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  #1  
Old 12-14-2012, 04:10 PM
gonofry gonofry is offline
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190 Prostar engine problem

I have a 1990 Prostar 190 and yesterday noticed that there was oil and fuel mixture on my dipstick. Is this a fuel pump problem? At slow speed there is a lot of dark smoke and it is hard to start.
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  #2  
Old 12-14-2012, 04:15 PM
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thatsmrmastercraft thatsmrmastercraft is offline
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There is something making your engine get too much fuel. Likely sources are blown power valve, stuck float or the secondary side of the carb is stuck open. I would start by carefully looking down the carb while it is running to see where the source of all the extra fuel is coming from.

Did your engine backfire through the carb recently? That could cause the power valve to fail.
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  #3  
Old 12-14-2012, 05:03 PM
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petermegan petermegan is offline
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Not at all familier with your engine, but is it running a mechanical pump on the side of the block?
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Old 12-14-2012, 06:31 PM
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thatsmrmastercraft thatsmrmastercraft is offline
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That is a mechanical pump. If the pump fails, the diaphragm usually fails and there is fuel in the overflow tube which runs to the carb.........another possible source- just not as likely as a carb issue.
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  #5  
Old 12-15-2012, 01:02 AM
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petermegan petermegan is offline
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Ok, Just thought if a diaphragm had failed it would have been a large source of fuel directly into the oil. Have fun.
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  #6  
Old 12-15-2012, 01:09 AM
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Quote:
Originally Posted by petermegan View Post
Ok, Just thought if a diaphragm had failed it would have been a large source of fuel directly into the oil. Have fun.
In theory it could, but with the engine running so rich as to be blowing dark smoke at slow speeds, it points to a carb issue. having fun is what it is all about. Cheers.
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  #7  
Old 12-15-2012, 09:14 AM
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Jerseydave Jerseydave is offline
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Power valves are know problems on holley carbs but they usually cause a bad "stumble" on acceleration. Sounds like you have a stuck/sunk float or high float level. With engine warmed up and at idle, look down into carb. If you see it dripping gas into the venturis then you need to rebuild or replace the carb.
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  #8  
Old 12-15-2012, 09:22 AM
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thatsmrmastercraft thatsmrmastercraft is offline
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There is always the possibility that some debris is not allowing the secondary throttle blade to close. Had this happen to me on the first days of a weeks vacation a couple years back. Popped off the secondary bowl, cleaned it out, put it back together and was good for the rest of the week. I do like blue reusable gaskets.
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  #9  
Old 12-18-2012, 11:59 AM
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rjracin240 rjracin240 is offline
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Might be a wild guess.......if you rev the engine before shutting it down this will also in some instances cause fuel to get past rings and into oil sump
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  #10  
Old 01-28-2013, 04:33 AM
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petermegan petermegan is offline
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Gonofry how did you get on? solve your problem??
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