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

  • Hi everyone,

    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.

    When he passed, I worked with his kids to gather the necessary credentials to keep this site running. Since then (and for however long they worked with Coffee), Woodschick and Dirtdame have been maintaining the site and covering the costs. Without their hard work and financial support, CafeHusky would have been lost.

    Over the past couple of weeks, I’ve been working to migrate the site to a free cloud compute instance so that Woodschick and Dirtdame no longer have to fund it. At the same time, I’ve updated the site to a current version of XenForo (the discussion software it runs on). The previous version was outdated and no longer supported.

    Unfortunately, the new software version doesn’t support importing the old site’s styles, so for now, you’ll see the XenForo default style. This may change over time.

    Coffee didn’t document the work he did on the site, so I’ve been digging through the old setup to understand how everything was running. There may still be things I’ve missed. One known issue is that email functionality is not yet working on the new site, but I hope to resolve this over time.

    Thanks for your patience and support!

Fuel Vent Problem

mlorenzini

mlorenzini

Husqvarna
A Class
I have a gas tank problem. I was boiling gas and having too much pressure in the stock tanks of my TE511. I've wrapped my header pipe and lower fuel tank but was still having pressure build up. I drilled a small hole in the valve on the vent tube to see if that would work. Bad idea. Now I leak out too much gas. Anybody been successful with this issue or have a suggestion?
 
To me the upper tank vent tube looks like it could easily get pinched. I think I trimmed mine and make sure it was routed to as to avoid pinching between the body work. I have never had the problem of boiling fuel or tank pressure build up (don't have header or lower tank wrapped either) and have done lots of slow speed 1st gear tech trails in hot weather. I do use XF coolant and run 1150cc oil at all times.
 
Yeah, I switched to the XF coolant and wrapped my header too. It's a little less hot now but I was having my fuel overheat and pressure build up in the tank. I will have to take another look at the vent hose itself but I don't think it's pinched since I'm losing fuel out of it now.
 
Most likely, your vent tube is either clogged with dirt or your one way valve is not releasing gas properly.
 
Someone gave me the idea that maybe when the dealer removed the charcoal canister that they plugged someone they shouldn't have. It does have a plug where it was connected. Is this correct?
 
Hello, probably I have a similar problem. After a ride in tight woods with fuel boiling I've found my fuel cock in upper tank (black) wet with sand on it. First thoughts - damaged cock after fall leaking or during fall cock leaked a small amount of fuel. But then I found this article and remembered that fuel boiled during the ride, and we've crossed a small river, so probably my vent hose could be clogged or pinched or vent valve not properly working.
So, could all factors above caused a high pressure in upper fuel tank with cock leaking as a result?
Thank you
 
The upper tank is just gravity feed with vent to the lower tank. The vent line runs up under the fender by the tail light. You'll see a green and black check valve back there. Follow the line back down as it runs through the sub frame and check for pinches or kinks. Blow through the check valve and ensure it is working correctly. Also remove any particles around the petcock valve and then exercise it from fully closed to fully open. If it isn't smooth or you notice any leakage, it's time to repair/replace that valve.
 
Huskynoobee said:
The upper tank is just gravity feed with vent to the lower tank. The vent line runs up under the fender by the tail light. You'll see a green and black check valve back there. Follow the line back down as it runs through the sub frame and check for pinches or kinks. Blow through the check valve and ensure it is working correctly. Also remove any particles around the petcock valve and then exercise it from fully closed to fully open. If it isn't smooth or you notice any leakage, it's time to repair/replace that valve.
Click to expand...

Thank you for your reply. Excuse me for my English - I need some clarification: - green and black check valve - it's a one-piece round box (green and black) which both sides connected to the hose situated close to the filling-hole, correct? Do I have to disconnect the hose from tank and blow through the hose or open the box and then blow through the half of the box?
 
Tinken said:
You only plug off the brass connector on the manifold, everything else is left open.
Click to expand...
Hi Tinken, does the valve in the vent hose let the extra gas/vapor from the fuel tank go outside or it let the air go to the tank to replace the emptiness? Thanks
 
I believe it allows air to pass, but not allow fuel out. I vent mine to my air box to keep debris out.
 
Yurii, that is the right thing. Just take it off both hoses (keeping in mind correct direction for air flow) and blow through. As Tinken said it's a one way valve air should go in but fuel should not go out.
 
mlorenzini said:
Someone gave me the idea that maybe when the dealer removed the charcoal canister that they plugged someone they shouldn't have. It does have a plug where it was connected. Is this correct?
Click to expand...

My dealer did that exact same thing on my 500exc. The vent line was capped off on the bottom where you were supposed to periodically drain off residual overflow. When they took off the canister there was no longer a vent to atmosphere. Pressure would build up and the bike would vapor lock and stop running because it was starving for fuel.
 
Huskynoobee said:
Yurii, that is the right thing. Just take it off both hoses (keeping in mind correct direction for air flow) and blow through. As Tinken said it's a one way valve air should go in but fuel should not go out.
Click to expand...


My Husky te310R came from the dealer with the check valve in the tank vent line (the one connected to the top of the gas cap) installed backwards,such that pressure could leave the gas tank but air could not get in to replace the fuel that had been burned by the engine. Shortly after starting, the bike would start to run poorly.
 
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