Raymarine e120 classic. Total Fuel

[jrudge]

I have just installed the yaght devices box and hey presto all Engine info including fuel flow

There is a variable you can display called “Total fuel “ which logically would show how much fuel is on board.

The garmin stuff works by you telling it how much fuel is in the tanks and it then counts down.

I can find no where on the system ( or in the manual which devotes 3 pages to engine displays how you set this , or indeed a definition of what it is ( as it might not be fuel on board but I have no other ideas !)?

Anyone know !

 

[Whitelighter]

Is it not lifetime fuel burn
I.e the total fuel used since installation (or I guess last reset)

 

[andy59]

That looks interesting, will it display both engines at once on a single screen ?.

 

[[165042]]

Yes - from memory it supports three engines in total.

Total fuel is essentially a fuel gauge and requires NMEA2000 tank level information.

 

[MapisM]

Total fuel is essentially a fuel gauge and requires NMEA2000 tank level information.

Do you mean that this is the ONLY possible meaning of the field "Total fuel"?
I am wondering because if J can now see the real time fuel burn, he's obviously reading it from the engines ecus.
And afaik, most ecus store also the lifetime fuel burn, so maybe there's a way to "see" that number too...
Of course, what the ecus can't be aware of is the tank level, whose sensors I very much doubt that were NMEA2k on the Sq58.

 

[[165042]]

Total fuel is driven by a fluid level NMEA2000 sentence AFAIK - engine sentences support fuel rate etc.

 

[jrudge]

Called Raymarine support and they called back. Don’t know.

The chap who does will call me on Tuesday.

It could be total fuel consumed ever but frankly who cares about that other than a volvo engineer looking at engine life’s

I will report what they say !

 

[vas]

Total fuel is driven by a fluid level NMEA2000 sentence AFAIK - engine sentences support fuel rate etc.

having played with NMEA2000 sentences a lot, I DONT remember any sentence related to total fuel burn, tbh would be v. odd for an independent service of all sorts of data pushing back and forth to delve into that area...
So I'd agree that it must be just diesel fuel level based on your NMEA2K sender on the tanks (which 99.9% you don't have, but you can buy for a few hundred quid...)

cheers

V

 

[[165042]]

Raymarine UK support aren't what they used to be so it doesn't surprise me only a couple of people know.

The interfaces can obviously send any data sentences they want so could in theory interpret total fuel burn internally and supply this as a fluid level sentence. That would be highly unlikely though IMO.

 

[jrudge]

My assumption is that like garmin this is a calculated field not a sentence.

On garmin you set total fuel on board. Say 3000 lt. Then the fuel consumed comes off this figure hence you know the fuel on board

There are separate fuel level indications and these don’t work on mine as I won’t have the data on the engine bus.

 

[[165042]]

Do you mean a Garmin interface or a Garmin plotter? What interface have you got?

 

[vas]

My assumption is that like garmin this is a calculated field not a sentence.

On garmin you set total fuel on board. Say 3000 lt. Then the fuel consumed comes off this figure hence you know the fuel on board

There are separate fuel level indications and these don’t work on mine as I won’t have the data on the engine bus.

Jeremy,

the above don't quite make sense to me I'm afraid.

you have the configured tank size, OK
you have tank level indicators (if you do NMEA2000 ones), OK
you also have either fuel flow meters that do instant consumption, or a tool to pick something from the engine ECU. That is not clear yet what the ECU gives, but it must give instant consumption (FuelRate in litres/hour) as that seems to be the only thing supported by PGN127489 sentence. Couldn't find anything else but admittedly I don't have the full N2K standard to go through...

Then you have a fancy plotter.

What you get on the screens other than primary data is dubious.
I mean, yes you may get remaining fuel but out of what? surely tank size and N2K tank level indicator are the two sources.
Else (as in you don't have tank level monitors) you need to "inform" the system that you filled the tanks and then plotter carefully keeps track of fuel consumed since and presents the fuel remaining by deducting it from the full tank size. Wonder if they do bother with that, how accurate it will be and what liabilities they are against if a user inadvertently instructs the system that tanks are full when they are not and eventually runs out of fuel at the wrong time and place...

it's confusing, we need someone who has all that to explain how it works. I'm hopefully installing flow meters next week (more on that later) and haven't bothered to wire the pressure based diesel tank level metering yet, so cannot help.

cheers

V.

 

[jrudge]

I am using Raymarine.

The garmin ref is how garmin works. Tell it how much fuel you have and then it monitors consumption by counting down. It works well.

When you fill up you either tell it is is full or that you added say 1000 lt

 

[vas]

I am using Raymarine.

The garmin ref is how garmin works. Tell it how much fuel you have and then it monitors consumption by counting down. It works well.

When you fill up you either tell it is is full or that you added say 1000 lt

OK, fair enough,

cannot do that on a Garmin!

cheers

V.

 

[jrudge]

You can do it on a Garmin. That is what I am basing my experiance on

You MUSThave the engines on or the ability to add fuel etc is not shown can on the menu

 

[gobofraggle]

If the system is similar to the E127 or eS127 then the idea is you set the total fuel in boat set up, set the tank sizes etc. You have to remember to set the tanks to full every time you fill them... Then the MFD calculates the total fuel used from the fuel consumption data coming from the engine, grated that its an ECU controlled engine.

 

[jrudge]

I hope it is but if so where do you set fuel on board.

It is not in the manual., Raymarine don’t know and I can’t find it !

 

[[165042]]

That's not how it work on an E120 as I've previously said. They are driven by fluid level (%) NMEA2000 sentences. Your Raymarine interface will not provide this unless you have tank level sensors fitted.

 

[jrudge]

I believe the fuel level ( which I don’t have senders for ) is shown as fuel 1 and fuel 2

If total fuel was driven by the tanks ( which given gague accuracy seems a bad idea ) then there would still need to be a setting to tell it what 100% fuel was in litres I assume ?

 

[[165042]]

This should explain it:

http://forum.raymarine.com/showthread.php?tid=2543