WEMA - Diesel Tank Internal sensor

[sailcapt340]

I have to replace my diesel tank WEMA internal sensor. It‘s reading less than 1/2 a tank of fuel, when I can see I have just over 3/4 of a tank. It‘s not the most dire of issues, knowing the variation in readings I can guess at the fuel level, but would rather not have to.
I removed the sensor from the tank to clean it, but it’s not dirty or fouled. My guess is, it is saturated as it is free flowing out of the tank and gives me accurate readings when I move it by hand.
I also think it might be too short a sensing tube and I have just never noticed the variation before. And the only reason I did notice this issue was because I was in the compartment, saw the level in the tank and then when I looked at the gauge reading less than 1/2, I started to question what was happening.
Are Moeller Sensors more reliable and compatible with WEMA wiring and gauges?
Are there any other sensors being use currently that are better?

 

[dlochner]

Any float sensor is subject to absorbing fuel and becoming less bouyant, Wema (now Kuss) is one of the better ones. The Moeller floating arm sensors a bit more challenging to calibrate and have 2 issues, the float and the elbow with can become fouled and less responsive.

The most interesting sensors are the sonic sensors that Maretron and Blue Sea make among others. The Maretron out puts a N2K signal which can be read on MFD or instrument display.

The most contemporary sender out there is the Gobius C which is radar based. It provides both BlueTooth and N2K outputs. Pricey, but accurate. I have one on my black water tank.

Going old school is the Tank Tender. It relies on air pressure to read the tank level.

If you add a longer Kuss sensor, make sure you have enough vertical clearance to install it. If not you'll have to cut a new hole in the tank. Been there, done that.