Hunter 41 fuel gauge doesn't calibrate

[samjlord]

I have a 2004 Hunter 41 with a "Hunter" branded gauge, which I think is an Ultra-8 manufactured by Snake River? The only buttons on it are a "C" and up and down arrows (like the schematic attached). I was able to get it in calibration mode by holding "C" while powering on. I go through the steps to calibrate an empty fuel tank, but it doesn't change any of the values and the tank still reads 3/4 full.

Any pointers on how to reset the gauge? I attached an image of the float sending unit. Are the LEDs supposed to be lit up when the gauge is on? I didn't see either LED turn on. Can I replace just the float or would I need to replace the entire system?

Sam

 

[ice breaker]

My sender quit working at year 5. I replaced it with a wema tank sender and a round faria( Spelling?) gauge. It already had a round gauge for the 2nd tank. Still working 15 years later. I like being able to see the fuel level at a glance, rather than having to turn on the tank monitor. If you choose to replace the tank sender, I belive that the ohms are different for the snake river solution, compared to the industry standard.

 

[buddy0]

Sounds like you figured out how to calibrate. But here are the instructions for reference, and the manual.

I corresponded with the engineer that designed those while back and he gave me instructions on how to add a resister and use a traditional 0-180 ohm fuel sender.
Basically it was to bridge the SEN and PWR with a 510 ohm resistor and connect the SEN to the new sending unit.
His name is David T. Davis <dtdavis@dhmicro.com>

I did that and it worked perfectly.

 

[samjlord]

I've been in communication with Tech-Edge Manufacturing, who is giving me pointers on how to calibrate the sending unit directly. (It has to do with using a jumper between the black, white, and gray wires from the sending unit.)