Helios Users Guide
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Analog input
Installation
The fuel tank in passenger vehicles it is generally located under the back seats.
Typically, it has three or five wires:
1. Fuel pump wire – can be identified, when the engine is running, by
measuring 12 V on this cable.
2. Ground – 1 or 2 wires.
3. Fuel gauge (level) wire (analog) – can be identified by grounding
(connecting to the body of the vehicle) the analog wire. If the connection is
correct, the fuel level will rise to FULL (NOTE: In some vehicles the gage will
not rise at once, but gradually). When the engine is running, you can
measure 0 – 28 V depending on the fuel level. This voltage may vary between
different vehicles and requires calibration.
4. Fuel warning LED (digital) – Not present in all vehicles. When the fuel level
falls below a critical level, this wire lights a warning lamp on the dashboard.
Connecting your testing lamp to this wire also causes the warning lamp on
the dash board to light up.
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