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  #1  
Old 04-29-2013, 11:41 AM
jwcrawford81 jwcrawford81 is offline
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Boat: Mastercraft, 1997 205 Prostar
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Engine will rev in neutral but not in gear

Boat ran 25-30 mph when first in water then got slower and slower. When you open throtle to full position it has no power in gear. However, when in neutral it revs like expected. I think I can hear the fuel pump running constantly, is it supposed to do this? Could this be fuel problems or transmission problems? Boat has new plugs, new rotor button, and fuel pump is 3 yrs old. Need help or suggestions.
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Old 04-29-2013, 12:12 PM
88 PS190 88 PS190 is offline
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Boat: 1988 MC Prostar 190, 351 Ford
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With boat OFF and in neutral check prop shaft for free rotation

Check underwater gear for ropes, fouling.

I bet it doesn't turn well. Any transmission problem would be engine revs no forward motion, or boat won't go to neutral.

My bet is that the shaft is bound somehow, did you hit anything?
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  #3  
Old 04-29-2013, 01:04 PM
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eurosysytem0 eurosysytem0 is offline
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Whats the boat? If its got the old style distributor with points and capacitor, it could be the capacitor.
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Old 04-29-2013, 04:08 PM
jwcrawford81 jwcrawford81 is offline
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1997 Prostar 205.....not sure what style distributor.
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Old 04-29-2013, 04:07 PM
jwcrawford81 jwcrawford81 is offline
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Checked prop shaft and it turns freely. Ran boat yesterday out of water in gear and ran fine without load. Problem seems only to be when boat is in water.
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  #6  
Old 04-29-2013, 04:12 PM
jmhjgh jmhjgh is offline
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Make sure the gas valve is turned all the way on (located on top of the gas tank behind the rear seat).
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Old 04-29-2013, 08:23 PM
jwcrawford81 jwcrawford81 is offline
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Boat: Mastercraft, 1997 205 Prostar
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checked gas valve its open. took off fuel line at pump and drained as much gas as i could going to check fuel pump tomm and put fresh gas in
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Old 04-29-2013, 08:56 PM
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j.mccreight@hotmail.com j.mccreight@hotmail.com is offline
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I have heard that the anti-siphon valve can get clogged and cause loss of power, try loosening the fuel cap so the tank does not go into a vacuum and see if the problem is still there...
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  #9  
Old 04-30-2013, 10:29 AM
jwcrawford81 jwcrawford81 is offline
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do you know where the anti syhon valve is
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  #10  
Old 04-30-2013, 04:43 PM
jwcrawford81 jwcrawford81 is offline
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Boat: Mastercraft, 1997 205 Prostar
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Talked to the boat center that tried to fix my boat. They said they checked fuel lines fuel pump and fuel filter everything was good. Not sure what to check next. Any advise?
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fuel pump, power loss, rev

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