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Multi-Function gauge fuel level v. Garmin fuel level display

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  • Multi-Function gauge fuel level v. Garmin fuel level display

    OK -- I received delivery of my new boat and need some help with the gauges.
    Brand new Suzuki multi function gauges (Part 34200-96L2). Brand new Garmin 1242. Everything is supposed to be synced together and for the most part it is. My problem is with the fuel level being displayed on the Suzuki gauge.
    Boat Gas tank is 150 gallons
    Suzuki Gauge displays 1/4 of a tank.
    Garmin Fuel level displays 3/4 of a tank.
    I contacted the dealer, which is 500 miles away so taking the boat back for fix is out of the question, and they said they put in approx. 35 gallons of fuel.
    I had fuel delivered and they put in 92 gallons.
    So, 92 plus 35 is 127 gallons thus I tend to believe the fuel level on the Garmin is accurate since the tank is 150 gallons.

    So.... How do I get the Suzuki multi function gauge to display the correct level?

  • #2
    Tell it how many Gallons have been Added. I believe the Suzuki gauge works off of how much fuel is used and isn't actually reading the tank level. So tell it you you added 92 Gallons and it should match up. I believe that every time you add fuel or "Fill up" you will need to tell the gauge you did so. I could be wrong and your boat may have a nmea 2000 fuel level sender. Not sure on the specifics of your boat.

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    • #3
      The fuel level showing on the bar graph on the Suzuki SMG4 gauge is drawn from electrical connection to the tank sender unit. So in the same way as an analogue gauge gets an electrical signal from the tank sender unit (ohms) then so does the SMG4. As the ohms from the sender unit change as the fuel level changes, this makes the gauge change.

      If I recall correctly, there are 2 settings in the initial settings on the gauge for tank senders, because the Euro tank senders use different ohm settings to US.

      So I suggest having a look in the gauge menu, initial settings, and you should find fuel gauge settings there. If unsure, call the dealer and ask them whether this setting needs to be changed and how to do it.

      The other thing is that generally it is not possible to successfully run 2 x gauges from 1 tank sender unit. Ohms get messed up. So check that too.

      Garmins have their own internal fuel data memory, so the fuel level in the Garmin may be a calculated fuel level based on fuel burn data it gets from the Suzuki. So while it gets the burn data from the Suzuki, the x gallons it says were burnt and are remaining are calculations done in the Garmin. You will find that if you reset fuel used to zero in the Suzuki, fuel used wont change in the Garmin and it has to be reset separately.

      The reply from the previous poster is not correct. SMG4 does not work like C-10 and its gauge is indeed reading signals from the tank sender unit. You cannot tell SMG4 that x gallons were added, as you no doubt are aware, the only thing you can do when refuelling is reset fuel used to zero.

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      • #4
        The post by Rob is incorrect. The SMG4 gauge you have doesnt work that way. Unfortunately this forum has marked my complete reply posted earlier as possible spam for some reason so it will take a day or two to be fixed. Wait till its up.

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        • #5
          Originally posted by Moonlighter View Post
          The post by Rob is incorrect. The SMG4 gauge you have doesnt work that way. Unfortunately this forum has marked my complete reply posted earlier as possible spam for some reason so it will take a day or two to be fixed. Wait till its up.
          Thanks for Straightening things up, I was going off what I know or think I know. Clearly you are well in the know.

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          • #6
            Originally posted by Handsomerob1980 View Post

            Thanks for Straightening things up, I was going off what I know or think I know. Clearly you are well in the know.
            No worries, Rob

            Its easy to confuse the Suzuki C-10 digital gauge and the OeM Suzuki SMG4, they do look quite similar, but are in fact completely different in the way they operate, the way they connect to the engines, and how they manage fuel data and refuelling.

            Luckily Hogfish mentioned the part number of his gauges in his post so I knew he was talking about SMG4. They are relatively new to the USA being released there early 2019/20 if I recall correctly.

            Here is a link to a Aussie video released back in 2015 when SMG4 was first released to everywhere except the USA. Hope you enjoy.

            https://www.youtube.com/watch?v=YfaAR4P1Fgk

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