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Compatibility Question About Gasoline Immersion

Discussion in 'General Electronics Discussion' started by BillV, Sep 18, 2012.

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  1. BillV


    Sep 18, 2012
    I'm replacing the swingarm type fuel level sensor in a motorcycle with a non-moving design. The existing sensor arm moves a wiper on a potentiometer which sits inside the tank and is immersed in gas about half of the time (it's level dependent). The potentiometer elements are exposed and attached to what appears to be a ceramic board. It will be replaced with two solid state level sensors and the associated drive circuitry, which consists of five transistors (TO92), two capacitors, and seven resistors, all mounted on a FR4 board. Everything, board/sensors/interconnecting leads, will sit inside the tank and be immersed just like the swingarm sensor. The total power to the board will be about 1 watt. I'd prefer metal can transistors but the transistors that I'm using are not available in that package. I've provided information about the swingarm sensor so that (hopefully) people won't think that this is an exercise in self immolation.

    Does anyone see any compatibility issues here? The sensors and their leads are made of compatible materials. I'm thinking of encapsulating the board, about 1"x2", with a clear epoxy but it's not apparent if this will make things any better or worse.

    It may be totally irrelevant but, FYI, the fuel pump also sits inside the tank and the motor is cooled by gas circulating over it.
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