Locking gas cap

[intervale]

Has anyone had an issue with the locking gas cap not coming off, any suggestions?

Thank You

[Jordan]

You don't say if it is an old or new cap.  If new or relatively new the cork will still be fresh and when screwed on can be very tight and may stick.  Of course the cap also has to be unlocked .

[intervale]

Jordan thanks, it is new and I did unlock it.

[zoegrlh]

The cork seal can make the cap tight to take off and put on.  Mine is that way and what I did is lube the cork with grease.  Works really well to make the cap easier to put on and take off.
Bob

[mdsalemi]

A few years ago, I replaced the cork seal with a new rubber seal, and the cap is very hard to get on and off.  I keep saying to myself, "I need to put a little grease on the gasket" but somehow I never do...but I suspect it will make it much easier to deal with.

The rubber gasket was an aftermarket one from WorldPac.

[badali]

The tab part is spring loaded also and a drop of oil on this occasionally helps.

[114015]

A few years ago, I replaced the cork seal with a new rubber seal, and the cap is very hard to get on and off.  I keep saying to myself, "I need to put a little grease on the gasket" but somehow I never do...but I suspect it will make it much easier to deal with.

The rubber gasket was an aftermarket one from WorldPac.

Deers Dears,

Throw that ole cork seal away (or store it in your display cabinet, or use it for AACA or MBCA show purposes only),
go & get a new rubber seal, part no. A140 471 00 79 for the cost of about $$ 2.50
and put a little MoS₂ grease on the top of the fuel filler neck and the visible side of the seal
& enjoy!  

However, with the time gas (petrol) "dilutes" grease (i.e. "washes" it off); therefore, re-lube the seal once per year again.
You'll never ever have problems again.

IMHO...

Achim

[rb6667]

Thanks for info on the part # Achim.  I went to my local Mercedes dealer a few weeks ago and ordered 2 of those gaskets.  Put the new rubber seal on the cap, put a light coating of grease on the gasket and the filler neck.......and it still would not go on.  Push and twist as hard as I could, and it would not turn enough to hit the stops.

SO.....I took some 360 wet/dry sandpaper, and sanded the gasket until it would work.  I estimate a 20-30% reduction in the thickness of this gasket did the trick.

I used window cleaner (Windex) as a lubricant, and worked the gasket against the sandpaper in a figure 8 pattern until it was thin enough.

Sure did not want to lose that expensive chrome gas cap like some of our members have.

RB6667