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Fuel Tank sender unit

Old 11-13-2018, 03:29 AM
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Fuel Tank sender unit

Hi guys, Iím in the middle of cleaning out a rusty (surface only) fuel tank on an Ď03 VTR1000f - the fuel guage was working fine prior to taking the sender unit off the tank....Iíve got the tank ready to go now and thought Iíd just check the sender unit again before bolting it back onto the tank so I connected it to the wiring harnesses and moved the float up and down...the guage on the dash doesnít seem to change, in other words it just reads empty - flashing- I went ahead and connected it to a multimeter- moves the float up and down and it definitely reads differently according to the float position.....what am I doing wrong????...thanks in advance for your help. Mark
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Old 11-13-2018, 06:36 AM
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Originally Posted by MarkJet View Post
Hi guys, Iím in the middle of cleaning out a rusty (surface only) fuel tank on an Ď03 VTR1000f - the fuel guage was working fine prior to taking the sender unit off the tank....Iíve got the tank ready to go now and thought Iíd just check the sender unit again before bolting it back onto the tank so I connected it to the wiring harnesses and moved the float up and down...the guage on the dash doesnít seem to change, in other words it just reads empty - flashing- I went ahead and connected it to a multimeter- moves the float up and down and it definitely reads differently according to the float position.....what am I doing wrong????...thanks in advance for your help. Mark
Ive not tested a sender like you are on the bench,,so Im just guessing.... But did you ground the sender as it would be bolted to a steel tank, bolted to a frame...?
If not that, and you have in valve spec readings from the sender on the bench...perhaps its a wiring issue between connector (pushed out pin?, broken wire at the back of the connector?)
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Old 11-13-2018, 01:56 PM
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Thanks for the reply, yes I did earth it out when I connected back up to the bike...canít work out whatís going on with it, and all connections seem to be fine....
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Old 11-13-2018, 11:37 PM
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Ok worked it out, nothing wrong with the sender unit...when connected, and you move the float up and down, it takes awhile for it to show on the dash guage - obviously to compensate for the fuel moving around within the tank when riding/leaning into corners etc. 👍🍺
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Old 11-14-2018, 07:18 AM
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Originally Posted by MarkJet View Post
Ok worked it out, nothing wrong with the sender unit...when connected, and you move the float up and down, it takes awhile for it to show on the dash guage - obviously to compensate for the fuel moving around within the tank when riding/leaning into corners etc. 👍🍺
Perfect, I was just thinking of that this morning and came to ask if you had left the sender in position for a min or so... Your assumption is dead on... someplace in the fuel level system after the sender there is a controlled circuit that "delays" the sender signal
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Old 11-14-2018, 02:03 PM
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Cheers mate
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