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March 14th, 2011, 08:33 AM   #1
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70deg aux tank leak

Hi All,
I've had a 70deg aux tank fitted on my 390 Berg for a few months now and last weekend I noticed fuel running down the side of the bike from under the seat. The leak only occurs when the bike is filled to the brim which made me think that the tank vent was the culprit, but I've traced it to a red screw in cap under the ECU. The leak eventually stops after using a litre or so of fuel.
Pics of the aux tank on the 70degracing website have no red screw in cap where mine does, perhaps I have an early production tank ??????
Anyone else had a leak from a tank fitted with the red screw in cap and how did you fix it ?
Perhaps DaleEO has some words of wisdom for me !
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March 14th, 2011, 07:21 PM   #2
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Re: 70deg aux tank leak

Originally Posted by Wiggy
Hi All,
I've had a 70deg aux tank fitted on my 390 Berg for a few months now and last weekend I noticed fuel running down the side of the bike from under the seat. The leak only occurs when the bike is filled to the brim which made me think that the tank vent was the culprit, but I've traced it to a red screw in cap under the ECU. The leak eventually stops after using a litre or so of fuel.
Pics of the aux tank on the 70degracing website have no red screw in cap where mine does, perhaps I have an early production tank ??????
Anyone else had a leak from a tank fitted with the red screw in cap and how did you fix it ?
Perhaps DaleEO has some words of wisdom for me !
Hey Wiggy this is John Wiser, you actually have the latest version. That plug is installed by the roto molder, it was added to have another vent. You see a regular tank has a large fill hole to vent during the manufacturing process. Ours only has the hole where the light green cap is, this is the only real reason its there besides a possible burp or vent location during a quick fill. Anyhow you just need to remove the cap, clean the threads and make sure the cap and hole are dry then install with some teflon. Just tighten until it is just below flush. Let me know if this doesnt work. Thanks
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March 15th, 2011, 11:34 PM   #3
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Re: 70deg aux tank leak

Thanks for the reply John.
I've done as you suggested with yellow teflon tape, but after testing it with dishwashing detergent and gently blowing compressed air into the tank, I'm not confident about the integrity of the teflon tape as bubbles appeared around the cap. I'll fill the tank with fuel and see what happens then.
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March 16th, 2011, 05:26 AM   #4
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Re: 70deg aux tank leak

Hi Wiggy,

I have a question for you. When you installed your tank, did you remove the ball check valve in the stock gas cap as per the instructions?

And, are you running the stock inline check valve from the stock tank cap vent before it attaches to the frame?
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March 17th, 2011, 06:57 AM   #5
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Re: 70deg aux tank leak

Dale,
I still have the ball in the fuel tank filler cap. I left it in there as the instructions only recommended it's removal Aussie Bergs don't have an inline check valve from the stock tank cap vent before it attaches to the frame, where US bike do.

I'm not convinced it's a case of pressure buildup inside the tank forcing fuel out through the screw in cap. The subframe tank vent line is clear, so any pressure build up will be vented quite freely to atmosphere.
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March 17th, 2011, 08:54 AM   #6
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Re: 70deg aux tank leak

Originally Posted by Wiggy
Dale,
I still have the ball in the fuel tank filler cap. I left it in there as the instructions only recommended it's removal Aussie Bergs don't have an inline check valve from the stock tank cap vent before it attaches to the frame, where US bike do.

I'm not convinced it's a case of pressure buildup inside the tank forcing fuel out through the screw in cap. The subframe tank vent line is clear, so any pressure build up will be vented quite freely to atmosphere.

So if it's recommended why didn't you do it?
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March 17th, 2011, 09:27 PM   #7
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Re: 70deg aux tank leak

Dale,

Have you heard of any pressure build up problems when using the billet Husaberg gas cap?
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March 17th, 2011, 10:45 PM   #8
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Re: 70deg aux tank leak

Thinking about buying the 2011 fe570s, Is the 70 degree worth the money and do you think I can get 80-100 miles by adding this feature..Thanks
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March 17th, 2011, 11:59 PM   #9
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Re: 70deg aux tank leak

I think it is very much worth it, of couse I have one so I might be a little bias!
I have never gotten more then 65miles out of a tank of gas on either of my Berg's but some people have gotten that and more. If you were hoping to get 100miles out of a tank I would say the subframe tank is a must have for you IMO.
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March 18th, 2011, 05:30 AM   #10
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Re: 70deg aux tank leak

Originally Posted by jbrown15
Dale,

Have you heard of any pressure build up problems when using the billet Husaberg gas cap?
Hi J,

No pressure problems with the billet aluminum cap, it has a straight through hole with no check valve.
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