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urgent help re LMF400

Old 10-21-2006, 06:07 AM
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Default urgent help re LMF400

After a few issue I am running the LMF400 option with a separator LGC200.

Thing is when in fuel flow mode the unit shows strange readings like (fuel flow 856. gph) and at that rate I am 56gal per mile ;? I can actually watch the fuel level go from full (40 gal) to empty in a few minutes.

Any ideas what the hell is happening, I have calibrated, re-sync everything, restored all values etc etc.

Here is the set up/

LMF400 dash mounted
LGC2000 antenna
Fuel flow sensor
Yamaha 100 4 stroke
40gal tank full at the moment.

The only thing I can think of is that I have mounted the fuel flow sensor to close to the water separator. The set up is fuel tank, separator, ep10 sensor, primer ball then engine. The sensor is mounted approximately 10 inches after the water/fuel separator.


Please help.
Old 10-21-2006, 07:59 AM
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Default Re: urgent help re LMF400

i would definately change the ep10 and see what happens.
Old 10-21-2006, 09:57 AM
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Default Re: urgent help re LMF400

I have to agree with Larry. Top of my short list of "things that could go wrong" would be the EP10. Too close to the separator isn't a factor. Mine is within inches of the separator.

Good luck

Don
Old 10-21-2006, 10:31 AM
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Default Re: urgent help re LMF400

Thanks guy's even though its brand new, like it would be lucky if I have run 5 galons through it.
Old 10-21-2006, 10:53 AM
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Default Re: urgent help re LMF400

Don't know if this is valid with the 400, but in my 111 the display requires a power connection and the LGC 2000 requires a second power connection. Having said that, the 10 should display even if the 2000 is not powered.

All I could suggest is to very carefully check your power connections and your network set up. If all is well there it almost has to be the 10. A call to Lowrance technical support may offer alternatives.

Let us know the outcome. I'm planning on installing a 10 shortly.
Old 10-21-2006, 11:21 AM
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Default Re: urgent help re LMF400

Thanks Butch, I have to run the LMF400 as a second unit my sonar LCX19C is not compatible. The LMF is being used with the LGC2000 antenna and is powered. I know I have the connections right I am just getting strange readings. If the unit was not set up correctly then I would either not have power, or the GPS signal would not lock on. I think sneaks and Larry could be right.
Old 10-22-2006, 12:26 PM
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Default Re: urgent help re LMF400

How is you network bus set up?

Do you have 1 X EP10, 1 X LMF400, 1 X LGC2000 all dropping off 'T's with 2 X 120ohm terminators at each end?

Do you have only 1 power supply via the LGC NMEA power lead? How does the LCX16 feature? Are you sharing the GPS feed somehow?

TT

Old 10-23-2006, 06:37 AM
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Default Re: urgent help re LMF400

Thanks Tom networks as follows.

Terminator end EP10 to a T via bus cable, LMF400 to a T via bus cable, LGC2000 to a T and a terminator. Power is supplied via the Lowrance net power cable.

My sonar LCX19c is completely independent of the above system and uses the LGC12 antenna.
Old 10-23-2006, 08:31 AM
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Default Re: urgent help re LMF400

Well I will be a monkeys uncle or a horse A$$, no matter how many times I checked the connections they were right until tonight that is when I checked it again with open eyes and you would not guess it I have the bloody connections wrong .


Anyways she works a charm and at Idle the fuel flow was around 1.5- 2 liters per hour.

Thanks to all who offered suggestions, Thanks Toms for making me search for devices.
Old 10-23-2006, 03:05 PM
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Default Re: urgent help re LMF400

Good stuff, Rob.

Glad to be of help!

Don't forget to use the re-calibrate option for the next 3 times you fill up. Enter the amount of fuel required to fill the tank and then the select 'fill tank' and re-calibrate.

Keep an eye on the 'k' value anything above 0.2 requires re-calibration.

