gstallons 784 Posted February 22 Report Share Posted February 22 To the best of my knowledge , this is a capacitive type sensor and you don't test with a meter or the way you normally test . I replaced mine because of fuel leak and irregular operation . The terminal contact was broken on one terminal . After getting a used one with the wrong connector . I tried swapping connectors , wrong terminals & all kinds of mess , I went through about 10 wiring harnesses and found a terminal that somewhat worked . Hmmmmm . I will check the old sensor by dipping it into fuel and test it & I will let you know what I find on how to test and what is a good reading . 1 1 Quote Link to post Share on other sites
Chuck 1,529 Posted February 22 Report Share Posted February 22 Just put an ohm meter on the leads. "Some" resistance? It's ok. Naturally, open or shorted.. not so much. 2 Quote Link to post Share on other sites
docc 3,760 Posted February 22 Report Share Posted February 22 Pretty sure I just saw one on US ebay. edit: I see three: https://www.ebay.com/itm/moto-guzzi-v11-sport-lemans-fuel-level-sender/324479724769?hash=item4b8c7face1:g:vXwAAOSwT~dgIYfV This one is from a '99EV: https://www.ebay.com/itm/99-Moto-Guzzi-V11-V-11-EV-V11EV-gas-fuel-level-Sensor-sending-unit/273583812267?hash=item3fb2ddaeab:g:H48AAOSwg-tb~oTihttps://www.ebay.com/itm/99-Moto-Guzzi-V11-V-11-EV-V11EV-gas-fuel-level-Sensor-sending-unit/273583812267?hash=item3fb2ddaeab:g:H48AAOSwg-tb~oTi And NOS, $119.99US: https://www.ebay.com/itm/Genuine-Moto-Guzzi-V10-Fuel-Level-Sensor-Sending-Unit-GU01103001-2688/293933931228?hash=item446fd3dadc:g:n98AAOSwgPtf7ObP 1 Quote Link to post Share on other sites
gstallons 784 Posted February 22 Report Share Posted February 22 I just checked my old( IDK if it is good/bad) one and it checked 1.4k ohm and nothing on capacitance scale . The resistance wet up to 1.8k after a dunk in gasoline . 0 in cap range . INSPECT your connector terminals before doing anything . Yes , I got a used one but it had a different connector/terminals than the 03ish bike I was working on . I was going to change the connector/terminals to Weatherpack and couldn't find ANYTHING til I got finished w/the job . 2 Quote Link to post Share on other sites
Kiwi_Roy 413 Posted February 22 Author Report Share Posted February 22 The sensor is a thermistor, no capacitance at all just resistance that changes with temperature, yours read 1.4k because it was reasonably warm then you dipped it in fuel and cooled it down. I just went through this again with a V7 owner, he took the regular speedo off snd wanted to use a 12 Volt LED in its place. He tried using the LED directly with his sensor but of course found it was always lit. I tried to talk him into using an incandescent like the VIIs use but he wasn't having it Measuring the sensor on my V7 the thermistor is ~1,800 Ohms when cold (it will vary slightly depending on your fuel temperature) When the fuel drops below the sensor the V7 sensor starts to warm slowly until it's only around 90 Ohms. You have to be really careful not to supply too much current as the sensor will just keep getting hotter and hotter until it fuses in a puff of smoke, the small lamp that the VII comes with is nicely balanced for the sensor, as the current goes up it lights and the current falls back. The V7 dash does a similar thing electronically, it limits the current to 75 milliamps. I worked out that 150 Ohms was a good value to use in series with the sensor, it will pass enough current to warm it up but not enough to fuse it, the 12 Volt LED is wired in parallel with the resistor, it doesn't draw anything when the sensor is cold but is reasonably bright when the sensor warms up 2 1 Quote Link to post Share on other sites
swooshdave 735 Posted February 22 Report Share Posted February 22 Is it possible to use the V7 thermistor with the V11? Quote Link to post Share on other sites
Kiwi_Roy 413 Posted February 22 Author Report Share Posted February 22 It doesn't come on a stick like the VII ones but I'm fairly sure its value is the same, it would certainly work with an in tank fuel pump. You could adapt the V7 one by carving open the stick to access the connections. I would try to avoid having to re-make the tank seal. 1 Quote Link to post Share on other sites
gstallons 784 Posted February 23 Report Share Posted February 23 Whew , in four days , this conversation will be six years old .... Quote Link to post Share on other sites
LowRyter 702 Posted February 23 Report Share Posted February 23 All I can say, when your replace it, expect the fuel light to come on about 20-30 miles sooner. Quote Link to post Share on other sites
gstallons 784 Posted February 23 Report Share Posted February 23 Bram , search for a used unit for your bike on eBay or something similar where you live . Read this entire thread for a good education while you're not doing anything . Whatever you get , make sure it has the same connector ! 1 Quote Link to post Share on other sites
docc 3,760 Posted February 23 Report Share Posted February 23 14 hours ago, BramF said: Is there any new info on a replacement for the fuel level switch? After taking my tank apart in order to get it painted it seems as the switch has given up. I've tried testing the fuel light by powering it directly and that lights it up nicely so I'm suspecting the fuel level switch of causing the fuel light to no longer work. @BramF, a broken wire at the sensor is probably most common. Especially after some "handling." Resoldering the wire to the sensor base, then applying an epoxy retention blob (I'm sure there is a better technical name for that known method!) may save the day . . . 1 Quote Link to post Share on other sites
docc 3,760 Posted February 23 Report Share Posted February 23 18 minutes ago, docc said: Broken wire at the sensor is probably most common. Especially after some "handling." Resoldering the wire to the sensor base, then applying an epoxy retention blob (I'm sure there is a better technical name for that known method!) may save the day . . . Oh, hey: " strain relief ! " Quote Link to post Share on other sites
BramF 10 Posted February 23 Report Share Posted February 23 Thank you all for the good suggestions Will investigate the fuel sensor connection this weekend and report back to you all. 1 Quote Link to post Share on other sites
BramF 10 Posted February 28 Report Share Posted February 28 So i checked the sensor wiring and it seem to be connected, also hooked up the multimeter which gave me a measurement of 1,600 ohm. Guess I'll have to keep looking/troubleshooting...😥 1 Quote Link to post Share on other sites
docc 3,760 Posted February 28 Report Share Posted February 28 How low is the fuel level in the tank that you would expect the light to come on? Do the Neutral and Oil Pressure lights come on with the key? (Looking for maybe a grounding terminal left off the battery on reassembly ...) Quote Link to post Share on other sites
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