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Rares Fuel sender unit. Issues?

Im not sure what is going on with my sender unit. The car gauge works fine, thats an easy test.I replaced the original sender unit as the cork had disintegrated, with a new rares unit. It would work from full but after about halfway on the car fuel guage, it would not read lower. Just stay around half . Pulled it in and out of the tank a couple of times with no change.
Rares replaced the unit without a problem. It seemed to work for a while but the guage in the car suspiciously didn't flicker while driving as they usually do and I thought i'd better check it out. Lucky I did. The bloddy tank is empty! but the guage reads half.

Are there issues with these sender units? am i missing something? These are pretty simple to install so i'm out of ideas. This is the second unit.
any ideas?
thanks
Alby
PS - (Ive posted this on another site but im hoping someone here might be have had some experience with this issue)

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Hi Alby,
If you would care to give me a call tomorrow on 03 9305 4000 I would be happy to try to help sort out the issue.
Cheers
Dave Ryan Rares Melbourne

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Will be in touch shortly

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Make sure the tank earths properly.

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T

My Shed

Holdenpaedia, they're the brakes Mate.

These Asian fuel senders are notoriously inaccurate. I have re-calibrated plenty of them to where they should be, but they can't be relied upon out of the box.

They need to have the resistor sweep calibrated as well as the float position in relation to the sweep.

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How do you calibrate them?
I have one I have recently installed in an HZ wagon ( pain in the arse to swap due to dropping tank out)
It reads over full when full, then when it gets to approx. half tank it says empty and doesn't move....

So whats involved in recalibrating? can I do it or is it a specialist job?
cheers

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[http://gallery.oldho...|LC GTR 1970s Shed]

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T

My Shed

Holdenpaedia, they're the brakes Mate.

this is why i have hesitated buying one heard they leak too
lately i have stopped buy rare spares parts due to poor quality

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