fuel tank vent?

[bus72]

does anyone know how a bay tank vents? by vent i mean where is air drawn in to prevent a vacume. is there supposed
to be a hole in the fuel cap or does the tank breath through the evap tubes that run from the tank and then return to the air
filter box. any clues???

 

[sparkywig]

Top pic 1967-69
Middle pic 1970>
Bottom pic pick-up

 

[bus72]

Top pic 1967-69
Middle pic 1970>
Bottom pic pick-up

nice piccy
as you can see from the top pic the tank breath's from the top and is piped into the filler neck so one would assume that
you would have a hole in the filler cap but i cant see one?

 

[r73]

mines like the top pic and it does stink of fuel! it made me check all the connections behind the firewall - and theryre good

 

[bus72]

so does anyone have an answer for my original question :?: :?: :?: :?: :?:

 

[r73]

so does anyone have an answer for my original question :?: :?: :?: :?: :?:

Hasn't sparky wig answered your question??
Pictures worth a thousand words!
The fuel vapours need to vent as they expand

 

[bus72]

so does anyone have an answer for my original question :?: :?: :?: :?: :?:

Hasn't sparky wig answered your question??
Pictures worth a thousand words!
The fuel vapours need to vent as they expand

i understand the purpose of the evap tubes these tubes merge into one tube and are then plumbed into the
airbox, so is air drawn into the tank from the airbox via these tubes?