when I brought the car the level was inaccurate, so I put a new sender unit and still reads inaccurately.
does anyone know of this problem or have any idea as to what the issue could be ?
I have read somewhere if you have a wrong reading it could be too much or too little voltage going from the sender. That's all I remember.
there's a few different models, need more details
a little hard to explain, but (failing your earth being dirty) there are 2 resistors inside your gauge if you open it up. One on either side of the
coil responsible for movement of the needle, these two resistor set the calibration of the gauge.
Measure the resistance of the these and see wether they come up to spec compared to the coloured bands printed on them, if not go down to jaycar and
buy some replacements and solder them in, usually costs about a dollar to recondition a gauge 
Will try and chase down a basic diagram, remember these are very simple machines
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| Originally
posted by nils a little hard to explain, but (failing your earth being dirty) there are 2 resistors inside your gauge if you open it up. One on either side of the coil responsible for movement of the needle, these two resistor set the calibration of the gauge. Measure the resistance of the these and see wether they come up to spec compared to the coloured bands printed on them, if not go down to jaycar and buy some replacements and solder them in, usually costs about a dollar to recondition a gauge Will try and chase down a basic diagram, remember these are very simple machines |
How do you know it is inaccurate??? What are your symptoms? Many old and new cars are inaccurate, i.e. reads full for the first half a tank before the
gauge moves.
Dave
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As Ragged says, what's your gauge doing that makes you say its not accurate?
Mine used to only go to 3/4 when full and tank was bone dry half way through reserve, another sender and it still behaved exactly the same.
I ran a new ground to the sender and it now goes all the way to full and at the start of reserve I still have 5L left which is spot on.
Moral to the story, check the sender ground.
^^ yep, also the voltage stabilizer earth can effect the readings. what exactly is it doing?
Straight after I will up it will stay at 3/4 for the majority of the tank, then it will jump down to 1/4 and hang about there, the last quarter seems to be accurate, I have replaced th sender unit but that didnt solve the problem