Wanted, fuel level sensor B4 750 Brutale - Page 2 - MVAgusta.net
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post #11 of 16 (permalink) Old 10-16-2019, 08:03 PM
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post #12 of 16 (permalink) Old 10-17-2019, 08:38 AM Thread Starter
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Yeah, thats the same as for my link, the small cylindrical capsule type. So, does this install into some sort of housing or holder in the MV's case?
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post #13 of 16 (permalink) Old 10-17-2019, 10:24 AM
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Quote:
Originally Posted by brutant View Post
Yeah, thats the same as for my link, the small cylindrical capsule type. So, does this install into some sort of housing or holder in the MV's case?
The later model fuel pumps look like they would just pop right in. The older ones may require minor modification to run the wires correctly.

You may want to check out this post on the Ducati.ms forums. They use a similar set up for the fuel light and I have used this information successfully to fix one (on a Ducati).

You would have to check the resistances required to trip the light on the MV to ensure the right thermistor is chosen, but it would <$2 fix at that point.
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post #14 of 16 (permalink) Old 10-17-2019, 07:59 PM
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Yeah, thats the same as for my link, the small cylindrical capsule type. So, does this install into some sort of housing or holder in the MV's case?
brutant;
Yes, it sits in a plastic holder......it's just to control how deep the fuel is when the light comes on
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Last edited by theknurl; 10-17-2019 at 11:06 PM.
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post #15 of 16 (permalink) Old 10-18-2019, 02:55 PM Thread Starter
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Bike is now off the road for winter so I think I'll have a mess with the OE thermistor housing to extract the actual thermistor then install a suitable replacement. Give me carbs and a reserve tap anytime!!
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post #16 of 16 (permalink) Old 01-10-2020, 06:06 PM
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@brutant Here are a couple videos I found that helped me understand and get a visual on how (1K) NTC thermistors work with fuel...

The first short vid shows a new thermistor being soldered into a generic sensor that had been taken apart. Then shown 'bench' tested:


The second longer video has good explanation and demonstration:


Also copied failure mechanisms to help diagnose (I think my own fuel light falls in the second category):

"Identifying and replacing broken thermistors will help to prevent secondary damage to other systems.

1. The most common failure is an open circuit. These failures can arise because of mechanical separation between lead materials and resistor elements. Separation occurs because of handling damage, high/excessive heat, and thermal mismatching.

2. The second most commonly experienced issue with thermistors is drifting in the resistance value. This problem begins to occur as the thermistor ages, as well as when parameters change. This problem will cause inaccurate measurements, which in turn will prevent the thermistor from providing correct thermal compensation.

3. The least common failure mode is a short circuit."

I hope this information is accurate and helpful...those with greater knowledge, let me know and I will edit or remove content if needed.

Last edited by MVF4S750; 01-20-2020 at 05:22 AM.
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