ultrasonic fuel sending unit replacement

[liv2ryde100]

07 40 dancer. diesel. my sending units are not working properly. i have the ultrasonic units. i have read on here that some people have replaced with kus systems fuel sending units that actually install in the tank. i was wondering if that replacement would work with vesselview and the original fuel gauges. thanks

 

[ttmott]

07 40 dancer. diesel. my sending units are not working properly. i have the ultrasonic units. i have read on here that some people have replaced with kus systems fuel sending units that actually install in the tank. i was wondering if that replacement would work with vesselview and the original fuel gauges. thanks

The KUS sensors are reed style and provide a negative bias just like a standard float sensor.
Are you sure they are ultrasonic style? Smartcraft has dedicated wire harness interfaces on the starboard engine extension harness for standard 240-30 ohm (like the KUS) fuel level instruments. That black Motorola box mounted on the engine provides the Analog to Digital conversion.

If your boat has been converted to ultrasonic sensers then they would interface with a NMEA 2000 network and not Smartcraft. Doubtful your OEM fuel gauges would work if this is the case.

2007 I'm pretty sure used SysLink gauges with are digital driven from the Vessel View or SC display.

 

[liv2ryde100]

This is the sender, I unscrewed it, it doesn’t have anything that goes down in the tank. After hours of digging and phone calls, it was made by ssi technologies. I’m trying to find a way to buy them now. The company doesn’t sell directly to consumers. There’s a chance I still go the Kus industries way.

 

[ttmott]

That looks to be a SSI Fluid-Trac level sensor. It is ultrasonic. It appears to be 240-30 ohm emulated output.
The Pink wire is the output, purple is B+ and Black B-.
The issue you have if it needs replacement is the calibration for the tank depth on the boat. It appears that in this case Marine Max may be one of the few options to get a replacement.

 

[liv2ryde100]

That looks to be a SSI Fluid-Trac level sensor. It is ultrasonic. It appears to be 240-30 ohm emulated output.
The Pink wire is the output, purple is B+ and Black B-.
The issue you have if it needs replacement is the calibration for the tank depth on the boat. It appears that in this case Marine Max may be one of the few options to get a replacement.

If I go with the kus replacement which has a black wire and a red wire only, how do I wire it?

 

[ttmott]

I have the KUS SSS/SSL senders on my boat but my boat originally had the standard 240-30 ohm resistive float senders. The black wire gets grounded on the fuel tank with the existing black wire in the harness and the red goes to the engine extension harness connector which would be the Pink wire in the existing harness at the fuel tank.
What we don't know if is what your System Integration Module is configured for. I suspect it will be ok but not sure. The purple wire in the existing tank harness needs to be de-energized and folded/taped back into the harness.

As an edit - The Port fuel level wire should be Pink/Red and Starboard fuel level Pink/Green.
On the engines, look at the electrical connectors, they should be all labeled. "TANK 1" should be where those single wires connect on the engine extension harness; Tank 1 on the Port Engine and Tank 1 on the Starboard engine. If you can verify this your chances are good the KUS devices will work.
What we don't know is where the purple wires get their power. These need to be tracked down and power removed from them.

 

[liv2ryde100]

I have the KUS SSS/SSL senders on my boat but my boat originally had the standard 240-30 ohm resistive float senders. The black wire gets grounded on the fuel tank with the existing black wire in the harness and the red goes to the engine extension harness connector which would be the Pink wire in the existing harness at the fuel tank.
What we don't know if is what your System Integration Module is configured for. I suspect it will be ok but not sure. The purple wire in the existing tank harness needs to be de-energized and folded/taped back into the harness.

As an edit - The Port fuel level wire should be Pink/Red and Starboard fuel level Pink/Green.
On the engines, look at the electrical connectors, they should be all labeled. "TANK 1" should be where those single wires connect on the engine extension harness; Tank 1 on the Port Engine and Tank 1 on the Starboard engine. If you can verify this your chances are good the KUS devices will work.
What we don't know is where the purple wires get their power. These need to be tracked down and power removed from them.

Ok thank you so much for the information, sounds like I may need your help on another topic also which is I don’t currently have a high water alarm wired. I have a monitor at the helm but nothing connected in bilge

 

[liv2ryde100]

i ordered and installed a 24" sender from kus industries, u can actually order it off of amazon. u need to order one that is an inch shorter than your fuel tank. also be careful wiring because the black wire on the sender is not the ground. the pink wire is, the black goes to the gauge. so u wire black to pink. if that makes sense.