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Old 02-21-2010, 01:10 PM
Registered User
Join Date: Feb 2010
Posts: 1
Gas Leak

I have an '89 560SL and when I start the car after it has been sitting for the winter, I have a major gas leak from the gas pump area. After the car has been runs for a while, the gas leak is less and less - eventually, the gas leak stops and all is dry for the spring, summer and fall. Car has 44,000 miles on it.Thoughts or ideas?

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Old 02-21-2010, 01:35 PM
Registered User
Join Date: Oct 2007
Location: Greater Metropolitan Beaverdam VA
Posts: 2,876
Fuel leaks

in that area are usually a product of the copper seals (washers) losing integrity. That was the only issue on mine when I awoke it from the dead.

They are inexpensive from the dealer. You will need 10 or 12 if you replace them all. They are also available from this site and some auto supply stores. Make sure you get the correct metric sizes for a leak-free fit. Once crushed they cannot be re-used.
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Old 02-22-2010, 10:18 AM
Registered User
Join Date: Jul 2003
Location: Ocean Isle Beach, NC
Posts: 2,463
If you're really ambitious, just remove the whole unit and replace all the seals, the filter and all the 20 year old rubber hoses. Then you're good for another 20 years.

'59 220S Cabriolet-SOLD and living happily in Malta
'83 240D 351,500 miles original owner-SOLD
'88 560SL 41,000 miles - being parted out
'99 E300 turbo 220,500 miles
'03 SLK320 40,000 miles - gave to my daughter
'14 Smart electric coupe 20,000 miles
'14 Smart electric cabriolet 18,000 miles
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Old 02-22-2010, 07:33 PM
82 380SL & 96 SL500
Join Date: Jun 2008
Location: Southern Illinois
Posts: 245
I agree with Len.

Probably less than $100 parts including a new fuel filter. No more work to fix it properly than to patch it.

That said, I really can't imagine the cause of a major gas leak which disappears like that.
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Old 02-23-2010, 10:23 AM
Tom McMenamin's Avatar
Registered User
Join Date: Aug 2001
Location: Orange Park Florida
Posts: 365
Gas Odor

The manual says replace the gas cap every so often. I had your problem replaced the cap and Walla! Fixed!

Buy it at the Dealer not aftermarket!

1988 560SL
Black Pearl/Palamino

Last edited by Tom McMenamin; 02-23-2010 at 10:24 AM. Reason: Further info
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