pointy
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| posted on 3/4/06 at 03:22 PM |
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fuel gauge reading
Gents,
Just bought a fuel sender from tiger and fitted but the vdo gauge i have only starts reading when the float arm is half way on the way up and the
gauge only reads 1/2 full when the lever is all the way up...i.e should be reading full..
any ideas.
thanks..
andy p
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Hellfire
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| posted on 3/4/06 at 03:28 PM |
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The gauge is not receiving the correct voltage regulated by the sender unit. Normally you need a matching pair to get a correct signal unless you
modify the sender to work correctly either by adding/removing resistance or altering the unit arm to generate more movment. The latter sounds like the
initial problem...
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pointy
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| posted on 3/4/06 at 04:12 PM |
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so its off to tiger for a fuel gauge........ooohhh poo
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pointy
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| posted on 3/4/06 at 04:12 PM |
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so its off to tiger for a fuel gauge.......unles anyone has an old one ????
[Edited on 3/4/06 by pointy]
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DIY Si
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| posted on 3/4/06 at 05:19 PM |
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Can you not just bend the arm on the sender to make it read right? Or does it run out of movement? If so, try just adding a resistor to the circuit.
This may make it read right with some experimentation.
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pointy
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| posted on 3/4/06 at 06:15 PM |
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Sounds cheaper but how do i do this as i dont want to bu..er up my new sender.
andy
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DIY Si
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| posted on 3/4/06 at 06:26 PM |
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It depends on which way round the sender works. Some increase in resistance as they fill up, some decrease. If it's the increasing type
you'll be ok. Just keep adding resistors until it reads right. If it's the other way round it's a bit harder to fix. I used to know,
but be bu**ered if I can remenber how to now. Sorry.
Either way get a mulitmeter on it and find out which way round it is. Just measure resistance at empty and full. Should make it fairly obvious that
way. If it goes up as it fills, try and get a reading just as the gauge moves off the stops and at the senders highest point in the tank. The
difference is the resistance you should need to add. Hope this helps. If I've remebered all that back to front I apolagise in advance.
[Edited on 3/4/06 by DIY Si]
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pointy
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| posted on 3/4/06 at 06:31 PM |
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Thanks very much,
Iwill give it a try this weekend.
andy
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02GF74
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| posted on 4/4/06 at 07:49 AM |
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like what DIY said. the guage needs to be matched to the sender.
It sounds like yours is doing the right thing but the sender is of too high resistance.
there are 4 options
a) take sender apart, uncoil wire and recoil it so there is about half the amount - it may become more non-linear
b) make a small circuit to up the voltage from sender to the guage (I did this to match defender guagers to Series senders - LR stuff)
c) get the matching guage for the sender
d) get the matching sender for the guage
the cheapest would be b).
a) would risk buggering the sender so you would then need to go route d)
You have wired 12 V to one side of the guage?
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pointy
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| posted on 4/4/06 at 11:56 AM |
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looks like option C as I have already bent the arm and drilled the holes to fit sender...so Anyone with a tiger gauge please contact...
andy p (more haste less speed.........)
[Edited on 4/4/06 by pointy]
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