get a faint scent of gas. I pulled over after doing a series of s's and tried to find where it was coming from. I opened the hatch, fuel cap door, looked under the car and there is no sign of leak or smell. Any idea where it might be coming from?
To remove this ad, register today or login if you already are registered!

Dryslick13 is offline   Reply With Quote
Old 06-02-2010, 04:22 PM   #2
John_AZ
Proprietoristicly Refined
Rennlist Member
 
John_AZ's Avatar
 
Join Date: Oct 2001
Location: ~Carefree Highway~
Posts: 1,629
Default

Your overflow or lines to the Charcoal emissions canister are cracked.

Follow the lines as far as you can from under the car and you will see they become hidden between the rear deck and top of tank.

First check the fuel pipe down to the fuel tank. Pull the carpet and remove the metal sheild. Have some Black Rubber Silicone (WalMart) to reseal. Check the clamps and hoses.

Solution??? If not the fuel pipe?

Drop the tank and replace the hoses. OH, the transaxle is lowered first.

GL
John
__________________
1988 924S 70K 6/2014+ 1987 924S 129K DD
1970 914 1.7 + 1977.5 924 + 1979 924 +++===Gone, past tutors
John_AZ is offline   Reply With Quote
Old 06-02-2010, 04:48 PM   #3
tomv944
User
 
tomv944's Avatar
 
Join Date: Nov 2009
Location: columbus Ohio
Posts: 207
Default

Sorry I am a bit of a novice mechanic but I had the same fuel smell in my S2 Cab. Could not find a leak anywhere and nothing on the ground. ( I drove it hard noticed the smell and the parked over a sheet of brown paper) Nothing. I then took out the carpet from the trunk and removed the meshy sticky pad and then removed the black cap over the fuel sender. The fuel sender sits in the top of the tank in a quite large depression that hold about a cup of gas. Mine was about 1/3 full and the round metal pipe coming out of the top was the culprit. I took some high quality silicone and resealed where the pipe come out and the smell is no gone
tomv944 is offline   Reply With Quote
Old 06-02-2010, 05:08 PM   #4
mhr
Addict
Rennlist Member
 
mhr's Avatar
 
Join Date: Dec 2009
Location: Montreal, Quebec, Canada
Posts: 949
Default

I sometimes have a fuel smell in the trunk of my cab. will be doing as described by tomv944 this weekend.
__________________
91 944 S2 Cab
15 VW Passat TDI Sport (my new DD)
10 VW Golf Wagon (wife's)
09 Cannondale SIX
mhr is offline   Reply With Quote
Old 06-02-2010, 05:48 PM   #5
Keaton944
User
 
Keaton944's Avatar
 
Join Date: Mar 2010
Location: Clarksville, AR
Posts: 125
Default

i have one but only when i fill the tank up to 3/4 or more, any ideas on it?
Keaton944 is offline   Reply With Quote
Old 06-02-2010, 07:16 PM   #6
tomv944
User
 
tomv944's Avatar
 
Join Date: Nov 2009
Location: columbus Ohio
Posts: 207
Default

Keaton that is when I had the problem also.
tomv944 is offline   Reply With Quote
Old 06-02-2010, 07:17 PM   #7
tomv944
User
 
tomv944's Avatar
 
Join Date: Nov 2009
Location: columbus Ohio
Posts: 207
Default

MHR let me know what you find
tomv944 is offline   Reply With Quote
Old 06-03-2010, 02:28 PM   #8
SalzundPfeffer
User
 
SalzundPfeffer's Avatar
 
Join Date: Jul 2007
Location: Des Moines, IA
Posts: 126
Default

I am in the same boat as Keaton and tom. This is pathetic, and I probably look really stupid doing it, but I listen to the sound of the fuel going into my tank during filling. When I hear gurgling in the filler pipe, I know the tank is nearing full and I stop fuel. I never actually get the tank 100% full because my car ends up smelling like a bomb.

I know my car now, so I put around 250 miles on it per tank and only put around 10 gallons in it. This technique usually keeps the smell to a minimum.

I pulled the carpets in the back and tried to seal everything up again. I didn't pull the cover on the inside of the trunk that goes to the filler line. I suspect this is cracked and needs to be replaced...
SalzundPfeffer is offline   Reply With Quote
Old 06-03-2010, 02:40 PM   #9
Carrera51
Addict
Rennlist Member

Rennlist
Site Sponsor

 
Carrera51's Avatar
 
Join Date: Nov 2001
Location: Keswick, VA
Posts: 2,537
Default

I had the same problem in my old 83. It wasn't around the sender on top. I wouldn't have the issue if I only filled to about 3/4 full at gas stops. The mechanic thought there could have been a hairline crack at the top of the tank. I lived with it since the cost to replace the tank plus the labor was awfully high. This was 11 years ago so I don't remember the exact number.
__________________
Mark
OG Racing
www.ogracing.com
800.934.9112
Nationally Trained PCA and NASA Instructor
PCA Club Racing National Sponsor since 1998
Performance Friction, Pagid, Hawk, Alpinestars, OMP, Sparco, Bell, Racetech, HANS, Arai, AIM, and more, in stock!
Carrera51 is offline   Reply With Quote
Old 06-03-2010, 03:17 PM   #10
John_AZ
Proprietoristicly Refined
Rennlist Member
 
