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Old 04-27-2004, 01:25 PM
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Default Navman 2100 Fuel Flow Meter

I had my boat inspected by the Coast Guard this weekend, and through conversation, the inspector got me thinking about getting a fuel flow meter. I did some initial research and found there are two basic types of fuel meters - models that take GPS input and others that do not. Due to the much higher cost of the GPS models, I am mainly interested in the non-GPS models.

Specifically, I would like more information on the Navman 2100. This meter provides GPH and total gallons used information. By looking at the specs, I can see that this model should work well with my Yamaha 115hp 4-stroke. Other than this basic information, can someone give me some real-world perspective of this fuel meter? How accurate is it? Is it easy to install? Is a fuel meter a useful tool, or just another gadget? Are there alternatives (other makes/models) to the Navman 2100 that I should consider? Any recommends for an online vendor?

Thanks for your input.
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Old 04-27-2004, 01:52 PM
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Default RE: Navman 2100 Fuel Flow Meter

Handiest tool on my boat. Inexpensive and easy for a DIY. The 2100 will work for you as long as you do not have a fuel return line back to the tank. Some 4 strokes and HPDI 2 strokes have them.
I installed mine in a very short amount of time. The hardest part was pulling the transducer wire.
Drop me an email if you have specific questions.
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Old 04-27-2004, 02:01 PM
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Default RE: Navman 2100 Fuel Flow Meter

Your okay, there is no return line on the F115. It is very easy to install and pretty accurate. You will need to put the sender down stream of the fuel water seperator. If you don't have a fuel water separator/filter you will have to install one. The sender has to be in the upright position. I highly recommend you buy ss hose clamps rather than use the plastic ones that come with it. You will also have to put the display unit on a switch since there is no on off switch on the unit. The only down side to the unit is it has no GPS interface, for that you will have to calculate MPG in your head! The other part I like about it is it uses the standard 2.25 inch hole as opposed to Flow Scan and the Yamaha. It blends in nicely with the fuel guage and takes up less room.
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Old 04-27-2004, 02:13 PM
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Default RE: Navman 2100 Fuel Flow Meter

I just bought one of these last week. Haven't installed it yet tho.
Mine came with SS hose clamps. Maybe Navman finally smartened up.
I plan on wiring it to the ignition so that it turns on/off with the ignition key.
And, yes, running the transducer cable will be the hardest part of the install. (psychologically, the hardest part is cutting the fuel line!)
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Old 04-27-2004, 02:17 PM
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Default RE: Navman 2100 Fuel Flow Meter

One thing they are extremely useful for: another way to determine how much fuel remains in the tanks. Given the reliability of some of the gas guages on boats, this could prove extremely useful.
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Old 04-27-2004, 02:18 PM
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Default RE: Navman 2100 Fuel Flow Meter

get the F3100; it has gps interface for just a few bux more
$275 online at byownergroup.com
he also carries the F2100

installation is very easy; i did it myself with some help from THT
you'll need a 2" round hole in your console
the gauge goes in that hole; connect red to ignition & black to ground

you'll cut your fuel line after your water separator and install the fuel transducer
secure the transducer vertically, run the transducer cable back to the console, connect to the back of the gauge and you're done

BEST upgrade i've ever done to the boat

the gps interface gives you gps speed (which gives you mpg & estimated range remaining), plus gives you a speedo...i removed my inaccurate speedo gauge & used that hole for the navman

it is very accurate (with a half-gallon usually) and takes the guess work out of your fuel system. it's best feature is that it quickly helps you find your most economical cruise speed/rpm
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Old 04-27-2004, 02:43 PM
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Default RE: Navman 2100 Fuel Flow Meter

Quote:
Dan in Alaska asked:

Any recommends for an online vendor?
http://www.byownerelectronics.com/st...tomer/home.php
I bought a Navman 2100 from YachtJim a couple of weeks ago.
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Old 04-27-2004, 02:54 PM
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Default RE: Navman 2100 Fuel Flow Meter

I'm getting the 3100 installed with my new boat and I will interface it with my Furuno 1850W. From what manual indicates, this thing should be a great source of all fuel consumption and other fuel information. Can't wait to use it. My dealer is installing it along with my entire electronics package. I'm sure my entire electronics installation will be flawless considering that they do turnkey installs for lot of SKA folks and just normal offshore junkies like me as well. Can't wait to see how this baby keeps track of my fuel. Thanks all for the great comments even though it was not my thread ;}
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Old 04-27-2004, 03:45 PM
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Default RE: Navman 2100 Fuel Flow Meter

Wish they had the 3100 before I bought the Standard F41
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Old 04-27-2004, 03:50 PM
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Default RE: Navman 2100 Fuel Flow Meter

Quote:
Reel Pursuit - 4/27/2004 2:13 PM I just bought one of these last week. Haven't installed it yet tho. Mine came with SS hose clamps. Maybe Navman finally smartened up.
Actually from what I've read, the plastic clamps replaced the S/S one due to the S/S leaking air and giving inaccurate readings. I belive it was in a thread here in THT.

