Author Topic: Fuel cap gasket (Read 8139 times)

mauro12 · « **on:** May 31, 2021, 20:21:07 »

Hello guys , I have to replace the fuel cap gasket because mine is totally cracked . I have read that some people prefer rubber rather than cork but I only found corks type .
Also I would like to ask you what is the best way to install it . Put some gasket glue ? Thank you

Pawel66 · « **Reply #1 on:** May 31, 2021, 20:31:05 »

Mauro, I bought mine from Mercedes. Do not remember, but seems to me it was rubber...

It should just stay there, fits with some tension.

You may want to check if filler neck is nice and smooth. Also: may want to put some vaseline on the gasket to make it ride smooth on the filler neck, which may feel tight when you put in the new gasket.

mauro12 · « **Reply #2 on:** May 31, 2021, 20:39:37 »

Hi, I see that some website do sell the cork and rubber gasket . Which part goes where ?
I mean , when I remove the cap , which part should I see? Cork or rubber ?
No glue is needed to put the seal?

Pawel66 · « **Reply #3 on:** May 31, 2021, 20:44:37 »

There is just one gasket there. Could be earlier it was a piece of cork, now it is rubber. I guess it isa up to you or may want to investigate what 250sl had.

No, no glue, at least I did not use glue. Maybe on earlier filler cups.

Tyler S · « **Reply #4 on:** May 31, 2021, 21:10:40 »

The cork gaskets seem to last longer as the rubber gaskets aren’t ethanol resistant. Cork would also be period correct on a 250sl.

mauro12 · « **Reply #5 on:** May 31, 2021, 21:38:29 »

Thank you guys . The cork side should be seen when you remove the cap , right ? I’m asking for the proper orientation. How can the gasket stay there in place with no glue ?

neelyrc · « **Reply #6 on:** May 31, 2021, 21:47:07 »

I ordered one and a spare a couple of years ago from MB for my 280 SL. I don't recall if I had a part number when I ordered or if ordered by word description with my VIN number. I received cork gaskets. Part number I received was 110-471-02-80.

Pawel66 · « **Reply #7 on:** May 31, 2021, 22:26:03 »

I also bought one for 280SL, i think I got rubber. I will check over the weekend, when i get to my car.

I remember the trouble with cork i had was that when it got dry, it started leaking...

Garry · « **Reply #8 on:** May 31, 2021, 23:02:47 »

The cork gasket will sit under the two lugs and does not fall off. It pays to put a small amount of lubricant on the side that goes against the fuel pipe from the tank to stop it drying out and sticking too much. Either a bit of white grease or silicone spray will work.

Garry

mauro12 · « **Reply #9 on:** May 31, 2021, 23:12:22 »

Thank you guys . I will try to buy from Mercedes and install .

Charles 230SL · « **Reply #10 on:** May 31, 2021, 23:46:15 »

Quote from: Garry on May 31, 2021, 23:02:47

..It pays to put a small amount of lubricant on the side that goes against the fuel pipe from the tank to stop it drying out and sticking too much. Either a bit of white grease or silicone spray will work...Garry

Yes, absolutely (and I thought I was the only one that had to do this). I rubbed a dab of grease on the gasket again just last week

Pawel66 · « **Reply #11 on:** June 01, 2021, 07:35:36 »

Quote from: mauro12 on May 31, 2021, 23:12:22

Thank you guys . I will try to buy from Mercedes and install .

If you intend to buy from Mercedes, part number is A 110 471 02 80 for 250SL (it is same for 280SL). neelyrc received cork for it, I do not remember what I received...

It replaced A 110 471 00 80.

Shvegel · « **Reply #12 on:** June 01, 2021, 09:10:11 »

I bought one many years ago that was rubber and my cap was nearly impossible to put on and take off. When I restored my car I bought a new one that was cork and now it fits like it should.

mauro12 · « **Reply #13 on:** June 01, 2021, 12:48:00 »

Thank you Paweł . So the part number is 110 471 0280.
This is the current part number right ? Do you know how much it cost ?
I’m still wondering how is possible that this gasket can stay there in place without any sealant . What is the best way to put it ?
Should i expect some change in the fuel pressure or behavior of the car overall ?

