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#1
10-27-2005, 07:20 PM
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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.
__________________
Ralph Burnette 1993 300SD (286k + miles) 2000 SL500 2001 ML320 
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#2
10-28-2005, 11:00 AM
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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.
__________________
'82 300SD - 361K mi - "Blue" "Good judgement comes from experience. Experience comes from bad judgement." listen, look, .........and duck.
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#3
10-28-2005, 11:12 AM
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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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#4
10-28-2005, 11:36 AM
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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
__________________
1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine) 1988 F150 144,000 miles (leaks all the colors of the rainbow) Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra
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#5
10-28-2005, 06:01 PM
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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!!!
__________________
Ralph Burnette 1993 300SD (286k + miles) 2000 SL500 2001 ML320
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