98 VFR800 Has a pressurised fuel tank

[Drtmonster]

Hello, I've only had my new 98 Gen 5 a week.  One of the first things i've noticed is, when opening the tank it is pressurised on the inside and makes a puffing sound as it opens.

 

Has anyone else had this problem?

 

I assume there is a vent somewhere that maybe blocked.

 

Thanks

 

Drtmonster

[BusyLittleShop]

Pressurize is not the worry... vacuum is... because if the vent plugs the fuel pump

will create enough vacuum to collapse the tank... I've witnessed a VFR tank collapse

after the gas cap vent clog...

[Terry]

The vent is through the small hose plugged in from underneath, not the fuel cap. I would check the hose hasn't been plugged, or kinked, first.

[interceptor69]

I recently had the tank off doing a spark plug change and when replacing the tank clamped the metal hose holder too tightly over the hose and noticed on the next ride a strong vacuum when trying to open the gas cap.  Loosened the clamp thingy and no problems.  The vacuum was so strong it was difficult to lift the gas cap.

[Ughandi]

Aftermarket gas caps (like the one from vortex) typically have venting built-in. I have had great experiences with them, but some folks have spicy opinions on them, so YMMV if you want to go that route.

Can be found for cheap on ebay.