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ppad



Member Since: 16 Nov 2012
Location: now, UK S Coast
Posts: 220

United Kingdom 2005 Defender 90 Td5 HT Caledonian Blue
recalcitrant fuel guage
On my 2005 truck, fill the tank - gauge says full. It will happily record the first 100 miles to between 1/2 and 3/4. Then it stops. Doesn't move thereafter to empty and beyond, which is too stressful to leave alone.
Where do I start please? Sold the much modified 110 2.8, in Oz
Brought the 90 home from Switzerland ...
Post #1034804 15th May 2024 8:32am
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Mdm



Member Since: 11 Sep 2013
Location: Sunny Lancashire
Posts: 1544

United Kingdom 
pop the tank sender unit out and move it by hand if the gauge works ok then its the sender unit. replace and off you go.

if not then wiring and gauge up front .

the fact it reads ok tends to point to the sender unit failing
Post #1034805 15th May 2024 8:58am
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diesel_jim



Member Since: 13 Oct 2008
Location: hiding
Posts: 6047

United Kingdom 2006 Defender 110 Td5 SW Epsom Green
Mine did a similar thing.... would read OK from full down to about half way, then either drop like a stone or just be really waaay out.

It was due to the dampener circuit in the speedo head (the fuel level feed goes through the speedo).

I just put a wire link in to bypass the damping portion.... OK it made the fuel guage like an old series 2 where it bounces all over the place on rough roads, but at least it read accurately.
Post #1034807 15th May 2024 9:23am
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ppad



Member Since: 16 Nov 2012
Location: now, UK S Coast
Posts: 220

United Kingdom 2005 Defender 90 Td5 HT Caledonian Blue
"pop the tank sender unit out ..." right. I don't have a hole in the floor - yet. I can't see an easy way to do that one. ?
So, start with the inst. panel and wiring / earths there and hope.
Thanks for the suggestions to date. Sold the much modified 110 2.8, in Oz
Brought the 90 home from Switzerland ...
Post #1034824 15th May 2024 11:47am
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Mdm



Member Since: 11 Sep 2013
Location: Sunny Lancashire
Posts: 1544

United Kingdom 
alas no inspection hole means a tank drop if you dont want to cut one.

i would be surprised if its the dash end of the car that's at fault but its a Lr so anything is possible
Post #1034833 15th May 2024 2:38pm
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