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Fuel Fuel Delivery


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March 1st, 2016, 01:19 AM   #1
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AuxiliariTank/Fuelpump Question

Hello My name is Kristian and I'm new to this forum. I have read alot and learned plenty!

I just bought a Husaberg FE 450-08 with 120 hours on the clock. The other day I bought a used alu-auxilirytank that fits in the gap behind the rear suspension. I have not mounted it yet but I'm trying to find info on some technical issues. The outlet of the tank is low and below the carburator so Im thinking I might need an extra fuelpump, is that right or not? If so it should be one that pushes the gas to the carborator, right?

If someone knows please post a line or two. Ill try to upload some pictures later of the bike and tank.

Best regards,
Kristian
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March 1st, 2016, 01:49 AM   #2
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I am not sure, but I believe there is no pump. The surface level in the tank just needs to go down to the surface level of fuel in the carb bowl, if that makes sense? In other words, all fuel in the subtank that is above the fuel level in the carb bowl ... will go into the carb
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March 1st, 2016, 11:28 PM   #3
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Thanks for your answer I apreciate it. So if 25% of the tank is below the carburator it will only use 75% of the gas in the tank. To be able to use all substance I should mount a pump or if possible move the tank.

If no one else knows I'll just do some trial and error. Post the outcome and a picture when done.

Best reg,
Kristian
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March 2nd, 2016, 05:37 PM   #4
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Mount the tank above the carb, this will ensure all your fuel leaves the tank. Just like the normal fuel tank. Gravity feed. I would not force any fuel via a pump into the carb unless you can engineer a shut down when carb is full?
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March 3rd, 2016, 04:48 AM   #5
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Hello FE350!

Thanks for your answer. Yeah that sounds like the solution to go for. The tank is made in aluminium and is a bit "to long". I mean the outlet. It was designed for a Husaberg but the fitting is not perfect. I mean not even close to perfect... I might move the cdi-box to make more room under the sadel to see if that would solve the problem or Ill just put it on the shelf for a while... Unfortunatelly hard to find the old Acerbis mid-frame tanks...

Best regards,
Kristian
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March 3rd, 2016, 10:26 AM   #6
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Hi Kristian and welcome to the site!
It sounds like you've got yourself a subframe tank for a 1999 and earlier FE model. Those models did use a vacuum operated fuel pump because the right-hand side of the main factory tank was lower than the carb. The pump didn't push fuel into the carburetor but pumped to the left side of the main tank above where the petcock was located. Eric's Motorcycle made a fair number of aluminum subframe tanks in that era.
What you have wasn't designed for a 2000-2008 model.

log
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March 3rd, 2016, 01:59 PM   #7
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Hello Log!

Thanks alot for taking the time to write. Nice to see there is so much knowledge in forums like these! You may be absolutely right regarding the tank, although the tank looks VERY "handmade". Could be that some swedish guy saw that tank and tried to copy it. Anyhow it came to me without anything, just the tank, no conections or pump.

But one solution then would be to do as you describe. If I get the tank in the frame and decide to go on with this I could put a vacumpump and send the fuel to my regular tank.

Or I just skip it, put the tank on the shelf for some other project and live with the 9 L of fuel that the main carries... : )

Thanks again for shedding some light to this matter!
Best regards,
Kristian

Last edited by KingofB; March 3rd, 2016 at 02:01 PM.
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March 4th, 2016, 05:36 AM   #8
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You could do what I did when I had the poly 3liter underseat tank.

*not going to be a good idea if you are racing though.


I cut a length of fuel line that is long enough to make it to the main tank fuel filler.
This was coiled up and secured with a piece of Velcro One Wrap, and placed on top of the tank. It is hose clamped to the lower outlet. *the aux tank I had used a petcock on both the outlet, and the vent. The outlet tap I kept closed, the vent, open.

Then from the vent on the aux tank, I ran a line up the frame next to the tank, which then went to a T fitting on a short hose at the cap. On top of that short hose, a standard check valve. *this allows any fuel vapors, or actual fuel to expand and/or slosh around and go to the main tank.

When or if you need the fuel, you uncoil the hose from the outlet, open the lower tap and put the hose end in the main fuel tank.

Then blow on the vent line, to get it flowing from the pressure, and pinch the line untill the fuel slows to a trickle.
Had to repeat around 5-6 times iirc, and it took about 4 minutes to transfer 3 liters.

Sounds like a lot of messing about, but it's better than running out of fuel and pushing your bike.
I only needed that extra fuel a couple times, and ultimatly sold that tank.
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March 5th, 2016, 12:02 PM   #9
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Yeahh wow thats an option!! Thanks for the info!
Best regards,
Kristian
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