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Old 02 August 2015, 18:50   #1
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Ribcraft 585 fuel guage / sender problem?

Hi, newbie so please excuse lack of knowledge.

Very pleased to have just acquired a 2005 Ribcraft 585, but I have a few niggles to iron out. The fuel gauge was replaced by the previous owner only a few months ago (needle type supplied by Ribcraft), but seems to read approx. half full regardless of how much fuel is in the tank (it drops to empty when power turned off). Given the gauge is new I am guessing either a wiring or sender problem. The sender (picture below) is in a relatively good place for access (in the binnacle), but it is not obvious to me if / how this can be taken apart. Any suggestions on how I could investigate resolve would be appreciated.


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Old 02 August 2015, 21:37   #2
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I had the same problem with my 1997 RC 5.85. Replaced the sender. Still wasn't 100% accurate but way better than it was. I now get accurate readings from my new smart gauge with the same sender.


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Old 02 August 2015, 22:20   #3
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I can't help with your problem I'm afraid but just to confirm, my own ribcraft fuel gauge and or tank doesn't read fuel well. I had to put a fuel flow on the engine to have any real idea of how much fuel i had left.

If I brim mine it will instantly go to half full as soon as you get moving. When you stop again the guage goes back to the real reading.

I don't know why exactly this happens but I guess it is a drawback with large flat under deck tanks???

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Old 03 August 2015, 04:26   #4
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If anyone with any old type Fuel Guage/sender says its at all accurate on a RIB ....they're deluding themselves.
If you want accurate fuel levels I'm afraid you'll have to go electronic, eg fuel flow meter,ect end of.
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Old 03 August 2015, 05:37   #5
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Or get a stick & dip it if you have access sometimes low tech works best
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Old 03 August 2015, 05:49   #6
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That's the trouble with RC tank you can't access from the top to many curves and tank is about 2/3 ft down from filler.


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Old 03 August 2015, 05:51   #7
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Thanks for the comments - I like the idea of stick and dip, but don't think my filler pipe is straight enough to make that possible (tricky on the go too). Long term, a fuel flow measuring device sounds like the way forward.

I guess the first thing for me to do is investigate if the sender is working. Could anyone tell me a) how does it come apart - looking at the picture above, does the top unscrew? b) is testing it as simple as manually moving something up and down once extracted?


Thanks for any guidance.
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Old 03 August 2015, 08:03   #8
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As others have said "traditional" fuel gauge is pretty inaccurate.

I calculate my fuel use by keeping a log of distance / trips and how much fuel it takes to top the tank back up to 90l (allowing for any interim replen by cans). I've found this to be pretty accurate and consistent, running at on average 0.85l / NM. I'd guess a 585 would be similar, or may be a tad thirstier.

When my fuel guage drops to 1/2 fuel i know I've about 35-40l left. I don't like to run with less than 1/3 of a tank in any case.
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Old 03 August 2015, 08:37   #9
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Fyi, my 6.8 with zuke 200 will sit at 0.9lpm at about the 3200-3400rpm mark.

I'm currently investigating the accuracy of the above but it isn't far off.

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Old 03 August 2015, 09:35   #10
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The manky looking aluminium bit should unscrew from the stainless stub. Take it out and there will probably be a float that slides up and down a shaft.
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