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#1
11-13-2003, 03:34 AM
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Gas Cap Leak!
does gas caps leak usually? gasket go bad ever? I filled up my car the other day, I didn't over fill. i stopped when it clicked as always. Today when I made short trip I smelled gas, looked inside the gas door and some gas. wiped it dry.. went driving around and again more gas. I thought it was just full but its now down 1/8 of a tank after driving 30 miles, and still leaking. HELP!
cars os 1996E320, 106000 miles. thanks! ... and no CEHECK ENGINE LIGHTS!
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1996 E320- 18" Chrome AMG, Bling Bling Mirrors 
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#3
11-13-2003, 10:10 AM
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The system is pressurized...if your cap leaks, then you will have problems with gas spewing out of the cap (especially on hot days)!
But I am concerned about the amount you are losing! A cap leak would lose trace amounts...perhaps you have a leak elsewhere. It doesn't take much fuel to create a lot of odor!
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2009 ML350 (106K) - Family vehicle 2001 CLK430 Cabriolet (80K) - Wife's car 2005 BMW 645CI (138K) - My daily driver 2016 Mustang (32K) - Daughter's car
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#4
11-13-2003, 12:42 PM
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MB offers "special" gas cap seal # 140-471-00-79 FOR $2.40
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#5
11-13-2003, 01:51 PM
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I had to buy and use an aftermarket, ugly looking cap when the car went through a Drive Clean test here and was told the cap failed the pressure test. I had that cap for a week and replaced it with a factory one.
Now i find wet spot under the cap sometimes before i removed the cap for fuel and it smells gas.  I am 100% sure it's not from the last refuel 'cos i never overflow it. Since it's a new cap, what else can i try to stop this? Thanks for the advise. ___________________ 92 300E 135,766 KM John
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