tri
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| posted on 25/4/05 at 10:31 AM |
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more help needed
hi i know i asked this before but i am in need of more information on the working on a fuel sender and gauge unit. it does not need to be on one in
particulare just stuff on how they work
Tri
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nick205
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| posted on 25/4/05 at 11:15 AM |
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The sender usually has a float on a swinging arm, that rotates a potentiometer (variable resistor) as it moves. As the pot moves, it alters the
voltage at the gauge, which in turn moves the needle.
That's my simplified understanding of how they work 
Someone else may well know a lot more!!!
Nick
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Arnie
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| posted on 25/4/05 at 05:23 PM |
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thanks for that anyone else know the alot more bits lol
Tri
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wilkingj
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| posted on 25/4/05 at 06:30 PM |
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you need to know whether your gauge reads full with high or Low resistance from the sender, ie some are back front to th others.
Say the float range gives you 30 ohms empty and 300 ohms full, you need a gauge that goes the same way or it will read empty when its full and vice
versa.
Easy to test with a couple of resistors to test the gauge, it will tell yuou if its hi to low or vicy virky.
ie get a sender that matches the gauge. Same with any gauge that has an electrical signal eg Temp, or electric oil pressure (not capillary tube).
Have a trawl round the net, you will see the figure by the fuel senders etc.
it will give you an idea.
1. The point of a journey is not to arrive.
2. Never take life seriously. Nobody gets out alive anyway.
Best Regards
Geoff
http://www.v8viento.co.uk
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Northy
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| posted on 25/4/05 at 07:07 PM |
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If your guage doesn't match the sender can it be altered inside to make it work? 
Graham
Website under construction. Help greatfully received as I don't really know what I'm doing! 
"If a man says something in the woods and there are no women there, is he still wrong?"
Built 2L 8 Valve Vx Powered Avon
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JoelP
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| posted on 25/4/05 at 09:22 PM |
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the gauge usually has a bi metallic strip in it, coiled up into a spring. As the voltage heats it, the two metals expand at different rates and the
coil will uncoil slighty, hence the needle moves. This is all powered by the float and variable resistor as described above. Obviously the markings
are just added as required
Beware! Bourettes is binfectious.
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