Best Fuel Cap/Seal (Fuel Smell...) Options

[GregAmy]

Broke out the '74 914 today and man does she run nice. New fuel, started right up, drives smooooth...

But I'm getting a fuel smell each time a take a hard-ish left turn. I pulled over and I can't see any liquid in the scupper area but I do see some stains below the scupper tube (could be from last fillup, there's no hose on it). No obvious leaks at the fuel level sensor or fuel neck, I replaced those gaskets some time ago when I replaced the tank for rust spots on the sides.

I have what appears to be an original metal fuel cap and I replaced the rubber o-ring some years ago (814Rubber). I did notice that when I removed the cap today that the face of the o-ring was wet. So I think a little bit of fuel is escaping past the o-ring on hard-ish left hand corners, certainly when the tank is at a higher fuel level (it was still doing it at 3/4).

What's the tips here? I'm thinking I might try gently bending the cap tabs so that it clamps harder, though it's pretty stiff to get on and off right now already. Who's got the best o-ring for the cap; anything thicker available?

Maybe it's just time to replace it again? Id' guess it's about 5-7 years old. It's easy enough to try.

I'm not too worried about it since I'm not seeing a massive liquid leak but the smell is annoying. This car is too nice to have to accept that.

Thanks! - GA