Holy smokin fuel pump relay!

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  • Pinball
    • Aug 2014
    • 12

    • Oregon USA/ SE Asia

    • 79 Marlin 305 Chevy 63 85 hp Mercury 2008 Nautique

    #1

    Holy smokin fuel pump relay!

    2008 Super Air Nautique 210 Team Edition
    Had some (lots) corrosion in the fuel pump relay socket, wired that pin independently, still heating it up though, significantly.
    Boat runs fine, yet, getting warning light and intense heat at the relay box and wires close to it, specific to the fuel pump(s). Have read here about how the pump motors wear, and then draw more amps, the weird thing is that it's just melting things and not blowing the fuse. Have heard these relay/ fuse boxes are prone to condensation/corrosion issues. Would like to try wiring the fuel pumps entirely independently of harness, but have feeling that may dork up or omit some computer input requirements and produce some other failure, as many engine management features seem interconnected. Have read elsewhere that corroded wires can cause this symptom, by inducing resistance, which produces heat. Thoughts suggestion? Would really not like to blow up or destroy, or just start replacing expensive fuel pumps, stabbing in the dark.
  • jkallen21
    Senior Member of PLANETNAUTIQUE
    • Jan 2013
    • 400

    • United States

    • 2006 Super Air 220

    #2
    Just curious where this relay is located in your 08?

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    • Pinball
      • Aug 2014
      • 12

      • Oregon USA/ SE Asia

      • 79 Marlin 305 Chevy 63 85 hp Mercury 2008 Nautique

      #3
      Hey there jkallen21

      There is a black plastic box ong he starboard side sitting atop the
      engine. It houses any number of relays and fuses. We went ahead and wired the fuel pumps
      direct to batt ( fused) and show no overheating wires etc.
      We highly expect that the relay box and the wires leading up to it are corroded, causing additional resistance which creates heat leading to our holysmokin fuel pump relays, wires and plastic relay box.

      The operative theory being that: The box sits on top of the engine just under the cover.
      The boat operates in hot an humid conditions. Condensation accumulates
      in the box and migrates down into the relay socket and wires coming up to the box.
      Last edited by Pinball; 08-26-2014, 12:17 AM.

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