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Old 07-26-2017, 05:54 PM   #1
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Water Tank Gauge

2001 MS 390
Water gauge has crapped out. Tank 1 won't read at all. Tank 2 shows 1/4 full when tanks are actually 3/4 full. Not sure to check sending units (which appear to be glued in), or gauge unit?

Anyone with any wisdom on where to start?
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Old 07-26-2017, 06:49 PM   #2
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My 43 Mainship has the same gauge manufacture. Mine turned out to be the sending unit. I believe your sending unit is threaded in. It should just unscrew.
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Old 07-26-2017, 06:53 PM   #3
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Thanks for the reply. With the wiring on the sending unit it does not appear there is enough wire length to rotate to unscrew very far.
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Old 07-26-2017, 07:10 PM   #4
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That's usually the case. Before you cut any wires, See if it is threaded by trying to turn it. You may be able to cut some wire ties and get a little slack. They put in the sending unit then pulled wires to the gauge, never thinking that someone would need to change it
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Old 07-26-2017, 07:13 PM   #5
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This looks like yours. Liquid Sensors - Marine Diesel, Fuel, or Water Level Sensor
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Old 07-26-2017, 09:14 PM   #6
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Quote:
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Thanks, missing a link in your post?
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Old 07-27-2017, 12:12 PM   #7
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That's the way the link copied and pasted. It is highlighted, Just click it
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Old 07-27-2017, 02:02 PM   #8
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Quote:
Originally Posted by Vulcanbike View Post
2001 MS 390
Water gauge has crapped out. Tank 1 won't read at all. Tank 2 shows 1/4 full when tanks are actually 3/4 full. Not sure to check sending units (which appear to be glued in), or gauge unit?

The link vacser sent is likely the correct replacement unit; if not, the S5U might be. I think the only real difference is in the threads. In any case, my receipt for a replacement unit says S3U.

The unit you have is a prior product (I can tell from the year of your boat; ours was 2002 with the same older style sensors), since replaced with the newer stainless screw-in/out unit.

The new units are easier to attach to the tank; IIRC with the new mounting adapter ... probably the FL-2WE/FBR Mounting Adapter (from my receipts)... there's a shaped backing plate you can fit inside the tank, and then screw a top fitting to... and then the S3/S3U sensor screws into that.

The WEMA/KUS folks have been very helpful with details on what products to use, what lengths, mounting adapters, etc.

That said, each sensor will likely also have an inline fuse, probably 1-amp IIRC, somewhere in your system... so before replacing the sensors, you might want to just check fuses first.

As to calibration... it is what it is. Use some Mark I* Standard Eye Ball on the tank at various fill levels, make comparisons to what the gauges say at those known levels, work from there.

-Chris
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