What's the deal with this leaky fuel cap

[Dougeye]

I have an old Husqvarna 155BT backpack blower that has a Kawasaki engine, with a plastic fuel tank. The fuel cap was leaking, so I bought a new one. It came just as in the photos, without any sort of gasket in it, and it too leaks, from the little button thing in the middle. I assumed that was a one way valve that would allow air in but not allow fuel out, but the fuel comes out of it in a stream. What am I missing here?

 

[Peter 315]

Your missing a part.. Look here....https://www.partstree.com/parts/husqvarna-695000513/

 

[Dougeye]

No kidding I'm missing a part. Thank you, Peter.

 

[Peter 315]

Email this guy 9.00 free shipping...Blower Fuel Cap Fits 125BT 145BBT 155B 155BT 165BT H14B TA24 KAAZ 5313399 | eBay

 

[Dougeye]

Email this guy 9.00 free shipping...Blower Fuel Cap Fits 125BT 145BBT 155B 155BT 165BT H14B TA24 KAAZ 5313399 | eBay

Nope, I already have that one... without the breather. Best deal for the cap and breather, parts and shipping, that I found is on Amazon, so I ordered it. Thanks for your help.