Fuel tank sender unit 1972 2000 TC

#1
Since owning my car (4 yrs) the fuel gauge has never registered on my dash, so I have had no idea on how much fuel was in the tank. Today I topped it up with hardly any miles driven in 4 years as I was always working on it until today when after a long time in my garage working on various issues, drove to local garage to put some petrol in it and much to my surprise, the petrol nozzle stopped at £22.80 with fuel close to the top of the filler neck.

Question:
Does anyone know what sort of reading to expect from the fuel sender unit in the tank which I will try and measure tomorrow after I finish work? Is this a common failure? I checked the fuel indicator in the dashboard when I had this out and it measured ok, so I am hoping either a broken wire underneath on the fuel sender unit, or worse case, the fuel sender unit. How can I test this? If I ground one side of the fuel sender, will this activate the gauge in the dash to read full?
Any advice welcome.
Thanking anyone in advance.
Regards,
Dave
 
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#2
If t turns out that you need a new sender, JR Wadhams can supply. The one fitted by the previous owner to my 2000 TC is irritatingly non-linear, staying at full for quite a long time then rapidly falling towards empty where it then stays even when there's at least a third of a tank left, but it's better than nothing. Sender failure does seem qute common. Two of the three P6s I have owned have suffered from it.
 
#3
If t turns out that you need a new sender, JR Wadhams can supply. The one fitted by the previous owner to my 2000 TC is irritatingly non-linear, staying at full for quite a long time then rapidly falling towards empty where it then stays even when there's at least a third of a tank left, but it's better than nothing. Sender failure does seem qute common. Two of the three P6s I have owned have suffered from it.
Thanks for the info. The tank is full to the brim and the gauge reads empty and I never had time to crawl underneath to check the connections. As if one would be disconnected. I do try and live in hope...lol
 
#4
That does indeed sound like a sender fault. Grounding the sender's feed wire (green and black) with ignition on should move the gauge needle to full-scale deflection, ie full. If it does, either there's a bad conection to/from the sender, or the sender is non-functional.
 
#5
That does indeed sound like a sender fault. Grounding the sender's feed wire (green and black) with ignition on should move the gauge needle to full-scale deflection, ie full. If it does, either there's a bad conection to/from the sender, or the sender is non-functional.
Thanks for your reply and advice. Finished late, so a job tomorrow and will let you know the outcome, fingers crossed I am hoping for either broken lead or poor connection...yes, pigs can fly!
I live in hope!
 
#7
If t turns out that you need a new sender, JR Wadhams can supply. The one fitted by the previous owner to my 2000 TC is irritatingly non-linear, staying at full for quite a long time then rapidly falling towards empty where it then stays even when there's at least a third of a tank left, but it's better than nothing. Sender failure does seem qute common. Two of the three P6s I have owned have suffered from it.
Sorry for my late reply and many thanks for the direction on where to get one. Been hectic the past few weeks so not had time to check this out as I've been having issues with my 2000 Aprilia RSV1000R since riding back from BSB at Silverstone. Nice a sunny today so might just take Gene (1972 P6 2000TC for a drive.
 
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