John_AZ's Avatar
 
Join Date: Oct 2001
Location: ~Carefree Highway~
Posts: 1,629
Default

This is a complete thread on tank cracks.

http://forums.pelicanparts.com/porsc...eaks-read.html
__________________
1988 924S 70K 6/2014+ 1987 924S 129K DD
1970 914 1.7 + 1977.5 924 + 1979 924 +++===Gone, past tutors
John_AZ is offline   Reply With Quote
Old 06-03-2010, 04:21 PM   #11
Richgreenster
User
 
Richgreenster's Avatar
 
Join Date: Mar 2008
Location: Too far from the track!
Posts: 955
Default

I had an old 1983 that was doing the same thing a few years back. I changed all of the fuel hoses to the charcoal canister, then the rear hatch seal. This helped some but never fully fixed the problem. People swore that it was the canister because every time I would fill the tank full the problem got worse. It was not until I replaced the catalytic converter with a new one that made the smell go completely away. It was like having a new car again.
Richgreenster is offline   Reply With Quote
Old 06-04-2010, 01:13 AM   #12
luftpirate
User
 
luftpirate's Avatar
 
Join Date: Feb 2007
Location: Zinzinnati, Ohio
Posts: 638
Send a message via AIM to luftpirate
Default

Quote:
Originally Posted by Richgreenster View Post
I had an old 1983 that was doing the same thing a few years back. I changed all of the fuel hoses to the charcoal canister, then the rear hatch seal. This helped some but never fully fixed the problem. People swore that it was the canister because every time I would fill the tank full the problem got worse. It was not until I replaced the catalytic converter with a new one that made the smell go completely away. It was like having a new car again.

How can the canister in the front cause fumes to appear in the back?

Is maybe what's happening is that the canister gets clogged so then pressure/fumes find there way out somewhere in the back if theres a small leak?
luftpirate is offline   Reply With Quote
Old 06-04-2010, 01:16 PM   #13
Don 944 LA
Addict
Rennlist Member
 
Don 944 LA's Avatar
 
Join Date: May 2004
Location: Downtown Los Angleles & Denton TX
Posts: 1,842
Default

cracked tank
__________________
Los Angeles / Denton Texas
944 85.0 Kalahari Beige (dead,gone, but not forgotten)-Ran like a Raped Banshee
944 86 Guards RedTowed/LOST
Current Stable
951 TURBO 944 86 Guards Red- Lovin the Turbo !!
944 83 Kalahari Beige, manual rack, short 5th gear Driveway Art
1998 Land Rover - Range Rover HSE Black - Showroom Cond
Don 944 LA is offline   Reply With Quote
Old 06-04-2010, 03:52 PM   #14
tomv944
User
 
tomv944's Avatar
 
Join Date: Nov 2009
Location: columbus Ohio
Posts: 207
Default

That is what I thought as well on mine. It only did when the tank was over 3/4 full. One weekend I had some time and filled the tank went driving on some twisties and came home and pull the carpet out of the trunk, pulled the sticky pad and the black cover and the depression in the tank was almost full of gas. I could see the round metal pipe coming out of the fuel gauge sending unit (I think that is what it is ) was loose so took silicon and resealed it and no more smell at all
tomv944 is offline   Reply With Quote
Old 06-04-2010, 06:50 PM   #15
Richgreenster
User
 
Richgreenster's Avatar
 
Join Date: Mar 2008
Location: Too far from the track!
Posts: 955
Default

Quote:
Originally Posted by luftpirate View Post
How can the canister in the front cause fumes to appear in the back?

Is maybe what's happening is that the canister gets clogged so then pressure/fumes find there way out somewhere in the back if theres a small leak?
Over filling the tank with gas will cause the charcoal canister to become saturated with gas. When the car is running, the cars intake system will pull the fumes/gas from the charcoal canister into the system causing the car to run very rich.. This is how the system is suppose to work with the exception of getting actual gas into the canister due to overfilling it. If a Catalytic converter is old and not working up to par, then you will have unburnt fuel out of the rear of the car.

So two things will help this out.
1. Don't over fill a 944
2. Get a new cat that can handle the extra unburnt fuel.


I am just giving my input on the subject due to the fact that I experienced the EXACT same thing with one of my 944s. This was what fixed the problem for me. I do understand that the tank may be cracked, drilled into (amp), or maybe the vent lines are cracked. Both of these are easy to check for when the car is not running. But I am telling you that when a car is running rich, you will experience a very strong smell inside the rear of the cabin.
Richgreenster is offline   Reply With Quote
Old 06-04-2010, 06:50 PM
Rennlist



Paid Advertisement
Reply

Tags
2004, 944, 968, 993, car, catalytic, cayenne, converter, fuel, gas, inside, porsche, replaced, service, smell, trunk, yukon

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -3. The time now is 03:23 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.6.1
Copyright ę 1998 - 2007 Rennlist.com

Advertise on Rennlist - Privacy Statement - Terms of Service - Jobs