*EDIT* OOps I got it wrong.* They are having problems with the plastic clamps. THT thread
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Old 04-27-2004, 03:58 PM
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Default RE: Navman 2100 Fuel Flow Meter

I bought mine 2 months ago, came with SS clamps .

Cheers... Tyee.
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Old 04-27-2004, 04:07 PM
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Default RE: Navman 2100 Fuel Flow Meter

so what's the best way to go on this:
the cheap plastic clamps or the ss clamps that leak air?
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Old 04-27-2004, 04:16 PM
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Default RE: Navman 2100 Fuel Flow Meter

Dan, if I had to do it again I would buy the GPS interface, the simpler version is fine if you want to use it as a more accurate fuel gauge but if you want to use it to fine tune your most fuel efficient running speed under different conditions the GPS inerface is the way to go. Otherwise you are faced with placing a calculator on your console and keying in numbers which is not very practical.
PJB
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Old 04-27-2004, 04:23 PM
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Default RE: Navman 2100 Fuel Flow Meter

Here is where I first heard that metal clamps were a no-no...
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Old 04-27-2004, 04:29 PM
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Default RE: Navman 2100 Fuel Flow Meter

I have one and it worked beautifully until I upgraded my fuel water sep. As mentioned above, I have my transducer mounted vertically; however, I cannot get it to respond anymore. The fuel flow goes tank>>fuel/water sep>>transducer>>priming bulb>>engine. I think that the problem is due to air bubbles in the line but I can't seem to clear them. The fuel tank is the lowest point.... then the fuel/water sep above that.....the transducer is above the fuel/water sep....but the priming bulb is below the transducer. Could there be an air bubble that is caught at the high point in the fuel line (where the transducer is) that cannot be cleared? Any advice is appreciated as I loved having the unit....Thanks

Alex
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Old 04-27-2004, 06:06 PM
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Default RE: Navman 2100 Fuel Flow Meter

Dan,

I would suggest buying a Navman 5100 mono GPS unit (they can be had for around $320) and add a transducer (another $75.00) For a little more than $100.00 more than the 3100, you have a fine WAAS enabled GPS unit. I use mine as a backup to my main GPS. Works great by the way, and calculates not only GPH, Gallons used, Gallons left but also MPG and Range.
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Old 04-27-2004, 07:21 PM
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Default RE: Navman 2100 Fuel Flow Meter

Alex

Do you get a flow reading when you pump the fuel bulb, with the guage powered up, engine off?

Tyee.
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Old 04-27-2004, 08:57 PM
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Default RE: Navman 2100 Fuel Flow Meter

Ok, I'm not scared to show my ignorance. What's the transducer? Is it mounted on the fuel tank to shoot sonar and tell depth of fuel, then calculate? Could I get a second Garmin 240 blue transducer? If properly mounted, the little spinny wheel could tell fuel velocity
No really - What's the tranducer and where is it mounted?
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Old 04-28-2004, 12:17 AM
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Default RE: Navman 2100 Fuel Flow Meter

baypro21,

A fuel transducer is simply a device that reports fuel flow back to the computer/guage. The Navman transducer is a plastic housing containing a paddle wheel, for lack of a better term. A sensor in the transducer counts the revolutions of the wheel, sends the data to the computer which calculates volume per time unit or flow rate. It is mounted by cutting the fuel line between the tank and the primer bulb and installing the transducer. You have to pull a wire from the transducer to your computer/guage. Also recommended to install a fuel filter before the transducer. I think this is a fair explanation, maybe someone more knowledgeable will chime in.
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Old 04-28-2004, 02:22 AM
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Default RE: Navman 2100 Fuel Flow Meter

I second the comment about the plastic clamps going bad. I installed my navman abut 6 months ago. I just replaced my fuel pump and noticed that 3 of the plastic clamps had snapped off. One hose had no clamps on it at all. I hate to think what would have happened if the hose started spraying fuel in the engine while we were running. I put stainles clamps on and doubled them up for security. The plastic clamps are bad news. The heat makes them brittle. The navman itself is great though. It gives you peace of mind when you know exactly how much gas you have left. My regular fuel gauge says I'm empty when I have 20 gallons left.
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