Plastic fuel tank cap gasket with vent?

[ebinmaine 67,671]

I have a c-160 gas tank that has no gasket inside the cap.

 

As you can imagine considering there's a hole in the center of the cap that leaks quite a fair amount.

 

What can I make a vented gasket from and where do I put the vent hole in the gasket itself?

[Achto 27,609]

Most of those have a rubber or cork gasket ring, with nothing over the vent hole.

 

[8ntruck 7,021]

Probably make the gasket like a baffle - put vents in the gasket not in line with the vent in the cap.  Material?  Depends on the geometry of the cap.  If you can manage a round, flat gasket, maybe some sort of high durometer fuel resistant gasket material? 

 

I can't imagine why you are having apparent fuel sloshing issues, given the golf green like property that you operate on.....

Edited December 17, 2021 by 8ntruck

[ebinmaine 67,671]

5 minutes ago, Achto said:

Most of those have a rubber or cork gasket ring, with nothing over the vent hole.

 

 

 

3 minutes ago, 8ntruck said:

baffle

 

 

This is what I've got guys

 

 

 

[pfrederi 17,741]

These are from a red tank and a black plastic  tank on Chargers but should be very similar.  Two piece operation with internal tubes..  offset

 

[pfrederi 17,741]

You cap looks just like my plastic one on the left.

[ebinmaine 67,671]

2 minutes ago, pfrederi said:

You cap looks just like my plastic one on the left.

 

Agreed.

 

Maybe I could make up a double layered gasket with the middle hollow and then punch a couple holes in the other layer so they won't line up with the cap orifice. 

[8ntruck 7,021]

Gas cans used to come with 'seal discs', a block off plate to go under the pour spout.  Got one of those lying about?  Poke a couple of #50 size drill holes off center & sandwich it between the cap bad tank.

[ebinmaine 67,671]

12 minutes ago, 8ntruck said:

Gas cans used to come with 'seal discs', a block off plate to go under the pour spout.  Got one of those lying about?  Poke a couple of #50 size drill holes off center & sandwich it between the cap bad tank.

I like the idea quite a lot but I don't think I have anything like that hanging out

[wallfish 17,014]

3 hours ago, ebinmaine said:

I don't think I have anything like that hanging out

Scissors and an empty plastic oil jug?

Offset the hole and you can use a small piece of foam under the hole in the cap pinched in between.

[ebinmaine 67,671]

1 hour ago, wallfish said:

Scissors and an empty plastic oil jug?

Offset the hole and you can use a small piece of foam under the hole in the cap pinched in between.

Foam from BBT's favorite pillow ok?

[Handy Don 12,237]

3 minutes ago, ebinmaine said:

Foam from BBT's favorite pillow ok?

= wishing for extreme discomfort 

[pfrederi 17,741]

15 hours ago, wallfish said:

Scissors and an empty plastic oil jug?

Offset the hole and you can use a small piece of foam under the hole in the cap pinched in between.

  Most foam will not hold up to gasoline.  You need to experiment with pieces first...

[gwest_ca-(File Mod) 11,050]

A small amount of stainless steel pulled from a pot scrubber may work.

[wallfish 17,014]

3 hours ago, pfrederi said:

  Most foam will not hold up to gasoline.  You need to experiment with pieces first...

The foam from an air filter cover or the foam used for an air cleaner

It only needs to be a small piece. One of the caps I have is set up like that

[Lee1977 6,673]

I haven't had a gasket in mine for years as long as you keep it an inch or so down It  don't leak enough to hurt anything 

Cut a disk out of a plastic oil bottle and drill a small hole off center.

Edited December 19, 2021 by Lee1977