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Fuel Level reads wrong?

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Kent Casual Dubber

35 posts · joined Feb 2013 ·

#953896
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 ?

bitemeoz Officially Full-On Dubber

355 posts · joined Oct 2003 ·

#953910
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.

matberry Moderator Go hard or go home

8,114 posts · joined Mar 2006 ·

#953911
there's a few different models, need more details
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE

nils Fahrvergnugen

971 posts · joined Jan 2008 ·

#953984
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
Quit calling rust patina

Kent Casual Dubber

35 posts · joined Feb 2013 ·

#954570
nils wrote: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
is there any way to test these resisters with out pulling out the gauge? I am horrible with electrical work !

ragged Just ask if you need HELP!

478 posts · joined Jan 2005 ·

#954628
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

nils Fahrvergnugen

971 posts · joined Jan 2008 ·

#954702
Kent wrote:
nils wrote: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 gamachines
is there any way to test these resisters with out pulling out the gauge? I am horrible with electrical work !
Afraid not kent 🥲
Quit calling rust patina

Joel Now containing 100\% E-Wang

9,368 posts · joined Feb 2006 ·

#954764
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.

matberry Moderator Go hard or go home

8,114 posts · joined Mar 2006 ·

#954791
^^ yep, also the voltage stabilizer earth can effect the readings. what exactly is it doing?
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE

Kent Casual Dubber

35 posts · joined Feb 2013 ·

#964817
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