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Marty008

Member Since: 10 Jun 2024
Location: Luzern
Posts: 8

2015 Defender 90 Puma 2.2 CSW Santorini Black

Fuel Sender - 2015 TDCi 2.2L Defender 90

Dear Forum,

I suspect an issue related to the fuel sender on my 2015 TDCi 2.2L Defender 90. Based on your recommendations, I initially checked the grounding points and bonding braid of the Defender, particularly around the transfer box and wheel arch. Everything appears clean and secure, so this hasn’t resolved the issue.

The problem seems to be related to incorrect readings from the fuel sender. My gauge consistently shows more fuel than is actually in the tank. The gauge is not stuck at the highest or lowest positions, it just does not drop anymore below the halfway mark.

Before delving deeper—such as removing the tank, fuel pump, or sender

—I would appreciate input from anyone with a Nanocom or similar diagnostic tool. Specifically:

• Could you share the values displayed by the Nanocom for various fuel levels (e.g., full tank, ¾, or ½)? For reference, my current fuel level is near ½, and I am reading a value of 1.6.
• Alternatively, if anyone could provide the resistance values measured on the grey connector under the passenger seat (LHD variant), it would be extremely helpful. Based on the Wiring Diagram (WD), these should correspond to pins 6, 7, and 13 of connector C0390. The ground is located on stud C1964.

Additionally, I understand that the instrument cluster processes signals differently compared to previous Defender generations. However, I assume the signal remains analog and should still be measurable.

Thank you for your insights and support!

Regards,
Christophe

16th Jan 2025 3:50pm

andy63

Member Since: 30 Jun 2023
Location: north east
Posts: 610

I have a 2.2tdci defender and the resistance on the potentiometer was around 50 ohms when full and about 1kohm on empty..
I remember thinking I'd replace the sender which clips on to the fuel tank pump and the price was in between two and three hundred pounds if I remember correctly.. same sort of price as the pump itself, so I hope that's not your issue..

17th Jan 2025 8:22am

Marty008

Member Since: 10 Jun 2024
Location: Luzern
Posts: 8

Thank you ! I’ll investigate a bit later this weekend!

Cheers !

17th Jan 2025 9:15am

Marty008

Member Since: 10 Jun 2024
Location: Luzern
Posts: 8

I investigated a bit further this weekend clean some earth and ground and all seems to be back to normal. Here some pictures about the reading on the Nanocom when the tank is full (55l)

Regards
Christophe

Click image to enlarge

20th Jan 2025 10:26pm

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