Sometimes when I come to a stop I hear a light popping noise coming from what I think is the fuel filler area. I suspect it has something to do with the tank venting or evap system. Anybody know what is causing it. The dealer is unable to reproduce it. Which is somewhat understandable as it doesn't happen all the time.

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MBlovr
'59 180 Dad's original
'59 180 Dad's 2nd one
'67 250SE Dad's last one
'59 220 SE My first one
'62 220SE Coupe second one
'89 190E 2.6 5spd third one
'06 E350 4matic (sold)
'10 E350 4matic

Is it possible its the locking mechanism for fuel filler door?

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

First time I had this complaint, it took me forever to figure out what it was.

It's the shutoff valve on the charcoal canister thats located in the right rear wheel well. Its normal.

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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350

First of all thank you so much for replying. I have been living with this since I bought the car last March. What does this part do exactly? Could I disable it temporarily to confirm that the noise goes away when I do?

Not sure what you mean when you say its normal, I've never driven a car that does that and frankly it doesn't meet with my expectations of how the car should sound idling at a stop light. I mean it's not that bad but the car is a late model Mercedes. Are you saying that even if it was replaced with a new one it would make the same sound? And is there not an improved part?
Maybe the sound of the shut off valve is normal but how often it is being triggered isn't. Do you know what triggers it? Could another sensor be bad?

Again thanks for the reply I was hoping an experienced tech would respond.

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MBlovr
'59 180 Dad's original
'59 180 Dad's 2nd one
'67 250SE Dad's last one
'59 220 SE My first one
'62 220SE Coupe second one
'89 190E 2.6 5spd third one
'06 E350 4matic (sold)
'10 E350 4matic

They finally replaced the canister and the noise is gone. Wasn't normal

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MBlovr
'59 180 Dad's original
'59 180 Dad's 2nd one
'67 250SE Dad's last one
'59 220 SE My first one
'62 220SE Coupe second one
'89 190E 2.6 5spd third one
'06 E350 4matic (sold)
'10 E350 4matic

One of the dead bodies you are hauling around is not so dead, and wants out.

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Cheers!
Scott McPhee

1987 300D

Haha....good one scott

Old one

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MBlovr
'59 180 Dad's original
'59 180 Dad's 2nd one
'67 250SE Dad's last one
'59 220 SE My first one
'62 220SE Coupe second one
'89 190E 2.6 5spd third one
'06 E350 4matic (sold)
'10 E350 4matic

OK, so you're aging dead bodies back there and suspect it could be the old one. Start with that guy.

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Cheers!
Scott McPhee

1987 300D