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#2935435 - 03/11/13 03:19 PM grease gas cap seal?
Digital2k2 Offline


Registered: 01/12/04
Posts: 373
Loc: va
My gas cap isn't sealing completely. I had a locking one on there and took it off because I figured the seal went bad on it. Put the original back on and I can still smell fumes a bit. I tried cleaning the filler neck where the seal contacts and the seal of the cap but it didn't take care of it.
This cap was only used for around 3k miles and is just a few years old with what looks like a silicone seal on it (orange) instead of the regular black seal that the locking one has.

My next thought is to try putting a thin layer of dielectric grease on the silicone seal. Is this a bad idea? The only downside I can think of is that it may catch more dirt and need to be cleaned more frequently. Worth a shot?

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#2935438 - 03/11/13 03:23 PM Re: grease gas cap seal? [Re: Digital2k2]
hemitom Offline


Registered: 03/12/07
Posts: 749
Loc: canada
If its already not sealing i think you have nothing to lose, it may soften the gasket enough to work again.
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#2935458 - 03/11/13 03:40 PM Re: grease gas cap seal? [Re: Digital2k2]
AandPDan Offline


Registered: 02/01/11
Posts: 787
Loc: MA
Are you sure it is the cap leaking?

Sometimes the filler necks rust out.

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#2935463 - 03/11/13 03:41 PM Re: grease gas cap seal? [Re: Digital2k2]
JHZR2 Offline



Registered: 12/14/02
Posts: 35758
Loc: New Jersey
MB sells gaskets for their caps. After 30 years sometimes it is needed.

Perhaps the size is the same on all filler necks?

Cut your own gasket from sheet rubber?

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#2935469 - 03/11/13 03:47 PM Re: grease gas cap seal? [Re: Digital2k2]
Jarlaxle Offline


Registered: 02/02/12
Posts: 5109
Loc: New England
Make sure whatever you use is gas-proof!
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#2935474 - 03/11/13 03:49 PM Re: grease gas cap seal? [Re: Digital2k2]
mechanicx Offline


Registered: 10/23/09
Posts: 8576
Loc: Ohio
I would just replace the cap or the seal. Silicone based seals are the one seal type you shouldn't use silicone grease on, unless maybe you are trying to soften the seal.

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#2935567 - 03/11/13 05:19 PM Re: grease gas cap seal? [Re: Digital2k2]
Tegger Offline


Registered: 03/20/06
Posts: 1685
Loc: Canada
Originally Posted By: Digital2k2
My gas cap isn't sealing completely. I had a locking one on there and took it off because I figured the seal went bad on it. Put the original back on and I can still smell fumes a bit.

What year, make, model?
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#2939244 - 03/15/13 01:13 AM Re: grease gas cap seal? [Re: Digital2k2]
Digital2k2 Offline


Registered: 01/12/04
Posts: 373
Loc: va
Just seems like if it was a bad seal that the barely used original cap wouldn't do it too. I tried a thin coat of dielectric grease on the seal and it didn't make a difference.

The vehicle is an 09 nissan frontier.

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