WEMA Water tank sensor - 2000 era

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Jun 4, 2004
834
Hunter 340 Forked River, NJ
I have the original and now defective WEMA water tank sensor on my 2000 H340. I could not find a suitable replacement match on the WEMA web site so I contacted them at info@wemausa.com. It turns out that the Hunter factory installed water tank sensor on my boat (marked 01-00, W2-17-H336) is a now discontinued model and has been replaced with the WEMA S3 series. This is a 0 to 180 ohms sensor and is 17 inches long. Curiously, the unit on my boat is a European, screw-in sensor which is mounted in a standard five-hole American style adapter ring. The gauge-compatible replacement for my boat is the European sensor # S3-432.
I had to deal directly with customer service at WEMA via email and phone and they were very helpful. As it turns out, you cannot purchase the new S3 sensors from the web site. The online sensors look the same but the ohms are different. The ones on the website are 240 ohms at empty and 33 at full. The replacement sender I need is 0 at empty and 180 at full. If you order online, you will need the entire system (gauge + sender) to make sure the units are compatible. I had to order my new sensor by phone directly from WEMA. Their contact number is on their web site.
I ordered a new sensor and will try to unscrew the old one from the mounting ring. It seems that Hunter sealed the threads with some unknown caulking and if I break the ring I will have to order a replacement.
 

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Dec 14, 2011
316
Navicula 430 Hunter Toronto
I just replaced my sending units and guage.... I bought everything here at the hunter store....everything matches and the price is right
 
May 28, 2009
764
Hunter 376 Pensacola, FL
I did our water tank sender this past winter. I ordered the WEMA stainless steel probe right off their website, along with the five hole threaded mounting adapter to replace the existing one. The original probe on our '95 336 was plastic, and it had apparantly broken off and dropped into the tank. Once I removed the old mounting flange, fished out the dead probe, and mounted up the new components and wired them in, everything worked just fine - I didn't need to replace the existing gauge. The 340 is just a 336 with an arch, so I'd be surprised if you didn't find that your existing gauge will work with a new probe.
 
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