Is it worth changing fuel cap?
Thread Starter
Junior Member
Joined: Aug 2003
Posts: 51
Likes: 0
From: South Florida
MY12 W212 E350
Is it worth changing fuel cap?
Hello Folks,
Every time my check engine light comes on, I tighten the fuel cap and the light usually goes away within a day or so.
Will changing the fuel cap fix this? Has anyone replaced their stock fuel cap and gotten this to work?
BTW, this is for a '98 ML320.
Thanks,
alf
Every time my check engine light comes on, I tighten the fuel cap and the light usually goes away within a day or so.
Will changing the fuel cap fix this? Has anyone replaced their stock fuel cap and gotten this to work?
BTW, this is for a '98 ML320.
Thanks,
alf
MBWorld Fanatic!
Joined: Mar 2004
Posts: 1,175
Likes: 24
From: Boston, MA
'14 ML350, '13 C220 CDI, '07 C280, '98 ML320
It might just be that you are not tightening the cap
enough. I've learned that if we tighten until we hear
atleast 2 clicks, then I don't get the check engine light.
If I just tighten it barely (meaning no clicking sound),
then I am certain now that I will get the check engine light.
So, for the next few refuelings, try tightening the cap
until you hear several clicks. See if that fixes your problem.
If the problem persists, the gasket in the gas cap is probably
worn out.
Good Luck
enough. I've learned that if we tighten until we hear
atleast 2 clicks, then I don't get the check engine light.
If I just tighten it barely (meaning no clicking sound),
then I am certain now that I will get the check engine light.
So, for the next few refuelings, try tightening the cap
until you hear several clicks. See if that fixes your problem.
If the problem persists, the gasket in the gas cap is probably
worn out.
Good Luck
Thread Starter
Junior Member
Joined: Aug 2003
Posts: 51
Likes: 0
From: South Florida
MY12 W212 E350
Yeah, mine does the same thing. But I guess it must be a worn gasket.
Not sure how much they go for, but gonna replace it to fix this annoying problem.
Thanks,
alf
Not sure how much they go for, but gonna replace it to fix this annoying problem.
Thanks,
alf
Member
Joined: Mar 2004
Posts: 147
Likes: 0
From: Switzerland
ML 270 CDI 2002
Hi guys. I'm reading your post in disbelief. Are you saying that the sensors on the ML are even rigged to the fuel cap?? or is it because it is a pressurised system? I'm not taking the ****, but it seems incredible that the engine warning light would be affected by the fuel cap. Please let me know any info you have on this, thanks.
Nick
Nick
MBWorld Fanatic!
Joined: Apr 2003
Posts: 4,781
Likes: 3
From: Boston
'05 A4 1.8TQM6
yes, the fuel tank is pressurized. If the cap is not on tight enough, as in leaking vapors out, it will trigger the check engine light. Once you tighten it, it will go out in a little bit. All MB tanks have been presurized for a long time now as well as many other car manufacturers.
