Aux fuel tank... on top of tank? - K-Bikes.com - Excellence in Motion
 
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post #1 of 7 (permalink) Old Apr 18th, 2006, 1:04 am Thread Starter
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Aux fuel tank... on top of tank?

I was a bit curious... I've seen several aux fuel tanks that mount on the back rack, in the passenger seat, or even mounted on the back fender... any particular reason nobody's created a "tank fuel bag"? That is, a tank bag (more like a rigid shell than a flexible bag) that actually mounts on the existing fuel filler (such as the type of filler on the K1200GT/RS or R1150RT or many other 'bikes) and just provides an additional 2 - 3 gallons of fuel. It seems that a good seal could be made between the tank bag and the fuel filler, and with proper internal design, gravity would be enough to get the extra fuel from the "bag" to the tank. I guess I'm a bit surprised that no one has come up with that type of design yet, so I'm guessing there must be some specific reason that would not work...
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post #2 of 7 (permalink) Old Apr 18th, 2006, 2:32 am
 
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Well, I guess you could fabricate a connection that would bolt down onto the filler neck. It certainly couldn't sit there like a tank bag. Then you would have to fabricate a cell that would be shaped properly. Next you would have to block the vent and overflow in the top of the stock tank, and move them up into your cell. And there would have to be provision to allow you to remove the side panels for service. Then you have to figure out where your gonna put all the stuff you usually keep in your tankbag.

BTW, I just put a 3 gallon cell on a GIVI rack on the back of my RS, gravity fed.
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post #3 of 7 (permalink) Old Apr 18th, 2006, 5:22 am
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I have to think the extra weight of several gallons of gasoline that high up on the bike would affect the handling pretty badly.

plus, I'd hate to get into an accident and hit a rigid tank with my boys as I was being ejected from the bike. :wtf

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post #4 of 7 (permalink) Old Apr 18th, 2006, 6:21 am
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There's been a lot of posts about fuel cells. I'm nervous from the safety side and 30 lbs extra weight on top of the existing tank seems a bit top heavy to me.

I read the ideas for linking the cell to the main tank, but it seemed a lot of trouble and complexity when you just stop riding for a few minutes and pour in the gas. With front/rear shunts/high sides/low sides a possibility, I would think the rear passenger seat area (If you're not carrying pillion) is the most protected and the weight sits lower in the right place over the rear suspension.



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post #5 of 7 (permalink) Old Apr 18th, 2006, 9:01 am Thread Starter
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Good point about the weight... hadn't considered that.

Where would you put stuff...? It's the same issue regardless of where the aux tank sits. Where do you put the passenger if the tank is taking up the passenger seat? etc.

A well designed "aux tank bag" could very likely address all the other issues... quick disconnect (half turn & lock; obviously it would have to be empty or easily drainable) so that body panel service is simple, shaped so you don't have to worry about "the boys", and with side pockets so you can throw in small things (wallet, phone, etc). But not much you can do about the weight, and I agree that would kill the concept.

Thanks for the input!
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post #6 of 7 (permalink) Old Apr 18th, 2006, 11:21 am
 
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Quote:
Originally Posted by voxmagna
There's been a lot of posts about fuel cells. I'm nervous from the safety side and 30 lbs extra weight on top of the existing tank seems a bit top heavy to me.

I read the ideas for linking the cell to the main tank, but it seemed a lot of trouble and complexity when you just stop riding for a few minutes and pour in the gas. With front/rear shunts/high sides/low sides a possibility, I would think the rear passenger seat area (If you're not carrying pillion) is the most protected and the weight sits lower in the right place over the rear suspension.
My main reason for adding a 3 gallon cell is having a normal range when I pull my Bunkhouse trailer. Gas is ~6.3#/gal, and the 3 gallon cell is within the 22# rating of the GIVI rack. I'm sure the extra range will be handy on my trip to Alaska next month without the trailer.
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post #7 of 7 (permalink) Old Apr 25th, 2006, 11:06 pm
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Quote:
Originally Posted by MikeyD
I was a bit curious... I've seen several aux fuel tanks that mount on the back rack, in the passenger seat, or even mounted on the back fender... any particular reason nobody's created a "tank fuel bag"? That is, a tank bag (more like a rigid shell than a flexible bag) that actually mounts on the existing fuel filler (such as the type of filler on the K1200GT/RS or R1150RT or many other 'bikes) and just provides an additional 2 - 3 gallons of fuel. It seems that a good seal could be made between the tank bag and the fuel filler, and with proper internal design, gravity would be enough to get the extra fuel from the "bag" to the tank. I guess I'm a bit surprised that no one has come up with that type of design yet, so I'm guessing there must be some specific reason that would not work...
I'd like to see something in place of the saddle bags for extra fuel. That'd be neato!

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