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Big variations in flow indication on my fuel 3100

Hi there.
I have a navman fuel 3100 connected to my garmin gps. I have installed one, then two inline fuelfilters. I have bought a new prop( the part that connects to the fuelline), not once but twice. I have insulated the electrical wiring and installed everything according to instructions. I have callibrated the fuel.
BUT. It doesn`t work.
The first hour I had it, it seemed to work OK, but from then on it gives crazy indications. Before I insulated the electrical wiering it showed a fuel flow between 0.1 to 40 liters per hour (not very steady). After the insulation it shows a consumption of about 2 liters per hour, which in my case just cant be right either.
I have a Bayliner 2855 with a 7.5 L V8.
I have taken the instrument and all parts to the store where I bought it. They in turn have contacted other people who supposedly know about the navman. Neither could find anything wrong.
What on earth could be the problem ?????
Please help if you can.
Best Regards
Adrian Cirulis
Stockholm/Sweden

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  • 1 more comment 
  • adrian_cirul Dec 21, 2008

    Hi classyexpert.

    Ihave 2 brand new batteries

  • adrian_cirul Dec 21, 2008

    I have 2 brand new batteries, so that shouldnt be the problem.

  • adrian_cirul Dec 21, 2008

    Is it important in which ANGLE the Navman is applied in relation to the fuelpump?
    In my case the navman part is connected to the fuelline in a 90degree angle to the fuelpump, and then the fuelline itself is curved into the engine.

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Hi and welcome to FixYa,

To my understanding the sensor for the fuel flow would have to be connected right before the engine and after any filters. It might also be of help to double check the ground strap of the sensor, the Navman Fuel 3100 and the Garmin GPS. The ground strap is different from the negative power supply wire.

Good luck and Thank you for using FixYa. Happy Holidays.

Posted on Dec 22, 2008

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Try to empty the air from the fuel lines using a air compressor then try again.

Posted on Dec 21, 2008

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  • Expert
  • 327 Answers

Is the battery charged properly or may be it needs replacement. just click the link http://gpsinformation.org/dale/Palm/iQue3600.htm

Posted on Dec 21, 2008

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  • Fishing Boats Master
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Try eliminating the 'loop' in the fuel line between fuel filter and fuel pump, with flow meter fit in between

as suggested on this website, Navman fuel gauge help - TeamTalk


Navman fuel appears to give troubles of this kind most of the time.

Posted on Dec 21, 2008

  • Ginko
    Ginko Dec 21, 2008

    All you can check is there is no air in the fuel lines, as this is causing the erratic reading. Unfortunately with boat fluctuations, you always get air getting mixed with fuel. That is the reason why the problem is common to all Navman Fuel.

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