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Old 03-27-2013, 10:39 PM
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Snipe Snipe is offline
MC Devotee
Join Date: Nov 2012
Boat: 1998 ProStar 190
Location: Three Lakes,WI/summer;Menomonee Falls,WI/winter
Posts: 1,463
Originally Posted by Skipper View Post
If you took the sending unit out of the tank already then you can bench test it. Inside the tube is a float. On the bottom of the float are two small magnets. The float drifts over a circuit board. One wire on the ohm meter to each terminal on the sending unit. Then, tilt the sending unit to cause the float to slide down. The ohm meter reading should change as it passes each stage. If one or more of the magnets has fallen off the float then the numbers won't change as the float drifts across the circuit board.

In that case just disassemble the sending unit from the top. Fish out the magnet(s) and epoxy them back into place in the grooves on the float. Then, while it is out connect the ohm meter to the terminals and move the float over the circuit board. You should see the numbers change.

Put it all back together. Then test it again with the float inside the tube. It should still work as you tilt the tube upward and the float slides over the circuit board.

Someplace on this site is a thread I put together with pictures that shows how to do everything I just talked about. Maybe run a search with the key words sending and unit.
I did see that post on here. I have the 1/2 shaft and don't really see how I can repair this one. I see on new ones that they can be shortened to fit the tank, but even that must be something that comes with the unit "after I buy it". i was hoping that there is a way I could bench test this one. The part number is Mastercraft P/N 153260. different from the larger shaft with the magnets.
I think I'll set this thing into a jar of gasoline the depth of the tank and get an ohm reading that way. Hope that it will work. I don't want to just buy a new unit (153260) because I found one on line for $76.00. Pretty pricey; but if that is my problem (not the gauge) I'll do it.
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