Gasket thickness

[JJHStang]

The gasket on my 1971 Mach1 pop open gas cap is cracked and flattened. Believe it is the original
Looking for a replacement but don’t seem to find any. I think I found one for around $2 but want $15 shipping.
I have decided to buy a piece of Nitrite rubber and try and make my own.

What is the thickness I should buy? Can’t measure the gasket on the cap and if I try to take off it will break up.

 

[Stanglover]

The gasket on my 1971 Mach1 pop open gas cap is cracked and flattened. Believe it is the original
Looking for a replacement but don’t seem to find any. I think I found one for around $2 but want $15 shipping.
I have decided to buy a piece of Nitrite rubber and try and make my own.

What is the thickness I should buy? Can’t measure the gasket on the cap and if I try to take off it will break up.

I used approx 1/16" or slightly thicker. It was from a piece of fish pond rubber, but tested ok soaked in gas for several days. It's been on for about 8 years now and no problems.
It is a bugger to fit though as the "washer" that holds it can't be removed, so you have to squeeze it under. Its' a pita but doable.
EDIT: pic added and thickness measured at .080" thick.

 

[JJHStang]

I used approx 1/16" or slightly thicker. It was from a piece of fish pond rubber, but tested ok soaked in gas for several days. It's been on for about 8 years now and no problems.
It is a bugger to fit though as the "washer" that holds it can't be removed, so you have to squeeze it under. Its' a pita but doable.

Thank you I will do some checking around. Usually see 1/8” smallest in rubber and cork.

 

[JJHStang]

Thank you I will do some checking around. Usually see 1/8” smallest in rubber and cork.

After looking at cost of material the one at NPD for $17 including shipping and tax. $4 to $5 more may not be so bad. Won’t have to try and cut my own

 

[Stanglover]

After looking at cost of material the one at NPD for $17 including shipping and tax. $4 to $5 more may not be so bad. Won’t have to try and cut my own

I'm not 100% sure, but I think the gasket NPD sell is made for the twist on cap, but worth checking.

 

[JJHStang]

I'm not 100% sure, but I think the gasket NPD sell is made for the twist on cap, but worth checking.

Thank you I will for sure check.

 

[Stanglover]

Thank you I will for sure check.

Check McMaster & Carr's catalog online. They may have something suitable but it must be gasoline resistant of course.

 

[JJHStang]

I used approx 1/16" or slightly thicker. It was from a piece of fish pond rubber, but tested ok soaked in gas for several days. It's been on for about 8 years now and no problems.
It is a bugger to fit though as the "washer" that holds it can't be removed, so you have to squeeze it under. Its' a pita but doable.
EDIT: pic added and thickness measured at .080" thick.

Thank you

 

[JJHStang]

I'm not 100% sure, but I think the gasket NPD sell is made for the twist on cap, but worth checking.

I am checking with them.