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Old 08-26-2013, 10:02 PM
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scottpiper27 scottpiper27 is offline
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Join Date: Apr 2010
Boat: 1990 Mastercraft Prostar 190
Location: Puget Sound
Posts: 49
Hi 88 - My ski partner has the exact year and model and had the exact same problem last week. Water pump leak at the back, water vaporizing off the belt, causing the carb to gag. We tried replacing the seals but it didn't work well. Then we just sucked it up and spent a couple hundred on the whole new pump, easy install, now runs like a dream. The others above may be more skilled and knowledgeable than I, but I would just go for a new pump. Good luck.
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Old 05-27-2014, 11:27 AM
88inNH 88inNH is offline
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Join Date: Jun 2006
Boat: 1988 ProStar 190
Location: Northeast
Posts: 33
Just to follow up / close this out for the next guy:

I got tremendously lucky tracing the "cutting out" issue. I started at the key / ignition (since episodes felt like key was being turned off). Pulled the dash and immediately found a loose terminal on the ignition switch. I assume bouncing over waves was causing it to break contact. Tightened down / problem gone. Better to be lucky than skilled, eh?

Also, ordered the whole raw water pump. Plan to install this weekend.
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