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  #1  
Old 10-27-2005, 08:20 PM
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Join Date: May 1999
Location: Somers, CT
Posts: 73
Condensation on Fuel Tank Cap

I have a 1993 300SD (w140) with 255,000 miles on it.

I could not get the fuel cap off the tank the other day
due to rust on the inside of the fuel cap. I replaced the
cap but later saw condensation on the inside of the new
cap. The fuel tank was 1/4 full at the time.

Does anyone have any ideas on what may be causing this?
I have had the car for a number of years and never had this
problem come up.

Thanks.

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Ralph Burnette
1993 300SD (286k + miles)
2000 SL500
2001 ML320
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  #2  
Old 10-28-2005, 12:00 PM
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Location: RI shore
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Ralph, I saw condensation on my fuel cap yesterday for the first time in over 9 years. When I saw your post and location (also CT) I thought "aha!", because I was also concerned when I saw this yesterday. Combine all the rain we've had lately with recent overnight temps around freezing - I bet what we're seeing is somewhat climatalogical, and maybe also not the greatest fuel at the pump.
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  #3  
Old 10-28-2005, 12:12 PM
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There is a vent for the fuel tank which exits under the car I believe in the right rear which may be clogged. Another way to tell is when you release the cap there is a swoooshing sound of air being sucked in. Run something like a piece of heavy wire up the tube to open it up.
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Old 10-28-2005, 12:36 PM
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I was always told (by someone) "always keep your tank full in the winter to prevent condensation". So maybe it is just the weather and that your tank is low.

Mike
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1988 F150 144,000 miles (leaks all the colors of the rainbow)
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  #5  
Old 10-28-2005, 07:01 PM
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Join Date: May 1999
Location: Somers, CT
Posts: 73
There is no swooshing sound when I open the fuel tank
but I am getting the DVD for the w140 in a few days and
will definitely look it up.

Thanks!!!
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1993 300SD (286k + miles)
2000 SL500
2001 ML320
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  #6  
Old 10-28-2005, 07:09 PM
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Join Date: Sep 2002
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Quote:
Originally Posted by Ralph Burnette
There is no swooshing sound when I open the fuel tank
but I am getting the DVD for the w140 in a few days and
will definitely look it up.

Thanks!!!
which dvd would that be?

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