fuel tank breather pipe

[vtrjames]

hey all. a question about the breather pipe.

my question is the thin breather pipe next to the overflow pipe on the rear of the 97-01 tanks should have a non return valve in it to prevent fuel spills when the tank is reasonably full and bike is leant over.?

i checked both my storms and neither have a non return valve on but both trickle fuel out.

checked lings and it seems something should be there rather than just a hose

[Wicky]

Sounds like you're overfilling the tank and the overflow pipe is doing its job.

[vtrjames]

no im not filling it too much its the breather dripping fuel not the overflow.

[Tweety]

no im not filling it too much its the breather dripping fuel not the overflow.

Neither have a valve of any sort on it... The breather is positioned such that if you overfill the bike, which BTW filling it to the brim, while sitting upright qualifies as, it will leak small amounts, especially now, when sunlight makes things warm up, and the petrol expand...

[vtrjames]

the breather pipe is a seperate pipe to the overflow pipe. it wont drip fuel if the fuel cap is closed as the overflow hole is sealed from the tank. the breather is the smaller tube next to it on the bottom of the tank. thats the one i get fuel from when bike is leant over to the right.

if you take the hose off the tank and tilt the bike petrol will run from that connection.
i have 2 vtrs and both do the same so i highly doubt i have the same fault with both tanks,

[VTRDark]

Neither have a valve of any sort on it...

That will be my fault. I did mention in a recent post that the breather has a valve in the line. I have double checked and it is in fact just an enlarger/reducer depending on how one looks at it. Not really sure why it's there unless it's for increased flow Anyway apologies people for the misleading info.



As for the leak it's generally down to overfilling but this usually causes a vacuum lock.
http://www.vtr1000.org/phpBB3/viewtopic.php?f=7&t=17803

Other explanations could be a faulty fuel cap or maybe a hole in the metal pipe inside the tank causing fuel to get in.

(:-})

[vtrjames]

ah ha thats the doofer thing i was looking for, thats just a enlarger thing.? wow its £12 for that thing.

at that money i thought it was a valve of some kind.

cheers for the pic

[VTRDark]

wow its £12 for that thing.

That will be why Honda put it on then. The only other reasonable explanation I can think of is that they used a smaller pipe to increase flow. Unless they wanted to have one smaller than the other to differentiate between the breather and overflow.

(:-})

[tony.mon]

I think that it's to stop people mistaking the small diameter section pipe (if it hadn't had the enlarger and bigger pipe fitted) with the vac line.

[Tweety]

the breather pipe is a seperate pipe to the overflow pipe. it wont drip fuel if the fuel cap is closed as the overflow hole is sealed from the tank. the breather is the smaller tube next to it on the bottom of the tank. thats the one i get fuel from when bike is leant over to the right.

if you take the hose off the tank and tilt the bike petrol will run from that connection.
i have 2 vtrs and both do the same so i highly doubt i have the same fault with both tanks,

Check the gasket on the filler cap, if it's deteriorated, it lets air in when it shouldn't which makes fuel flow at inopportune moments...