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Old 03-27-2013, 09:20 PM
Snipe's Avatar
Snipe Snipe is offline
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Boat: 1998 ProStar 190
Location: Three Lakes,WI/summer;Menomonee Falls,WI/winter
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Fuel Sending Unit

On my, again; "new to me" fuel sending unit.....
How can I check the ohms on this unit after I took it out of the tank. I know I should have left it in there and did the suggested procedure, but I kind of got ahead of myself because I haven't got it "summerized" yet. No battery installed. I hope it is the sender and not the gauge. I just bought this boat and am starting to get it ready for summer. [i] BTW the information on the unit is:P/N is Mastercrat 153260 oper. range 240/33. It is a Centroid Products sender. Is there another unit, like the some on this site that I can use if this is shot??
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Old 03-27-2013, 09:45 PM
Skipper
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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.
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Old 03-27-2013, 09:50 PM
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Barefooter92 Barefooter92 is offline
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mine was a simple fix...be sure to retain the two magnets at the bottom of the fuel basket. I use marine epoxy and fit them back in place. It has worked for 3 years now. '97 PS 205, its very common in this year range.
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Old 03-27-2013, 10:39 PM
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ricford ricford is offline
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I used Skipper's thread to fix mine on my 96 prostar. It's been working for 2 years now, and cost me nothing since the mechanic across the lake from me had some gas proof epoxy that he lent me. Here's the link.
http://www.mastercraft.com/teamtalk/...ad.php?t=38453
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Old 03-27-2013, 10:39 PM
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Snipe Snipe is offline
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Quote:
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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