Low Fuel level Light

[tetlow]

Due to having a V8 in my MGB with a tiny stainless tank I need a light to say "Go to the Fuel Station".

I appreciate it will light 2 minutes after I leave the garage but that's not the point!

Are there any clever bods out there with a circuit to monitor the fuel gauge input and indicate when the level reaches a certain point?

Regards

Dave

[Chorlton]

Due to having a V8 in my MGB with a tiny stainless tank I need a light to say "Go to the Fuel Station".
I appreciate it will light 2 minutes after I leave the garage but that's not the point!
Are there any clever bods out there with a circuit to monitor the fuel gauge input and indicate when the level reaches a certain point?
Regards
Dave

The Tank sensor I put in my Kitcar had several contacts on the top and one was for 'Low fuel level warning light'
Got it from Europa Specialist Spares.

[Eliot]

Here's a fully calibrated fuel gauge i made, you could just duplicate one circuit to achieve what you want:
http://www.mez.co.uk/ms13.html

this chap made a 4 LED version of the same thing:
http://www.mevrocket.talktalk.net/Petrol%20Tank.htm

All a comparitor does, is compare the input voltage against a reference voltage - if they are the same the led comes on. So i have 8 adjustable reference voltages via the 8 mutli turn pots, you calibrate each one to a known amount of fuel. In my case, each led is 2 gallons.

[tetlow]

Cheers Eliot

That's exactly what i am looking for.

Regards

Dave

[tetlow]

Just tested the circuit.

Works a treat. I reversed the inputs so it now is not a fuel gauge.

It will flash when the fuel sloshes around but this will be a bonus as a flashing light is easier to see than a static one.

Thanks Eliot.

Dave

[Eliot]

Good-o.
Glad it worked - simple but effective. £10 says you build the full 8 led version!