Fuel gauge sender 110/Defender.

**wovenrovings** · 1st February 2009, 05:43 PM

Can any on tell me if they are the same resistance range?

The reason i ask is my fuel gauge has been annoying me because it doesn't read very reliably. And what i found is my tank (in a 1984 110) has what i believe is a defender sender. The fuel pickup goes in the same hole as the gauge sender. The tank also has a blocked of pickup in the top. I measured the resistance range of the sender and it was about 12ohms to 315 ohms. With float right up the gauge reads full, with it right down the gauge reads 1/4 left. So does the old sender have more resistance or is my gauge (in the dash) a bit dodgy?

Dan.

**JDNSW** · 1st February 2009, 06:16 PM

Problems with the fuel gauge on 90/110/Defender are almost always earth problems These can be any of :-

sender to chassis
Chassis to body
chassis to engine
body to instrument cluster (if this is the problem, instument lights on/off will change reading)
Gauge to main instrument cluster earth (in my experience the most common)

John

**wovenrovings** · 1st February 2009, 06:22 PM

Thanks JDNSW.
So the senders are the same resistance?

**LoveMyV8County** · 8th February 2009, 10:02 AM

Dan

I have the exact opposite problem to you!

I suspect mine is caused by having a Defender tank with a County sender as the previous owner had just put in a new tank (90 litres?) before I bought it.

My fuel pickup is also in the same hole as the gauge sender.

When filled to the brim it reads about 3/4, and when reading utterly, completely, even less than empty it still has at least 1/4 left.

Have not measured the resistance as addressing it has been a future project.

I don't think it's an earthing problem as the gauge reads sensibly just with a displaced measurement.

Perhaps we could come to some arrangement!

Chris

**wovenrovings** · 9th February 2009, 07:54 AM

Well maybe we can. If you are able to measure the resistance of you sender in both the full and empty postions we can compare.

Mine is 12ohms full and 315ohm when empty.

Dan

**JDNSW** · 9th February 2009, 09:29 AM

Originally Posted by wovenrovings

Thanks JDNSW.
So the senders are the same resistance?

Sorry about being slow to answer this - I don't know the answer to this, but it would be unlikely to have changed exactly when the Defender name was introduced.

John

**wovenrovings** · 9th February 2009, 09:32 AM

No worries JDNSW, you wouldn't know when they started making the fuel pick part of the send would you?

**JDNSW** · 9th February 2009, 09:38 AM

Originally Posted by wovenrovings

No worries JDNSW, you wouldn't know when they started making the fuel pick part of the send would you?

No. But fuel pickup and sender are combined on my 1986 110, and I suspect on all Isuzus.

John

**spudboy** · 9th February 2009, 10:19 AM

Originally Posted by LoveMyV8County

Dan

I have the exact opposite problem to you!

When filled to the brim it reads about 3/4, and when reading utterly, completely, even less than empty it still has at least 1/4 left.

Chris

Chris, have you checked the position of the float? You can bend the rod that attaches the float to the rheostat, and that changes the gauge reading.

I had a similar problem to you with 10-15 litres still in the tank when it showed empty, so I took out the sender, bent the rod so it sat higher up the rheostat and improved it 100%. Cost nothing too! (Except an hour or so to get the sender out/in).

Mine was a TD5 130.

**wovenrovings** · 9th February 2009, 11:18 AM

JDNSW, ok, it is just that i once had an 86' county (isuzu) too and it had the fuel pickup separate. I will ask my dad and see what his has.

Also i was thinking about it along the earth problem lines. If my guage is reading higher than it should, that may mean that the voltage it is being supplied is too high. (something i hadn't thought as being realated is the temp gauge now has sat 1 needle width higher for a little while now). So... i am guessing there is some sort of voltage stablising device for the instruments? If so i was thinking where is this device, what does it look like and what voltage should it be putting out?

Cheers,
Dan.

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