Fuel gauge not working 1993 300GD any info

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Monman8.
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Fuel gauge not working 1993 300GD I've recently had an issue with the fuel gauge not registering. I've cleaned all the terminals. If I ground out the blue/black wire at the gauge sensor, (top of the fuel tank), the dashboard indication moves up to the full level as it should do. So thus tells me that the sensor is faulty. How hard is it to remove the sender/sensor from the fuel tank. So that I can inspect it's condition. What are the spare option's available. Thanks.
Pistonhead
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Re: Fuel gauge not working 1993 300GD any info

The sensor unit is a common issue. It can be repaired but is a fragile and delegate repair. Once removed from the tank, let fuel within the sender drain out in the tank and when empty pull it out completely.

At the base  of the sender is a small nut (I think 6mm) undo this and pull the base disc out carefully. The tube section can then be seperated but do so in line and do not remove at a tilt.

Inside the tube is a very thin wire and running along it is a white float. Make sure the wire is not broken, I have not come across any broken wires in my experience but more so once you remove the base disc it seperates with a sandwiched disc, prising the discs apart. Once this is done you may notice it clogged up with gunk in the radial channel in the white disc, clean that off and reassemble. Hopefully fuel can re-enter/drain the assembled tube again for the sender unit to register again. 

I would urge one test before reassembly, that is carefuly reattach the sender connections making sure the sensor wire does not get damaged or stressed (It could help if you make some wire extensions to connect this up). Manually move the float up and down the wire and get an assistant to check and see if the fuel gauge registers, if not then you will need to check teh connections on the sender itss elf or you need another unit. Obviously the iginiton has to be switched on for fuel registery.

JASONGDS
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Re: Fuel gauge not working 1993 300GD any info

I did mine about 6  years ago,  sort of bayonet fit, not much space, use something across the flats, small spanner etc, gloves useful as edges sharp. Is a breather attached to the top, might just be gunk, etc blocking float, Mark the alloy tube, as easy to assemble incorrectly,  wonder how I know??? If possible inspect to see if no loose hoses inside tank? Another issue

Monman8.
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Re: Fuel gauge not working 1993 300GD any info
Thank you greatly for your feedback both. I will respond with my findings and hopefully fix it.