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| spudfan Member Since: 10 Sep 2007 Location: Co Donegal Posts: 4473  
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Does a varying fuel gauge reading point to a fault with the in tank sender unit or the sensor unit? 90 300 tdi. 1982 88" 2.25 diesel
1992 110 200tdi csw -Zikali 2008 110 2.4 tdci csw-Zulu 2011 110 2.4 tdci csw-Masai Last edited by spudfan on 21st Sep 2021 2:25pm. Edited 1 time in total |
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21st Sep 2021 1:57pm |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4389 
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It could do, but it might be as simple as a bad/intermittent connection between the sender and the gauge or the earth of the gauge or the power to the sender.
What ere TDI do you have? |
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21st Sep 2021 2:24pm |
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| spudfan Member Since: 10 Sep 2007 Location: Co Donegal Posts: 4473
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Daughter's 90 300 tdi 1999
I was thinking of changing this. https://www.advancedfactors.co.uk/stc1139-...9770-p.asp 1982 88" 2.25 diesel 1992 110 200tdi csw -Zikali 2008 110 2.4 tdci csw-Zulu 2011 110 2.4 tdci csw-Masai |
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21st Sep 2021 2:27pm |
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| karlp606 Member Since: 19 Aug 2021 Location: Hull Posts: 295 
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Check the connection on the sender underneath the drivers lift up panel, maybe a dirty connection.
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21st Sep 2021 2:38pm |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4389
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Ok so start simple. 9 times out of 10 it is an earthing problem.
The fuel sender/gauge system on a 300tdi is a pretty simple bit of kit. The first step is to pull the binnacle and check that the gauge is earthed properly. There is usually an earth lead on the fixing screw, but these loosen or corrode over time. Clean them up and re-fit. Check the rest of the spade connectors are good too. After that it is a matter of checking the connectors on the fuel sender itself. It should only have 2 wires going in, power in (12v) and signal out (variable voltage). Check contacts, clean and refit. It would be worth checking the continuity between the sender and the gauge as well, jiggle the wire a bit to simulate going over bumps, if the continuity is lost then the wire needs replacing back to the gauge. Working? If not then it might be the sender units variable resistor has worn. This will be a remove and replace job requiring a sender, seal and locking ring. |
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21st Sep 2021 2:40pm |
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| spudfan Member Since: 10 Sep 2007 Location: Co Donegal Posts: 4473
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Thank you. I get the checks done next time she is here.
 1982 88" 2.25 diesel
1992 110 200tdi csw -Zikali 2008 110 2.4 tdci csw-Zulu 2011 110 2.4 tdci csw-Masai |
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21st Sep 2021 2:45pm |
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