Garmin GMI 20

Hi guys, I have a Garmin GMI 20 multi gauge on my boat connected by NMEA 2000 to my Honda 135.
The boat is brand new and only has 12 hours on it so far, but I have noticed the fuel level/ fuel remaining on board figures are out be a fair amount (at one point it said I had used 50L but when I topped it up I put in nearly 80L). The levels are configured correctly with tank size ect. Has anyone else had these issues? Is there an easy fix?
Cheers


mrwinta's picture

Posts: 448

Date Joined: 14/01/10

Same.

Sat, 2017-12-16 01:23

 Hey mate, I have them too networked with a Suzuki 175. Mine are also a bit out where after filling with 180 liters I will run out with 20-30L still showing.. I don't know how to recalibrate but I think it is more common than you would think.

I will follow this thread with interest.

 

Good luck

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 NEVER PUSH YOUR GRANNY WHEN SHE'S SHAVING

ranmar850's picture

Posts: 1532

Date Joined: 12/08/12

Thats a worry

Sat, 2017-12-16 07:54

 I had one of those Lowrance LMS fuel flows and gauge on a previous boat. 175L  with no gauge and gunwhale fill.  But it always overestimated fuel flow, no matter how often i recalibrated.  So i always had more in there, not less. After about 600 litres of use, when it was showing empty, you'd have 40 litres left in it. Used to empty completely and reset twice a year.

I would have thought that the 175 Suzuki would be reading fuel flow off the ECU, and calculating fuel remaining  from that, so would have been very accurate?  Have you tried searching THT on this? if it hasn't been discussed on there, it doesn't exist.

mrwinta's picture

Posts: 448

Date Joined: 14/01/10

GMI

Sat, 2017-12-16 08:35

 Its a job I have just never gotten round to.. I always make sure I have enough when I go out but yes you are probably correct the ECU is doing the clever bit.. I would think there would be a way of entering a correction facor into the GMI 20 to bring it more in line with real usage.

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 NEVER PUSH YOUR GRANNY WHEN SHE'S SHAVING

Posts: 17

Date Joined: 02/06/17

 I would be less concerned if

Sat, 2017-12-16 15:13

 I would be less concerned if it overestimated but as it is it's always on your mind. I always carry a lot more fuel than needed but it'd be nice if it was easier to monitor usage. It is calculated directly from ecu so you would believe it to be accurate but as stated it is a fair way off.