Iconic · « **Reply #14 on:** June 01, 2021, 14:35:45 »

Mauro,
Since you still are wondering about how the gasket stays in place, maybe you should show us a picture of your cap, the side that interfaces with the fuel inlet.
This is not an issue for the original style caps. Definitely no glue or sealant needed.
Good luck,
Mark

Pawel66 · « **Reply #15 on:** June 01, 2021, 15:36:32 »

Mauro, yes, it is the current part number. It costs ca EUR 5 without VAT, so you would have to add whatever VAT is there where you are.

In this thread (link below) you have the picture of the bottom of the gas cap. It is held by two lips, as you see and holds also as it fits tight by seal inner diameter.

https://www.sl113.org/forums/index.php?topic=31034.msg225240#msg225240

As for the performance of the car: it is a non vented cap. If you had one that was tight and your tank evaporation system was working, nothing should happen. If your cap so far was not tight but original and your evaporating system is clogged, there may be issues with fuel supply. If your cap was nor original and vented type cap, nothing will change.

mauro12 · « **Reply #16 on:** June 01, 2021, 17:42:54 »

Guys here I send you some pictures of my gas cap .
The gasket on mine was not sealing properly and the result was sometimes a big stain of petrol in the rear bumper . Maybe was condensation. I’ve never had problems with fuel smell inside the cabin or inside the trunk. Should I be concerned with the sealing of the cap ? This could change something in the fuel supply ? Thank you
My gas cap is the original one . Or maybe was replaced 30 years ago from the previous owner, who knows . Is the key type .

badali · « **Reply #17 on:** June 01, 2021, 17:54:43 »

The seal is completely missing so you could temporarily buy a plain gas cap at a parts store until you receive the new gasket.

Iconic · « **Reply #18 on:** June 01, 2021, 18:31:36 »

My opinion is that you should put the cork seal in with NO glue. It doesn't need any. If fits well in that depression/circular channel. The cork seal has a rubber type backing. I put that towards the cap so that the cork was touching the fuel inlet. A dab of grease on the fuel inlet or gasket makes it easier to put the cap on the car.
I had trouble with the rubber gasket, it made it very difficult to put the cap on all the way.
You will not know about any fuel supply or running issues until you try it. If it causes a running issue, there is something else wrong. Probably in the fuel ventilation system.
If you don't use the gasket, I would think it would be easy for the cap to fall off.

mauro12 · « **Reply #19 on:** June 01, 2021, 19:36:43 »

What could happen considering that the new seal will avoid the escaping of fuel vapor ? I’ve never had any idea that a seal could create this kind of issues .
Right now the car is driving fine with no issues and I don’t see any fuel in the rear bumper . Considering that my tank is only half full .

mauro12 · « **Reply #20 on:** June 01, 2021, 20:01:46 »

What is the risk to drive the car without gasket in the cap ?

Pawel66 · « **Reply #21 on:** June 01, 2021, 21:27:33 »

Splashing petrol around.

Garry · « **Reply #22 on:** June 01, 2021, 23:03:22 »

As Pawel said a full tank may splash petrol out but as it is loose it also runs the risk of falling off if it jiggles around. You could cut out an interim gasket from some other material, even a heavy cardboard, if it is only for a few weeks until a new seal arrives.

Garry

mauro12 · « **Reply #23 on:** June 02, 2021, 18:39:05 »

Losing the cap would be a disaster . I will buy a new seal ASAP .

114015 · « **Reply #24 on:** June 02, 2021, 23:21:28 »

Quote

Losing the cap would be a disaster . I will buy a new seal ASAP .

Mauro,
Fully agree here.....

... but NOT with what the other said.
The original cork gasket is just crap.

It deteriorates quickly and is prone to losing gas with the relevant spots on your rear bumper half.
Better use a fuel-resistant rubber gasket; there is one with a 140 470 something number (which I have to look up again).
Put a little bit of grease on (I always use MoS2 grease) on the gasket and on the filler neck twice a year - and it will work like a charm.
Never having spots on the bumper anymore, no smell and easy opening and locking.

Achim

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Author Topic: Fuel cap gasket (Read 8139 times)