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#1
06-11-2009, 01:50 PM
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Pressure 'Whoosh' when removing gas cap.
I am not having any problems with my 89'560SL except I am questioning why I do not get a pressure 'whoosh' sound when taking off the gas cap? is this normal for this model? ...........I also have an 88' 190E which 'whooshes' like crazy. Your comments please.
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#3
06-11-2009, 02:15 PM
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Quote:
Thank you.
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Share your knowledge. It's a way to achieve immortality. Dalai Lama.
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#4
06-11-2009, 02:45 PM
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not sure if this is against the rules of this forum
but here is a thread about this issue, http://www.benzworld.org/forums/r-c107-sl-slc-class/1376110-pressure-gas-tank.html hope this helps you, it looks like its normal because of the nonvented gas caps
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#5
06-11-2009, 03:00 PM
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If I'm reading all of this correctly, I "should" have pressure when removing the fuel cap? Mine does not. I have been "suspecting" that I still have a very small vacuum leak. Could it possibly be "at" the cannister.
Thanks!
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82 380SL 41K miles sold, 98 SL500 44K miles, 13 C300 4Matic, 14 CLA-250 4Matic
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#6
06-11-2009, 03:04 PM
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Pressure at the cap is normal.
__________________
 1987 560SL85,000 miles Meet on the level, leave on the square. Great words to live by Were we directed from Washington when to sow and when to reap, we should soon want bread. - Thomas Jefferson: Autobiography, 1821.
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#7
06-11-2009, 03:08 PM
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All mine give the same experience. Slightly less on the W220 but the diesels big time.
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BENZ THERE DONE THAThttp://www.peachparts.com/shopforum/...c/progress.gif 15 VW Passat TDI 00 E420 98 E300 DT 97 E420 Donor Car - NEED PARTS? PM ME! 97 S500 97 E300D 86 Holden Jackaroo Turbo D 86 300SDL (o\|/o)
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#8
06-12-2009, 09:44 AM
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the venting system on the SL's prevents the major swish noise. The SL gas tank being midship needs a more elaborate venting system as to not flood the passengers with gas fumes
__________________
Ron 2015 Porsche Cayman - Elizabeth 2011 Porsche Cayman - Bond,James Bond Sadly MERCEDESLESS - ALways LOOKING ! 99 E320 THE Queen Mary - SOLD 62 220b - Dolly - Finally my Finny! Sadly SOLD 72 450SL, Pearl-SOLD  16 F350 6.7 Diesel -THOR 19 BMW X5 - Heaven on Wheels 14 38HP John Deere 3038E Tractor -Mean Green 84 300SD, Benjamin -SOLD 71 220 - W115-Libby ( my first love) -SOLD 73 280 - W114 "Organspende" Rest in Peace 81 380 SL - Rest in Peace
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#9
06-12-2009, 02:03 PM
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Quote:
__________________
Share your knowledge. It's a way to achieve immortality. Dalai Lama.
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#10
06-12-2009, 03:28 PM
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the venting on mine is a series of rubber hoses at the top half of the tank which eventually run under the car to an exhaust port just forward the left rear axle. When I smelled fumes in mine I tracked it to a clamp on one of the hoses had let loose and my vent on the underside was clogged with dirt. I think this system was upgraded a bit from the sytem on my 72, but basically was the same
__________________
Ron 2015 Porsche Cayman - Elizabeth 2011 Porsche Cayman - Bond,James Bond Sadly MERCEDESLESS - ALways LOOKING ! 99 E320 THE Queen Mary - SOLD 62 220b - Dolly - Finally my Finny! Sadly SOLD 72 450SL, Pearl-SOLD 16 F350 6.7 Diesel -THOR 19 BMW X5 - Heaven on Wheels 14 38HP John Deere 3038E Tractor -Mean Green 84 300SD, Benjamin -SOLD 71 220 - W115-Libby ( my first love) -SOLD 73 280 - W114 "Organspende" Rest in Peace 81 380 SL - Rest in Peace
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#11
06-14-2009, 07:07 AM
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Mine wooshes too.....
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"It's normal for these things to empty your wallet and break your heart in the process." 2012 SLK 350 1987 420 SEL
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#12
06-14-2009, 07:30 AM
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It "Whooshes?" It's not one of those after market, Nike caps is it?
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" We have nothing to fear but the main stream media itself . . . ."- Adapted from Franklin D Roosevelt for the 21st century  OBK #55 1998 Lincoln Continental - Sold Max 1984 300TD 285,000 miles - Sold The Dee8gonator 1987 560SEC 196,000 miles - Sold Orgasmatron - 2006 CLS500 90,000 miles 2002 C320 Wagon 122,000 miles 2016 AMG GTS 12,000 miles
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#13
06-14-2009, 07:31 AM
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Mine does that, too. I assumed that the fuel system is designed to be pressurized like that.
__________________
" We have nothing to fear but the main stream media itself . . . ."- Adapted from Franklin D Roosevelt for the 21st century OBK #55 1998 Lincoln Continental - Sold Max 1984 300TD 285,000 miles - Sold The Dee8gonator 1987 560SEC 196,000 miles - Sold Orgasmatron - 2006 CLS500 90,000 miles 2002 C320 Wagon 122,000 miles 2016 AMG GTS 12,000 miles
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#14
06-14-2009, 09:10 PM
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Pressure 'Whoosh' when removing gas cap.
The whoosh indicates that your fuel evaporation control system is working just fine. In fact it will not pass smog in California if it doesn't whoosh, as I just recently learned.
As I understand it, Mercedes has a valve in the fuel charcoal canaster line that increases the pressure in the the fuel tank to reduce evaporation of fuel. I had to have all the rubber hoses in my fuel system replaced because one of them leaked.
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#15
06-14-2009, 11:14 PM
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My quote from the thread at the above link........
"Yes, normal. When it reaches a certain pressure a check valve opens bleeding off the excess into a line that ends up at the charcoal cannister. On non cannister cars, it just dumps overboard." Check your check valve or relate hoses.
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