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NavMan Fuel Management ???

Old 10-13-2006, 04:03 PM
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Default NavMan Fuel Management ???

Anybody used NavMan Digital Fuel Monitor (model AA004551R)
DEFENDER Marine ad ( Price $139 ) states only suitable for uses w/2 Stroke or 4 Stroke Carbureted engines. Will it work w/ Fuel Injected 2 stroke Evinrude ETEC
Could Not find any info on NavMan Web site regarding use .
Can it be used on 2 stroke fuel injected engines ;? :
Old 10-13-2006, 04:24 PM
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Default Re: NavMan Fuel Management ???

Works fine with my EFI Honda 225. You have to lengthen the sampling rate to get accurate low flow indications on EFI engines. Easy to do. Procedure is in the instructions.
Old 10-13-2006, 04:43 PM
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Default Re: NavMan Fuel Management ???

Yes, it will work fine.
Old 10-13-2006, 04:48 PM
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Default Re: NavMan Fuel Management ???

Maybe I need to lengthen the sampling rate because it always overestimates fuel usage even after I have tried to calibrate it.
Old 10-13-2006, 11:22 PM
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Default Re: NavMan Fuel Management ???

Mine works fine also, 1999 EFI 250hp Merc
Old 10-13-2006, 11:30 PM
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Default Re: NavMan Fuel Management ???

This is the Navman F 2100. I have owned 4--one each on previous boats, and two on the current boat. They have been quite satisfactory on both inboard injected engines and on injected outboards. They do not work well with an engine which has a fuel return line.

Also consider the Lowrance flow units. Remember the Navman 2100 does not give miles a gallon--you have to derive that. If it is important--I just do the math--look at flow rate, and at fuel used/remaining. The units do have to be calibrated, but that is quite easily done
Old 10-14-2006, 10:02 AM
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Default Re: NavMan Fuel Management ???

Before you get carried away, check out what your outboard manufacturer says is your target burn in gallons per hour at idle RPM, as some people in the forum have preivously gotten them and their burn at idle RPM wouldn't register enough fuel flow for the sensor to pick it up, so their total burn figures and estimated remaining numbers were offwere off. Navman specs something on their website, but my friends yamaha 175 didn't hit their target floor until something like 1,700 rpm.
Old 10-14-2006, 07:57 PM
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Default Re: NavMan Fuel Management ???

OK,call me stupid! Mine also over estimates my useage about 15- 20%. So how do you lengthen the sampling rate? Mine was allready on the boat.No instructions were included. Thanks in advance, Jeff
Old 10-15-2006, 08:51 AM
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Default Re: NavMan Fuel Management ???

There is a cal factor section in the manual so you can adjust up or down the burned amount, it is going to be a fixed +/- % (probably somewhere between 10-20%)though, not an unlimited tweak.
Old 10-15-2006, 06:52 PM
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Default Re: NavMan Fuel Management ???

SeaSwirler23, I do not have a manual.Would you mine posting the method for me. Thank you,Jeff
Old 10-15-2006, 08:28 PM
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Default Re: NavMan Fuel Management ???

bilfshr - Navman manuals are on their website.
Old 10-15-2006, 08:40 PM
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Default Re: NavMan Fuel Management ???

It should work fine. I run two Ficht 225s through a Navman F3100 which I believe uses the same senders as the F2100.
Old 10-19-2006, 12:51 AM
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Default Re: NavMan Fuel Management ???

There are two adjustments to improve the calibration of the NAVMAN fuel flow instruments:

--CAL.F: This parameter adjusts the fuel flow calibration.

--dAmP.F: This parameter adjust the time in seconds from 1 to 99 for the period over which the measured values will be averaged to help compensate for variations in flow rate due to waves and rocking motion on the vessel.

These adjustments are explained in section 3-4 FUEL CALIBRATION and section 3-5 FUEL FLOW DAMPING of the NAVMAN 3100 manual.

The manual also suggests that re-calibration is needed after the initial 100 hours due to some wearing-in of the moving parts.

Over the course of two boating seasons and about 1,000 gallons of fuel, I have seen an error of about 30-gallons, or about 3-percent. This was using the out-of-the-box calibration. I will try to re-calibrate next season.
Old 10-19-2006, 09:47 AM
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Default Re: NavMan Fuel Management ???

The LowranceNET system of EP-10's seems much more straight forward. As you add fuel there is a 're-calibrate' option which compares the actual fuel used (the amount added) with the calculated fuel used and the required adjustment is made. You also get full fuel management data such as MPG and range in conjunction with either GPS of paddlewheel distance.

TT
Old 10-19-2006, 10:15 AM
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Default Re: NavMan Fuel Management ???

I have a 2100 and I can't get it to an acceptable reading. When I first installed it, it was 10% low. It was consistent so I could have lived with that but I tried to make it better. After calibrating it on several occasions, it has not been that accurate since. With 70 to 80 gallon fill-ups it has been as much as 20% off. I am trying it once more. If this calibration is not back to at least the 10% I am going to try the lowrance.

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