Vented fuel cap

[Ranger]

Use this when removing your fuel cap results in a big sucking noise. Replace every couple years because, having just bought my 3rd, they seem to quit venting after a while. 1989 BMW 325I 2.5L L6 Fuel Tank Cap | RockAuto

[zurbo]

If you really need it in a hurry, FedEx overnight is only $101.99.

[HiFiGuy]

Or here’s one you can have by the weekend for about $6.