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Author Topic: Fuel Tank Low Sensor (External Thermistor) (8 messages, Page 1 of 1)
Moderators: Gordon, High Desert Intruder, navigator

Poll:
Use an insulating pad of foam and epoxy over all.:
1 (100%)
Attach directly to the tank and epoxy over.:
0 (0%)
No, this won't work at all. It has to actually be in fuel.:
0 (0%)
Attach it to the Petcock under the tank.:
0 (0%)
Drill out the Reserve port and put the wires in by threading them through the reserve port. tghis mean you could never close the petcock.:
0 (0%)
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BugsInMyTeeth

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Posted: Jun 4, 2010 12:43 AM  (Msg. 1 of 8)         

I finally found some specs for the Thermistors used INSIDE fuel tanks.

http://www.electronicspoint.com/thermistor-gas-tank-t123318.html

According to the above:
NTC Thermistor TYPE RL2004-582-97-T10
Rated at 1,000 ohms at 25 degrees Celsius.
Cold resistance is between 900 and 1200 ohms.

Per the writers discussion this sensor will not pass current to light the indicator if the is ANY wetness around it.  I've seen where some are coated and some left bare.

My Acewell speedo has an input and indicator for Emergency flashers.  I think I can use that to indicate a low fuel level.  The plkan is to buy some of the above Thermistors and attach them to the tunnel where about 1/2 gallon or so is left in the tank.  That's about 17-20 miles to empty.  A reasonable reserve.

I want to discuss how best to mount the thermistor.  That is the Poll.  I'm leaning towards #2 because i don't want to break the seal of the tank.  This would make sharing this idea harder because many would also be timit to drill holes in the Tank.

If someone beats me to testing this, more power to you.  The Intruder Gods are watching.


Newark has them on sale for $.64 each.
Edited by BugsInMyTeeth on Jun 4, 2010 at 01:29 AM


Email to Jumpsummo@yahoo.com for Expanded tanks on 800 or 1400.

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WintrSol

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Posted: Jun 4, 2010 11:19 AM  (Msg. 2 of 8)         

Seem to me that putting it in the tunnel would generate false fuel low signals, because the tunnel heats up from the engine. To prevent this, you'd need a thermally-conductive epoxy to attach it, then cover it with some good insulation that has a reflective coating.
I guess that would be 1 and 2 combined?
Edited by WintrSol on Jun 4, 2010 at 11:19 AM


Bug Dr

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Posted: Jun 4, 2010 11:49 AM  (Msg. 3 of 8)         

I had seen some fuel tank float sensors that I thought could be adapted and was trying to figure out how to get the wire out of the tank without drilling.  

If you went through the reserve port, how would you seal the fuel from leaking around the wire and do you really think it would last over time?


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Krash

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Posted: Jun 4, 2010 12:37 PM  (Msg. 4 of 8)         

know nothing about them however noticed a friends yamaha maxium 1985 has one
don't know if that's any help.


Skycruiser

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Posted: Jun 4, 2010 04:19 PM  (Msg. 5 of 8)         

How bout making a pressure sensitive rear mount. The less gas, the less weight in the tank.
As the tank lifts up, by way of springs from under the mount,it triggers a relay which could illuminate a light. Maybe even have say 4 relays for 3/4 tank,1/2 tank, and so on.
No holes drilled in tank.

Just a thought.   Of coarse there is the problem of the seat over lapping the tank.


r77r7r

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Posted: Jun 4, 2010 07:56 PM  (Msg. 6 of 8)         

If ya want to look some schematics to get ideas, I had a low fuel light on a fancy dashboard on my 82 Yamaha seca..........

  Bob


BugsInMyTeeth

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Posted: Jun 4, 2010 08:16 PM  (Msg. 7 of 8)         

I know how some are doing it but they already have fuel level sender and it's just added to them.  I could weld a tap on the tunnel and mount it that way.  Just wanted to kick this around a bit and maybe come up with a more non invasive way to mount it.

1.  The thermistor heats up too hot to touch.  The fuel sinks away the heat in a bare mount.
2.  By trapping the thermistor right against the tank I'm hoping it will act in a similar fashion.
3.  The under tank heat is well below the switching temperature.  A bit of insulation would certainly prevent that being an issue.

Thanks for your input.


Email to Jumpsummo@yahoo.com for Expanded tanks on 800 or 1400.

Gbat installed Sep 2007.

http://www.youtube.com/watch?v=Wo3Aj2eqmS8 ; Obama is a fraud.

BugsInMyTeeth

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Posted: Jun 4, 2010 08:41 PM  (Msg. 8 of 8)         

Quote:
r77r7r wrote:
If ya want to look some schematics to get ideas, I had a low fuel light on a fancy dashboard on my 82 Yamaha seca..........

  Bob

Thanks, I've seen some.  Pretty simple really.  Power goes either to the lamp or the thermistor in series back to ground.  When the thermistor is hot it allow current flow.


Email to Jumpsummo@yahoo.com for Expanded tanks on 800 or 1400.

Gbat installed Sep 2007.

http://www.youtube.com/watch?v=Wo3Aj2eqmS8 ; Obama is a fraud.
 

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