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Random Quote: You can never over estimate a person's ability to disappoint
I'd like to install a fuel flow monitor in my twin engine 375HP each gas guzzling vacation station and I want to know if anyone had an opinion as to which would be more accurate. I am thinking of either the Flow Scan Twin Scan model or the Navman 3100. I was told that the Nav man uses a spinning gadget to sense fuel flow making it less accurate than the Flo Scan which uses a fume sensor. Any thoughts or opions would be appreciated.
I have the Navmanand the accuracy is phenomenal. In 2400 gallons of fuel, the cumulative error hs been 20 gallons (add all the errors, whetehr plus or minus and get the total). The absolute error has been less than 2 gallons (add all the plusses and subtract all the minuses).
Pricewise, you can pay almost $1000 for the Floscan 9000 or get more functionality with the Navman 3100 for about $400.
Not when I bought mine. They now offer a diesel model, so that may have changed. Best bet is to look on http://www.navman.com. The diesel transducer has positive displacement measurement (measures amount and subtracts amount returned). If it is gasoline safe, it should work with an EFI motor with return.
Have had the Navman...read through their chartplotter for one year. It has been great, but the sender and cable are mated as one piece and if the sender goes bad you will have to route a new cable with the new sender....I just snaked mine with a dummy string for when it happens. Greg
I just installed two floscans Can't say enough good stuff about them. If there only a little more money or even a bit more go with floscan!! Not saying the other is bad but man these are good and so are the people at floscan.
Lastly though purchase the unit through some-other-website.com GREAT PRICES!!!!!
I never heard of a fume sensor, but that doesn't mean it doesn't exist. I had FloScans years ago and they had a spinning turbine type sensor. Saphire as I recall. They were very accurate and trouble free. I have a Standard Horizon 240 with twins, which I believe is identical to Navman, and one ducer went out after a year of light use.
The FLoScans I have experience with use spinners. And they clog. Ask Capt. Don to the main board.
They also break, and it cost him as much to replace the sensor as the entire NEW NavMan costs.
FloScan was on the market first and are the most costly... However, this ain't rocket science.
If the price difference is what was quoted earlier, I would go with the NavMan.
The fuel meters in the digital instrument cluster that came with my Yahama four strokes are just as accurate as my
fishing buddy's FloScan, so FloScan does not have any silver bullet technology available only to them.
Not when I bought mine. They now offer a diesel model, so that may have changed. Best bet is to look on http://www.navman.com. The diesel transducer has positive displacement measurement (measures amount and subtracts amount returned). If it is gasoline safe, it should work with an EFI motor with return.
Harry
Thanks Harry,
I looked into the floscan for twin diesels and I think it was going to run me over $2k. I'll check out the Navmans.
I just hooked up floscans fot twin diesels the 620-bos-2k ( i think) I got them from boat fix dot com they were $1100 for the pair.
Thanks for the info. I went back to floscan's website because the $2,000 did sound like a lot. I was wrong, the 9000 series list for $1980 apiece, factory direct at $1485. I was actually looking at $3,000 plus my time for install!!
Flo Scan Verses Navman 
