• 4 Stroke Husqvarna Motorcycles Made In Italy - About 1989 to 2014
     TE = 4st Enduro & TC = 4st Cross

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    As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.

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Gas Tank Vent Tube Option?

2wheeler

2wheeler

Husqvarna
AA Class
I've got the 14 TE 310 factory valve with the hose extending under the engine. The hose slipped off at the gas cap. So I attached the same clamp that is on either side of the valve at this connection.

How does this valve work? Let air out but not in?

Should the clamp not hold, would the aftermarket version work? Do these valves perform the same function as the factory unit?


vent.jpg
 
You must have something different over there to us in Europe.
Mine came with just a hose that went from the fuel cap and ended in the steering head tube - no valve fitted.

I have since removed the hose and replaced it with a shorter piece about 2 inches long, with a valve to stop fuel coming out when I lay the bike down.
The valve admits air so that the fuel is able to get into the engine!

Mike
 
2wheeler said:
I've got the 14 TE 310 factory valve with the hose extending under the engine. The hose slipped off at the gas cap. So I attached the same clamp that is on either side of the valve at this connection.

How does this valve work? Let air out but not in?

Should the clamp not hold, would the aftermarket version work? Do these valves perform the same function as the factory unit?


View attachment 42871
Click to expand...

Pull off rubber hose, replace with this, one way valve as per your pic.
I have the 14 te250r.
 

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AlwynMike said:
You must have something different over there to us in Europe.
Mine came with just a hose that went from the fuel cap and ended in the steering head tube - no valve fitted.

I have since removed the hose and replaced it with a shorter piece about 2 inches long, with a valve to stop fuel coming out when I lay the bike down.
The valve admits air so that the fuel is able to get into the engine!

Mike
Click to expand...
Yeah it's the same.
 
Those things have a ball valve that when the bike is upright lets air flow BOTH ways. When bike upside down the ball closes and stops gas from flowing out.

PROBLEM: If your gas gets hot, the increase pressure in the tank pushes the ball up closing the valve and really increases the pressure in the tank!

I have boiled my fuel a couple of times. I had fuel spraying out from fuel pump gasket. Gas fumes rushed out of the fill opening even with the cap off. Increased pressure flooded the engine so would not run. I don't like to be sitting on a AIR/FUEL BOMB. I threw mine away and run fuel hose tubing out the bottom of bike away from the exhaust. Open with NO valve.
 
Yep, as shilo said, those things are more for motocrossers.. proper enduro bike just has a tube..

Those things can cause vapor lock in our bikes in the woods...
 
What a fine rendition of the Husky logo on rabskyline's avatar lol.

Thanks for the replies.

The factory tank tube with valve ran to the top of the canister.
A tube from the top of the canister to the EFI.
There was a dump tube at the bottom of the canister.

Before riding yesterday, I looped a zipty under the front tank mount gently sinching the tube against the side of the tank mount. The tube was in a vertical position at the valve with no pinch as it turned downward. It popped off again at the tank. It was hot out with high humidity and dew point. Nasty!

It is interesting the motocross style has worked fine in some locals and not well in other places.

With the tube running down under the engine and the valve removed. Fuel will not leak out when the bike is laid down?
 
I was having problems with the factory vent tube, it wasn't venting and causing a pressure build up ( or maybe vacuum?). The low fuel light would come on until I pulled off the tube at the cap. When the motor was off but hot I could hear the green valve releasing pressure like a steam train!
I bought a pack of the stubby vent valves off eBay thinking if they don't last very long I've got spares, six for less than $10 I think? Well I'm still on the first one a year later with no issues
 
2wheeler said:
I've got the 14 TE 310 factory valve with the hose extending under the engine. The hose slipped off at the gas cap. So I attached the same clamp that is on either side of the valve at this connection.

How does this valve work? Let air out but not in?

Should the clamp not hold, would the aftermarket version work? Do these valves perform the same function as the factory unit?


View attachment 42871
Click to expand...

I have one...run tight single track days..no problems...yet...however...I have noticed the gasket underneath my cap has begun to deteriorate...perhaps due to this high heat you guys are speaking of...hmmm. Am going to be replacing my gascap and keep the stubby as I don't seem to have any issues with gas pressure build up (ie opening cap when on reserve and not significant pressure issue). While on topic...do Husky caps have a specific thread pattern or will any aftermarket cap generally work?
 
Never had a drama, ride in anything from just above zero to a out 40deg Celsius with 95% humidity! never had a drama(well relating to these things) ..
 
One of our sponsors zipty or motorsportz has gas caps for the 511 I believe. Maybe other models as well.

umm yeah 40deg Celsius with 95% humidity THAT is pretty toasty! Yikes!

It is an adventure learning these bikes as I was out of the game since the 70's. :eek:
 
:naughty: Take that hose off and just run the hose ,your choice someplace away from the exhaust towards the ground or through the steering stem to vent to the front fender. Some will say that it washes the grease out of the lower steering stem bearing,:excuseme: I've never had this problem but I guess if you drop your bike a lot this could happen. I've had the above issues with both carbureted bikes and FI bikes. And to go one better I've had to remove the ball check valve that was installed in some of the KTM stock caps for the same reason. Tank gets hot from engine heat or sunlight, bike gets dropped and:thumbsdown: of course the ball valve in the cap closes so no gas spills . Wala here we go valve DOESN'T release because tank is hot and will preasurized when the bike is dropped and stock cap with check valve closes ,so no gas spills, then the tank becomes expanded. Bike starts running richer and tank starts growing,:eek: very disconcerting and scary when you realize you are ridding a pressurized bomb between your legs. Just my 2 cents
 
Waserman, that's exactly what I saw and worse. Tank blown up like a puffer fish and fuel spewing out all over the engine.

The little ball valve was NOT defective. That's the nature of the ball valve.
 
Got some fuel line but no stubby. May as well do the fuel line with no factory valve.

Since the factory valve only lets air in then yeah its gotta go! I am sure that is by design when used with the complete system (canister, EFI connection) Its one way function is most likely why it came off again in the woods.

If my count is correct we have 3 no valve/hose setups and 4 stubby/valve setups.
 
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