Just to let people know I had a dodgy gauge that read 1/2 then somewhere around a quarter when I knew it was full. After some testing finally worked out is was the earthing to the tank as when I put an earth from the battery to the plate on the sender it read full. So added an earth wire which I've attached one end to one of the studs holding the sensor on the tank and the other to the handbrake cover holder as it needs to be below the plate below the seat as there is not gap tpo get a cable up into the cab. I did have a hole under the drivers seat which I hoped to use but it wasnt a good earth and still read 1/4 full so back to plan B. All good now.

That's interesting. I have a fuel gauge that reads only occasionally and then only to half full when I know its full. I'm going to try that.

If you lift up the drivers seat you'll see a panel covering the fuel tank. If you remove the screws (you will need to push the seat frame fully forward to access the 2 rear ones) and remove the plate you will see the top of the tank and the sender. I unscrewed all of the studs holding the sender and lifted it out but whatever I did to the float the gauge didn't budge. I then put an earth direct to the plate on the sender and it starting going up hence then adding the earth wire which I attached to one of the bolts holding the handbrake rubber gaiter on - all fixed now. Just need to find out why I'm losing fuel now - was full (could see it in the filler tube) but a week later its not visible down the tube at all? Cant smell petrol under the truck so no idea where its going.

John S said:

That's interesting. I have a fuel gauge that reads only occasionally and then only to half full when I know its full. I'm going to try that.

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+1 my s1 gauge is the same shows empty most of the time but on good days it will go to between a quarter and a half, so I shall be giving it a go too

Thanks. I'll try that.

Hi my fuel gauge has stopped working altogether any advice on how to get it going again? Thanks

Check the earth and the feed on the sender first and then have a look at the sender. Easy if you have a multimeter, just a bit of logic required to isolate the problem.