Fuel breather question

[Greeny.]

So years ago when I removed my carbon canister I let the tank breather vent in the same location the carbon canister was originally located, however last trackday I noticed a very strong smell of fuel in the car giving me a banging headache by the end of the day. After an inspection of the breather pipe it’s broken and as such now venting nearer the bulkhead so for the time being at least I’ve blocked it off. I assume this isn’t the done thing as it seems to cause pressure/hissing when removing the cap.

Clearly I don’t know a great deal about fuel breather systems so any input is appreciated 👍

Cheers
Dan

 

[haimsey]

I've got (because I saw it on here) a fuel breather that was meant for motorbikes. One way breather, so only 'out'. Not fitted as I haven't pulled carbon canister yet.

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[RustyMojo]

Sorry to hijack slightly. But I have been toying with the idea of losing my carbon canister and it’s annoying tick. Is it just a case of removing it fitting some sort of resistor and one of these vents? If so any how to guide as to what resistor is needed and best place to fit the vent?

 

[Krarl]

Sorry to hijack slightly. But I have been toying with the idea of losing my carbon canister and it’s annoying tick. Is it just a case of removing it fitting some sort of resistor and one of these vents? If so any how to guide as to what resistor is needed and best place to fit the vent?

Leave the cap from the canister plugged in and the car won't notice any difference mate

 

[RustyMojo]

Will that still make a noise though?

 

[Krarl]

Can't say I've noticed it on mine tbh mate. Then again I've got a Ktec stealth with no resonator so as soon as I start the car any small noises like that are drowned out 😂

 

[David172]

Can't say I've noticed it on mine tbh mate. Then again I've got a Ktec stealth with no resonator so as soon as I start the car any small noises like that are drowned out 😂

This is the cure for most problems iirc

 

[haimsey]

Can't say I've noticed it on mine tbh mate. Then again I've got a Ktec stealth with no resonator so as soon as I start the car any small noises like that are drowned out 😂

Lol! I found it to be a solution also, added a decat and it even silenced the little voice in my head saying "it's too loud with a stripped interior"

 

[haimsey]

Leave the cap from the canister plugged in and the car won't notice any difference mate

Never thought of this, might do this when I pull mine off

 

[robzracing]

I've got (because I saw it on here) a fuel breather that was meant for motorbikes. One way breather, so only 'out'. Not fitted as I haven't pulled carbon canister yet.

ATV MOTOCROSS QUAD DIRT BIKE FUEL CAP PETROL TANK One Way BREATHER PIPE .. | eBay

Find many great new & used options and get the best deals for ATV MOTOCROSS QUAD DIRT BIKE FUEL CAP PETROL TANK One Way BREATHER PIPE .. at the best online prices at eBay! Free delivery for many products!

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This is what I have. Best fitted with the tank dropped though and not even sure it's doable without removing the tank.

 

[Greeny.]

Got a trackday next week, any issues with leaving it blocked for the time being?

 

[Robbie Corbett]

Got a trackday next week, any issues with leaving it blocked for the time being?

You'll be fine, just open the fuel cap for a moment between sessions or when in pit. Tank is plastic as long as you diligently let it vent it shouldn't turn inside out. Some people say the fuel cap has another vent in it but I haven't noticed one.

I also have a little one way valve which I haven't fitted yet however I think I will try to install it slightly remotely so I can occasionally check it and replace if needed. Likely to have dog s**t Chinaland orings inside which will degrade over time and remove the one way valviness.

 

[Greeny.]

I’ve purchased a few bits to try and make good of what’s left of the current tank breather at the front of the car as I won’t be getting the tank off before next week.

 

[scullyg40]

I've got (because I saw it on here) a fuel breather that was meant for motorbikes. One way breather, so only 'out'. Not fitted as I haven't pulled carbon canister yet.

ATV MOTOCROSS QUAD DIRT BIKE FUEL CAP PETROL TANK One Way BREATHER PIPE .. | eBay

Find many great new & used options and get the best deals for ATV MOTOCROSS QUAD DIRT BIKE FUEL CAP PETROL TANK One Way BREATHER PIPE .. at the best online prices at eBay! Free delivery for many products!

www.ebay.co.uk

Shouldn't it be only 'in'? Because when the fuel get's lesser, air should replace it?