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Fuel flow meter problem

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  • Fuel flow meter problem

    Hi, since ive bought the boat the flow meter sensor never really worked. It will show during 1 or 2 minutes after you start the engine and then will start droping till 0 and will stay there no matter time or any other factor.

    What can i do before replacing the sensor?

    Thanks

  • #2
    Re: Fuel flow meter problem

    Ensure the sensor is mounted vertically fo best response.

    Comment


    • #3
      Re: Fuel flow meter problem

      And the exit needs to be at the top too.
      1998 Wellcraft Eclipse 24 Cuddy
      Volvo Penta Duo-Prop 7.4L "LK"

      2006 Sun Tracker Party Barge 21
      Mercury 90 4-Stroke FI
      "Common sense is not very common"
      "Failing to prepare is preparing to fail." -- John Wooden

      Comment


      • #4
        Re: Fuel flow meter problem

        Its placed vertically and the flow is the correct direction

        The flow faces down, this should be the other way?

        Comment


        • #5
          Re: Fuel flow meter problem

          What flow sensor do you have?
          1998 Wellcraft Eclipse 24 Cuddy
          Volvo Penta Duo-Prop 7.4L "LK"

          2006 Sun Tracker Party Barge 21
          Mercury 90 4-Stroke FI
          "Common sense is not very common"
          "Failing to prepare is preparing to fail." -- John Wooden

          Comment


          • #6
            Re: Fuel flow meter problem

            Ive got this fishfinder with the optional flow sensor
            http://www.thegpsdepot.com/th4200sx_gps.htm
            http://www.twinsuns-online.com/brows...-Fuel-Kit.html

            The sensor is installed in the exact position as shown in the pic in the second url.

            Comment


            • #7
              Re: Fuel flow meter problem

              Sure looks like flow should be up.
              1998 Wellcraft Eclipse 24 Cuddy
              Volvo Penta Duo-Prop 7.4L "LK"

              2006 Sun Tracker Party Barge 21
              Mercury 90 4-Stroke FI
              "Common sense is not very common"
              "Failing to prepare is preparing to fail." -- John Wooden

              Comment


              • #8
                Re: Fuel flow meter problem

                Originally posted by bruceb58 View Post
                Sure looks like flow should be up.
                +1..
                ....

                Comment


                • #9
                  Re: Fuel flow meter problem

                  Didn't you notice the arrow on the side of the transducer?? It clearly shows flow is upward. A fuel filter is also required in line BEFORE the transducer and the transducer also needs to be isolated from shock and vibration. you cannot have it simply flopping around in the hold or bilge. The turbine wheel inside the transducer has extremely fine vanes and is easily damaged by debris passing through it. That is the same setup, although a different head unit as I have on my walleye boat.

                  Comment


                  • #10
                    Re: Fuel flow meter problem

                    The transducer is in vertical position, it has an arrow on its shell and its in the same direction as the fuel flow... That arrow faces down and so do the fuel line way. Its inatalled in between fuel filters. Instalation seems to be ok for all i can see

                    Ill try to get a real pic asap

                    Comment


                    • #11
                      1998 Wellcraft Eclipse 24 Cuddy
                      Volvo Penta Duo-Prop 7.4L "LK"

                      2006 Sun Tracker Party Barge 21
                      Mercury 90 4-Stroke FI
                      "Common sense is not very common"
                      "Failing to prepare is preparing to fail." -- John Wooden

                      Comment


                      • #12
                        Re: Fuel flow meter problem

                        There are two issues here:

                        1) The arrow indicates the direction of fuel flow through the transducer and you apparently have that correct. However,
                        2) Orient the transducer so that arrow and hence fuel flow, is upward - not downward. Another way to look at this is as Bruce pointed out earlier -- the exit port on the transducer must face upward.

                        You apparently have things only half-right.

                        Comment


                        • #13
                          Re: Fuel flow meter problem

                          yesterday i had some time to work on, finally weather has been imposible!

                          changed the direcction of the arrow, now faces up, and the flow also matches the way it should but im not gettin any reading.

                          this gauge is a piece of yunk finally, thanks to all who cared!

                          Comment


                          • #14
                            Re: Fuel flow meter problem

                            dont quit yet a flow meter can be a little quirky and i will try to explain why. the sensor is designed to read liquid flow it gets real confussed by air flow. when the sensor is installed the arrow has to point at the engine as thats the way the fuel is flowing but and this is a big but....... if the sensor is not orininted so the flow goes uphill then any air entrapped in the system will cause the sensor to miss read.

                            simply air is lighter than gas so all air bubbles will rush to the top of the pipe past the sensor. if the fuel was to flow downwards then it would wash bubbles down with it then the bubbles will accumulate and go back up the pipe confussing the sensor.

                            so if its installed correctly allow the engine to run for 5 mins to allow the air to get pushed to the engine then if it still doesnt work try to rebooting the navman as it may have locked up if it is seeing a signal that is out of range from the sensor.

                            you may have a bad sensor or a bad setting but its always worth testing before replacing

                            Comment


                            • #15
                              Sign up today
                              Re: Fuel flow meter problem

                              what i didnt do is restart the navman!

                              its getting so frustrating this device.. the speed wont show now and the wheel aint stuck! So its gettin a lill bulky and useless. cant read speed, gas and if it ever showed a fish id win the lottery!! only depth.. that the only real function i can get today!

                              Comment

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