Fuel gauge again?

[Cab-ova pete]

Hi all, I have a question, how much £s does a tank on a 97 2.5 to 4x4 hold? My gauge was reading as good as empty so I put some diesel in,£51 and it was coming out of cap! I have watched the gauge move from half tank to empty after I cleaned the sender unit and it has been fine! No jumping up and down on gauge. Since I put fuel in on Friday the gauge seems to be all over the place? 3/4 tank after bubbling out of filler cap, 60 miles later(yesterday) it's reading just under half and today it's reading just under 3/4? It seems to mess up everytime I put fuel in? Your help is much appreciated

[Simon Jones]

I believe the capacity is around 65 litres. Difficult to equate that to cost as it depends how much fuel is in your area. At 120p/l it should cost £78 to fill it from empty.

[winchman]

Unless the earthing is good on them they can read all over the pace.
I have seen one that had a bad earth in the actual sender unit so had to cave a cable fitted in the tank to earth the top of the sender to the bottom, worked perfect after that

[Cab-ova pete]

Hi Simon, that helps, well my Sunday pm maths are calculating at £1.20/ltr which means I have put 43ish Ltrs?? I will have to see how the needle moves? Thanks for that simon that's also interesting aswell winch man, I have earthed the tank to the chassis a few weeks ago and after that not working I cleaned the s unit and thaughts it solved but I've relied on it til a rough start Friday on empty on gauge and like I said as soon as I put fuel in it went all over the gauge?

[winchman]

If you take the sender out and measure the resistance as you move the float you may see its too high.
Heres a picture of what I did to solve it.


Basically I had added another earth to the actual sender variable resistor in the tank

[Cab-ova pete]

Thanks for that winchman, I will have a go at that! Brill matey