Fuel Filler - Breather

[rjbathgate]

Hi,

I have a query regarding my fuel tank filler / breather.

Picture one, you can see the breather hose come off the top of the fixed tank.

Picture two, you can see where the breather comes up into the small hole at the top of the filler pipe.

However my question is, whilst this allows the tank to breath when filling, what about when it's running? Picture 3 shows the filler cap, which is nicely sealed with an O-Ring...

From my tote tank days, I know I need to let these tanks breath when they are being used thus maintaining correct pressure as the totes empty.

Is the situation the same with a fixed tank? If so, how do I let it 'breath' when it's being used, as I can't leave the filler cap undone as that'd get pretty wet........

Cheers

[Channel Ribs]

Could there be a second, perhaps smaller, breather that vents elsewhere?

[Leapy]

Originally Posted by Channel Ribs

Could there be a second, perhaps smaller, breather that vents elsewhere?

There must be some vent mechanism or the damage would already have been done Just need to find it...

What does that top surface of the cap look like...there's a chain attached but is its chain attachment 'vented' or blind?

[rjbathgate]

Originally Posted by Leapy

There must be some vent mechanism or the damage would already have been done Just need to find it...

What does that top surface of the cap look like...there's a chain attached but is its chain attachment 'vented' or blind?

Found two tiny holes in the cap which lets it breath.

Panic over.

[kubcat]

The vent hole is there to allow it to fill easier without splashing back. When filling the tank with fuel the air in the tank has to go somewhere, this breather allows the air in the tank up a path into the atmosphere.

Glad you found the cap holes, as Leapy said, you would have known about it much earlier if they didn't exist.