66' 427/390 locking gas cap gasket

[Jay Bunt]

Is the gasket/seal on the locking gas cap supposed to be the cork style or rubber? Any help is appreciated.

Jay

[Geoff C.]

Any cork would last about 1 complete turn *NM*

[Jay Bunt]

Re: Any cork would last about 1 complete turn

Geoffrey,

Locking gas cap. No turns/twisting etc. Are you familiar with a locking gas cap?

[Bill Lucia]

Re: 66' 427/390 locking gas cap gasket

Jay: by coincidence my 66/427/390hp car came from the original owner with a locking gas cap. What is left of the gasket "APPEARS" to be either cork or brown paper. As you may know the locking gas cap was a dealer installed option and not a factory part. The original cap came with a brown paper gasket. I have both the original cap and the locking unit. The original cap with the paper gasket does not seal worth beans so I have two. One to drive with a rubber gasket and one to show with the paper. You might want to continue your search for gasket material because mine has only remnants left and its hard to tell but if I had to say I'd go with paper (could be glue remnants as well).

Regards

Bill #8620

[Geoff C.]

Locking gas cap gasket

Regarding cork: it provides a suitable liquid barrier when force is applied in the compression mode, however when force is applied torsionallly it tends to crumble badly.

I seem to recall that it is still necessary to twist the locking gas caps to seat it properly. However, I cannot readily check my old cars. They are in a separate garage 100 foot from my house, and still somewhat snow bound. Call me lazy, but I have not ventured there for 2 months and when my 500-foot long driveway is plowed, they pile up the snow leading directly to those garages.

[Bill Lucia]

How it works

The locking gas cap that I have pushes onto the filler neck. The lock tabs (spring loaded) spread as the cap is pushed and snap under the rim of the filler neck. To release the cap the key is inserted and turned. This opens the lock tabs allowing the cap to be lifted off of the filler neck. The action of turning the key may inadvertently turn the cap but it is not necessary to do so to remove it. The open sections of the filler neck have a tab that keeps the lock tabs from slipping into the opening. On the standard cap you must depress the cap to get the tabs on the cap to clear the tabs on the filler neck. As you push down and turn the cap the cap tabs clear the filler neck tabs and it pulls itself down and seals the cap gasket against the filler neck. To remove you reverse the process, (i.e. push down and turn to get the tabs - both sets to clear each other). The locking cap uses the key to get the tabs to extricate themselves from the lip of the filler neck, thus, you don't need to turn the cap per se.

regards

Bill #8620

[Jay Bunt]

Re: 66' 427/390 locking gas cap gasket

Bill/Geoffrey,

Thank you for you time and info. Geoffrey, you made me laugh. Let me know what you find out when you get through all of that snow!

Regards, Jay

[Warren S.]

Re: How it works

For what it is worth, I agree with Bill 100%. My dealer installed locking gas cap does not require any turning. My cap and key work exactly as Bill has described.

[Geoff C.]

[Jay Bunt]

Re: Snow

Yes, I do.......Thanks again for the laughs...

[Bill Lucia]

Sense of humor intact...smiling NM *NM*