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Old 11 August 2014, 15:07   #1
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fuel flow reads 0 - thoughts?

Hi,
i have a navman 5505 chart plotter on the boat i've just bought. The chartplotter shows fuel flow and estimates fuel remaining in the main tank. The fuel flow did seem to be working although not very accurately. It is now showing a reading of 0 litres/hr even when I'm travelling at 25 mph.

Any ideas what I can check to rectify this?
I had tried to calibrate the "fuel used" on the plotter so maybe I've not done this correctly. I can rectify that by doing a factory reset on the plotter.

I ran out of fuel from the main tank because the estimated usage was so far out. Could this have affected the fuel flow sensor? to be honest I don't know if the sensor is part of mercury 115 efi engine or maybe it's a separate sensor. Does the mercury 115 efi have a fuel flow sensor?

Any ideas appreciated.
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Old 11 August 2014, 15:56   #2
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Boat fuel flow consumption meters
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Old 14 August 2014, 04:35   #3
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Quote:
Originally Posted by sweenman1 View Post
Hi,
i have a navman 5505 chart plotter on the boat i've just bought. The chartplotter shows fuel flow and estimates fuel remaining in the main tank. The fuel flow did seem to be working although not very accurately. It is now showing a reading of 0 litres/hr even when I'm travelling at 25 mph.

Any ideas what I can check to rectify this?
I had tried to calibrate the "fuel used" on the plotter so maybe I've not done this correctly. I can rectify that by doing a factory reset on the plotter.

I ran out of fuel from the main tank because the estimated usage was so far out. Could this have affected the fuel flow sensor? to be honest I don't know if the sensor is part of mercury 115 efi engine or maybe it's a separate sensor. Does the mercury 115 efi have a fuel flow sensor?

Any ideas appreciated.
unless your engine/instruments are NMEA2000, I doubt that the fuel flow information is coming from the engine, more likely a separate in-line sensor, which are notoriously inaccurate. You need to find out how your system is configured before you can go any further with the fault finding.
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Old 14 August 2014, 12:57   #4
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Its possible that the impeller in the flow sensor is stuck, not a uncommon problem on those.
If it uses same sensor as 2100 model, check that the sensor is installed vertically and that the impeller moves. If not, try to get it moving and add little lubricant, this might cure the issue for a while.
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Old 14 August 2014, 13:13   #5
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Yeh I also get that feeling then when you float off the trailer and trim down the engine go to turn the key... and then you realise that the ignition key is still in the car


Oops!! wrong thread..Should be The Knot..... how did that happen
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