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June 15th, 2017, 03:52 AM   #1
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Venting Diy subtank

Hi all,
I have just converted my standard subframe into a tank on my 2010 fe450everything is nice and fuel tight .
My question is when I fill main tank rear tank fills quite quick and once the levels equlize fuel is pushed into the vent line up to the fuel cap level.
Once fuel is burned off there is fuel left in the low section of the vent where it goes down under the intake boot and up to tee piece .
And won't draw any fuel back into the main tank as it has fuel blocking vent line
I have only tested this in the shed and not ridden the bike yet I want to get it right before putting it through its paces.
Would love to hear from people that have converted tanks or have expirance in this task.
Thanks in Advance
Husaberg
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June 15th, 2017, 05:18 AM   #2
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Interesting question. I have a 70-degrees subframe tank - let me know if I can supply with you with pictures, measurements, or make experiments on it.
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June 15th, 2017, 12:36 PM   #3
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Make sure to remove the one way valve in the fuel cap. If not it will not level out between the tanks.
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June 15th, 2017, 01:36 PM   #4
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Thanks for the reply Tourist is your subtank vent a one way valve or
Straight though? I guessing the angle
Of the bike and momentum in use may push fuel back in to subtank
And clear vent.
Does your vent line fill up to main tank height/full to the filler cap?
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June 15th, 2017, 01:37 PM   #5
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Thanks Jon
I have removed the check ball from the cap.
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June 16th, 2017, 05:22 AM   #6
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Originally Posted by Jusaberg View Post
Thanks for the reply Tourist is your subtank vent a one way valve or
Straight though? I guessing the angle
Of the bike and momentum in use may push fuel back in to subtank
And clear vent.
Does your vent line fill up to main tank height/full to the filler cap?
No idea Haha. I'll have a look. The bike's not stored where I live atm; I'm planning on doing some nuts and bolts this weekend and will take pictures and take a look at the fuel routing and see if I can't build an understanding
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June 16th, 2017, 09:36 AM   #7
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There shouldn't be any one way valves to the subtank as air (and fuel) must be able to move both ways to fill the tank and deplete it. And yes, some fuel will go into the line when you top up the system but gravity and two way communication through the vent will drain it eventually when the level comes down.

I made my own subtank but I wasn't as lucky as you as mine was sweating fuel from the two highpoints at the back. So I was lucky to be one of the last to order a 70 degree tank.

Re-reading your first post again.. I did abit different vent routing so I have no lo-points. I can take pictures later but I routed my vent line on top of the air filter. But eventually I think your level in the subtank will level out as the pressure difference will suck out the fuel in the vent line.

Last edited by jon andersson; June 16th, 2017 at 09:41 AM.
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June 18th, 2017, 02:41 AM   #8
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Thanks Jon
I'm going to test out next weekend. I'll give it a serious run over some nasty rocky tracks and see if I can get something to fail before I do my 2 day 360k loop.
Thanks for the advice.
If it works maybe I will post up some pics on how I did the conversion and fittings used some may find it helpful as I have access to some handy tools that made fitting / conversion easier.Also some do,s and don'ts that I learnt along the way.
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