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Fuel gauge started giving bad readings

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  • Fuel gauge started giving bad readings

    Hi all, I have a 2003 Bayliner 185 with 4.3L carb Mercruiser and Alpha 1 Gen 2 that I have owned for 4 years. The boat has been very reliable.
    The fuel gauge has always seemed decent.
    This season I had two incidents. Scenario #1: the gauge read a little below 1/2 and the engine began to sputter. I imagine it was picking up air intermittently. Made it back to the dock, fueled up and everything was great.
    Scenario #2: gauge was a little above 1/2 and it ran out completely. The readings seem to be getting worse.
    Boat was loaded exactly the same. Same people, same gear.
    Gauges are Faria.
    Any ideas? Gauge, sending unit?
    Thanks,
    Joe
    Last edited by poconojoe; September 25th, 2017, 03:03 PM.

  • #2
    Check for a solid 12V at the purple wire on the gauge. See if it increases to 14V with the motor running.

    Next ground the sender terminal on back of gauge at it should peg Full

    Next pull the sender, cover the hole then reattach wires to sender. Make a good ground connection from the tank to the sender. Turn key ON and raise and lower the sender watching the gauge.

    If it does not work, peg sender lead to ground to cause gauge to peg Full

    If it appears to be the send, use an ohm meter and measure the resistance with no wires attached. 240 Full and 33 Empty

    Edit this is backwards: 33 Full and 240 Empty
    Last edited by AllDodge; September 25th, 2017, 06:31 PM.
    94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
    95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
    07 SeaDoo GTX
    Raw Water Pump Maintenance
    Merc Adults Only
    G-Dad always said "First Liar doesn't stand a chance"

    Comment


    • #3
      Originally posted by AllDodge View Post
      Check for a solid 12V at the purple wire on the gauge. See if it increases to 14V with the motor running.

      Next ground the sender terminal on back of gauge at it should peg Full

      Next pull the sender, cover the hole then reattach wires to sender. Make a good ground connection from the tank to the sender. Turn key ON and raise and lower the sender watching the gauge.

      If it does not work, peg sender lead to ground to cause gauge to peg Full

      If it appears to be the send, use an ohm meter and measure the resistance with no wires attached. 240 Full and 33 Empty
      Wow! Great troubleshooting instructions! And the readings for resistance! That's awesome.
      Guess what I'll be doing this weekend!

      Comment


      • #4
        Woops, I did this backwards
        240 Full and 33 Empty
        Its 33 Full and 240 Empty
        94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
        95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
        07 SeaDoo GTX
        Raw Water Pump Maintenance
        Merc Adults Only
        G-Dad always said "First Liar doesn't stand a chance"

        Comment


        • #5
          Sign up today
          Originally posted by AllDodge View Post
          Woops, I did this backwards


          Its 33 Full and 240 Empty
          Got it!

          Comment

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