Fuel Gauge Voltage Range

[450Nick]

Hi all,

Does anyone know the corresponding voltages of an empty and full tank from the sender for a Chimaera/Griff? Also the total fuel tank capacity... Thanks

[magpies]

Found this from the Smiths Gauges web site:

a typical European standard would be 10 ohms at empty and 180 ohms at full for a fuel gauge/sender combination.


So you need to bend the operating arm to suit the position which gives those resistance readings which will be within the full range of sweep.

The gauge should read empty / full at 10 / 180 ohms

[450Nick]

Brilliant thank you!

[Penelope Stopit]

Credit where credit's due

Love him or loathe him

Sometimes posted much bks

Other times posted the dogs bks like the below info

There is no way the Chimp would have posted the following without having got his multimeter out and proven the figures to be correct

ChimpOnGas said:

The TVR petrol gauge works on a 250 - 0 Ohm range (0 Ohms full & 250 Ohms empty).

[Penelope Stopit]

Please accept my apologies for not posting sooner

[Englishman]

Depends which sender you have. Mine measured as 3 ohms empty, 190 ohms full. The tanks also vary in capacity

[Penelope Stopit]

Englishman said:

Depends which sender you have. Mine measured as 3 ohms empty, 190 ohms full. The tanks also vary in capacity

The above info posted by the Chimp was posted to the Chimaera forum

Am clueless about tank sizes

The Chimp did post the following to another topic

ChimpOnGas said:

The standard fuel tank is 12.5 gallons

What I'm saying is dont trust the TVR gauge, there are better and way more accurate ways to establish your true fuel economy and range, the one thing that doesn't change and can be relied upon on all Chimaeras is the 12.5 gallon tank capacity.

[Penelope Stopit]

This put a smile on my face

ribol said:

Anything that uses voltage in a TVR cannot be taken too seriously

[450Nick]

Yeah it sounds like there could be different senders. There are two standard ranges - 10-180 and 30-250, but the final adjustment can be made by bending the float.

I'm just designing the input circuitry for my new dash pod design and basically need a voltage divider to be able to read the sender. It seems if I use a voltage of 125ohms for R2 if the sender is R1, then I can get a good range regardless of which sender I have (don't have the car with me right now). The only thing I'm worried about is that if it truly goes to 0 ohm when full then I need to do something to prevent a short circuit with a series resistor.

[hoofa]

If you use a fuel wizard box you can match anything to a given output. There are better senders than the floats, I have just installed a larger fuel tank and use a vdo dip tube style sender, the fuel pump is now in the tank , tank capacity is 17 gallons

Edited by hoofa on Sunday 23 May 07:25

[Pupp]

Also went with a VDO dip tube sender, and really struggled to get it working sensibly with a SPA digital gauge… good luck!

[450Nick]

Hmm that sounds like a good idea... I think I may want a larger tank with my build and I believe the LT4 engine needs an in-tank pump too so this would make a lot of sense. Any idea what the resistance range of the dip tube is? I'm basically using a small Arduino to read the sensor so I can scale the output to whatever the tank size is in the software before I display it on the dash and with the digital gauge servo.

[Penelope Stopit]

These look good and are made of many different lengths, sky's the limit



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