Author [NL] [FR] [ES] [DE] [SE] [IT] [NO] [MY] Topic: Fuel tank vaccum - Fuel Leak  (Read 550 times)

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Offline AndrewP

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Fuel tank vaccum - Fuel Leak
on: December 04, 2019, 12:36:43 PM
So, long story short.

Have been having a vaccum noise whenever I opened the fuel tank for as long as I've had the bike (5 months). Yesterday I started getting a fuel leak from the bottom of the tank. The only way to stop it was to leave the fuel cap open.

Took it to the guy that was looking after my Hornet, and after lifting u the tank he just pointed at the vaccum hose. Someone had reseated the tank and the vaccum hose was pinched so no air would go through the hose and into the tank. In addition to this, there was an area on the underside of the tank that had actually deformed the tank itself, possibly due to the constant negative pressure inside the tank.

I'm dissapointed to say the least about the Honda dealership that has been taking care of the bike in the past.

Looking at the vfr forums, I can see this is somewhat common amongst our bikes.
And the Lord said unto John, “Come forth and you will receive eternal life.”
But John came in fifth - and won a toaster.

Offline SXHighwayman

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Re: Fuel tank vaccum - Fuel Leak
Reply #1 on: December 04, 2019, 12:46:49 PM
Hi Andrew,

Can you describe the noise? I hear noises from my tank when I'm in the garage alone and it's quiet. Not loud just faint noises - I thought it was something to do with the electronics then realaised it was coming from the fuel tank.

Offline AndrewP

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Re: Fuel tank vaccum - Fuel Leak
Reply #2 on: December 04, 2019, 12:51:26 PM
It only happened when opening the fuel tank to refuel.

Skids has a thread dating a couple of years back explaining the issue on the 8th gen VFR here: https://www.vfrdiscussion.com/index.php?/forums/topic/86555-vfr800f-8th-gen-fuel-tank-vacuum-problems/

If you watch his video you can hear the vaccum as he opens the tank up.
And the Lord said unto John, “Come forth and you will receive eternal life.”
But John came in fifth - and won a toaster.

Offline SXHighwayman

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Re: Fuel tank vaccum - Fuel Leak
Reply #3 on: December 04, 2019, 01:01:59 PM
Thanks dude will check it out!

Offline SXHighwayman

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Re: Fuel tank vaccum - Fuel Leak
Reply #4 on: December 04, 2019, 01:05:03 PM
Wow - no, nothing like that for me. More like very faint gurgling. Thought I was imagining it at first. Nothing is leaking could be venting/breathing of some sort perhaps.

Glad you got your tank sorted though!

Online Skids

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Re: Fuel tank vaccum - Fuel Leak
Reply #5 on: December 04, 2019, 01:50:37 PM
*Originally Posted by SXHighwayman [+]
Hi Andrew,

Can you describe the noise? I hear noises from my tank when I'm in the garage alone and it's quiet. Not loud just faint noises - I thought it was something to do with the electronics then realaised it was coming from the fuel tank.

M8, totally normal.

The issue with the vacuum tubes usually causes the cap to not want to release so you can't put fuel in. Ultimately, leads to tank collapsing onwards under the pressure differential.
98 VFR800 - 130,000 miles (sold)
08 VFR800 - 76,000 miles (sold)
14 VFR1200 - 20,000 miles
15 VFR800X - 44,000 miles (sold)
18 VFR800X - 9,000 miles

 



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