fuel guage reading

[ChrisG]

Hello - I have a question on my RT that is on my lift when I am taking a reading:
1. Which fuel guage is the correct one to use and rely on in my 2020 Ranger Tug R-29 - the main engine guage says i have 55 gallons - Yes ! but the one on my Garmin says 19?! No!
2. Why would they be different since I thought the engine computer is connected to the Garmin and gives it the same info?
3. I assume it doesn't matter for accuracy if it's on my lift vs floating in the water when I check the level?
Obviously I want/need to be sure!
Thx,
Chris Graae

 

[Jared Dunning]

The fuel gauge on the Volvo is more accurate than the Garmin. The two systems do not communicate directly with each other, but both can read from the same sending unit in the fuel tank. Depending on how the Garmin was originally set up, it may already be reading from that sender. I would trust the Volvo display first, since it is directly connected to the sending unit in the tank. The Garmin can also be configured to read from the sending unit, but personally, I would rely on the Volvo gauge.

 

[ChrisG]

The fuel gauge on the Volvo is more accurate than the Garmin. The two systems do not communicate directly with each other, but both can read from the same sending unit in the fuel tank. Depending on how the Garmin was originally set up, it may already be reading from that sender. I would trust the Volvo display first, since it is directly connected to the sending unit in the tank. The Garmin can also be configured to read from the sending unit, but personally, I would rely on the Volvo gauge.

 

[ChrisG]

Hi Jared - thank you. Agree on Volvo being the one to use. Now a new twist - I'm on the boat one day and the Volvo guage says 55 gallons. Two days later - without going anywhere in between - it lights up and says I have 40 gallons! Bad sending unit sensor? Never ends....
Thx