Cheers

TT
Old 10-24-2006, 07:02 AM
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Default Re: urgent help re LMF400

Will do mate thanks again.
Old 10-24-2006, 09:49 AM
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Default Re: urgent help re LMF400

IRT calibaration; for fuel remaining it's important for sure. But, as far as learning most economical cruise speed or perhaps RPM ranges to avoid I'd think calibration would be less essential. Relative fuel burn is what really matters, no? We just need to know at what RPM we burn more or less fuel for the speed acheived.

We can't do much about the fuel burn of our engines except to regulate our speed/RPM, trim, prop, and weight.

Question: Is the calculated MPG based on GPS speed over the ground or log indicated speed over the water? Over the water, I hope!
Old 10-24-2006, 10:03 AM
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Default Re: urgent help re LMF400

butch, i think the mpg is based off the parameter you set in the boat setup--usually SOG. SOW, from your paddlewheel would be imeasurably inaccurate, with wind, wave and current considerations. maybe i dont understand your question.
Old 10-24-2006, 04:14 PM
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Default Re: urgent help re LMF400

I think you have two options assuming that a paddlewheel and LGC2000 (or internal) are on the network.

Its something like this ECON:GRD & ECON:WTR meaning fuel economy based on ground and water speed. They're both in there you've just got to select the one you prefer.

TT
Old 10-25-2006, 10:37 AM
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Default Re: urgent help re LMF400

Great stuff. I think I'd prefer the SOW numbers as they would be unaffected by tide or current. Fifty MPH SOW should give about the same fuel burn upstream or down, no?
Old 10-25-2006, 11:07 AM
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Default RE: urgent help re LMF400

i dunno. personal preference i guess. i dont know anyone who counts on paddlewheel or pitot speeds for economy calculations. paddlewheels can spin freely or be sticky? when hold'up over my wreck, a 4kt current makes the paddle wheel think im still moving, and adding inaccuracy to my calcs. equally, my 'ride' up and down waves over the course of a day can make my calcs way off. but satalite driven speed and distance algorythms should be pretty close. just my idle minded opinion, you understand. pretty sure your routes and tracks are calculated with SOG/COG from the GPS as well. ;?

tt, im glad you're on here (belated 'welcome'!). you seem to have a pretty good depth of knowledge about the lowrancenet stuff. far better for folks to get info from another source, rather than just my one sided views from 18 months of running the LMF system.

cheers.
drew

Old 10-26-2006, 05:52 AM
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Default Re: urgent help re LMF400

Drew

I'm a beginner really but I have been working on a couple of early systems which, even with all the teething issues have been very impressive. This new stuff will change everything just like when you first plugged your PC into a telephone socket!

I would like to pick up some direct contact with you over your experience with fuel management, in particular the most accurate way you have found to measure burn rates given the various options available. I'll have a look at your set up first on the website first.

Tom.
Old 10-28-2006, 10:25 AM
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Default Re: urgent help re LMF400

Ok you know what they say when its not broken don't try and fix it, man!!!!!!!!!!!!!!!!

So the fuel flow meter works perfectly at 4100 rpm doing 28mph I am near on 6 mpg, so far seems to be the best economy.

Now since fitting the fuel flow meter there has been 4 occasions where I have had rpm's dropping and feels like fuel is be starved to the motor, or what??????????? This never happened before as the Yamaha 100 4s has be flawless, never farted, missed coughed or anything in 282 hours. It was serviced around 10-20 hours ago..

Any ideas?
Old 10-28-2006, 07:34 PM
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Default Re: urgent help re LMF400

Your EP was installed vertically and downstream of the fuel filter, right? If upstream of the filter it could become restricted enough to cause trouble.
Old 10-29-2006, 05:29 AM
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Default Re: urgent help re LMF400

Defiantly after or downstream of the fuel filter, Its sort of mounted in a vertical position, but given its a T piece the vertical position can either be left to right (flow left to right or what I would call in-line) or north and south (Inlet north outlet south) which way is your EP10 mounted.

I guess the other question is,

Is your fuel line hose the same diameter as the sensor tube, my hose is a fraction smaller and took some effort to fit it to the sensor, could this effect the flow and cause starvation??


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