UK Monster Owners Club Forum » .: Technical :. » Mods & How To's » Repairing the low fuel warning light.

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Old 20-09-2021, 01:42 PM   #31
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I think the OE thermistor-based sensor takes around 30-40 seconds of exposure before it triggers the light so maybe try, say, 20 seconds to accommodate any 'sloshing' and work from there.
Thanks. Yes, when I tested one it took at least that.
Really, the longer the better, within reason, a couple of minutes even isnt going to use significant amounts of fuel that you'd be left stranded, and it would put it beyond doubt for false triggering.
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Old 22-09-2021, 05:34 PM   #32
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Confirmation that the conversion works on an i.e. model sender.
Working prototype. A finished version would have a shorter and neater sheathing to the module.
Thanks to Davey (Rostrumorhospit) for the donor.
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Old 22-09-2021, 06:12 PM   #33
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Patrick - the "just replace the Thermistor" is a viable repair though ? I haven't missed anything to say it isn't or have I missed something ?

Since there is no reserve switch, a reliable Low Fuel Light is a real need on Doris. I'd rather not pay for a OEM part when I need one.
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Old 22-09-2021, 06:16 PM   #34
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Patrick - the "just replace the Thermistor" is a viable repair though ? I haven't missed anything to say it isn't or have I missed something ?

Since there is no reserve switch, a reliable Low Fuel Light is a real need on Doris. I'd rather not pay for a OEM part when I need one.
Probably but Ive never really pursued it
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Old 28-09-2021, 07:20 PM   #35
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A bit more messing around on a rainy day and waiting for stuff to arrive to finish off the M900.

I have now developed a much smaller module (based on a 555 timer chip to control the on delay).

This will fit inside the OEM Fuel sender body (plastic type)

The only outward difference to OEM would be an earth tag, otherwise it would plug straight into the OEM loom Superseal connector.

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Old 28-09-2021, 08:34 PM   #36
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You are a very clever chap with electronic bits
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Old 28-09-2021, 08:41 PM   #37
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You are a very clever chap with electronic bits
Theres nothing that Google wont tell you!!
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Old 14-10-2021, 03:34 PM   #38
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Update in use
I have been out and about on mine and running at various fuel levels in the tank and the sender is working perfectly when it gets to the critical level it comes on and goes off and on again every 30 seconds and then after 4 or 5 miles remains on permanently.
I haven’t yet tested what the mileage available is after it comes on.
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Old 24-10-2021, 11:43 AM   #39
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Another one complete.
VIDEO
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Old 16-11-2021, 11:51 AM   #40
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Just an update to say that ive been running the reworked fuel sender for a month or so now. However with a full tank and not much riding I hadnt reduced fuel enough for it to trigger.
Today I drained the tank (needed some mower fuel) and the warning light duly came on.
So its survived a month immersed in fuel

VIDEO

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Last edited by PPuxley; 16-11-2021 at 12:34 PM..
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