Thanks for the feedback lads. I will bite on the bullet then and get the multitester out. Thought it was best to check if there was a known fault on these models that may have saved a lot of hassle troubleshooting
had same problem, but thankfully it is sorted. 1 time it would show full and the next it would show empty even after I fill up. What I found after stripping a few things off was that the terminals under the tank for the sender unit were a bit green and the rubber cover was twisted. Dismantled the tank, cleaned the terminals, untwisted the rubber cover, put a piece of sponge on the frame where the fuel pump is as when the tank is lowered the terminals maybe touching and earthing against the crossbar under the tank. Did all this and since then had accurate readings on my gauge.
Had a similar problem recently and fixed it over Christmas, forgot to take a few pictures.As most may know it uses a potentiometer which changes resistance as the level of fuel drops. It has a small levers which rotate across a resistive track to change the resistance. Sometimes the tracks wear or the lever wears in the holder.I removed the sender unit and the bar which holds the float felt like it had to much play on the potentiometer side. This is held in place with a spring washer with a washer under it.Using a pliers I pushed the spring washer down more to tighten it up and it appears to have resolved the problem.
No I have not got round to it yet. I'll post on here when I do, probably over the weekend