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Old 06-23-2003, 01:24 PM
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Question Marine 383 carb issues

I have a 383 stroker in my boat. Everything including power is perfect except the carb. I have an edlebrock 750 performer (marine) and it is sending a lot of fuel through. There is a lot of black fumes visible when the engine is idling. I am at 4000 ft. and have tried to dial this in, but have not been able to yet. I have also tried turning the fuel / air screws all the way in and the engine does not change rpms at all. Any clues on this?

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Old 06-23-2003, 03:27 PM
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What type of fuel pump are you using?
You may need a pressure regulator.
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Old 06-25-2003, 09:33 AM
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Sorry for the delay. It is a cam driven standard side mount pump. Do they come with diff. presure settings?
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Old 07-01-2003, 02:29 PM
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a 700cfm carb is way to big for a 383 try a 650 or a 670 should work great. I've run into these problems many times at work(certified marine service tech.) I'v found a holley 670 works the best (if you're running an electric pump limit the presure to under 7.5psi or you'll over ride the floats. if you have the stock style mechanical pumb dont worry about psi settings(stock pump only).
good luck if you have any other questions sent an e-mail or post more.
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Old 07-06-2003, 10:44 PM
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A couple questions, is the fuel visibly running over, or just bad fuel economy?
Carb size is not necessarily the issue. It is possibly that the primary jet size is too big , or the spark plugs are possibly too cold of a heat range(boats run remarkably cool). I agree that a fuel pressure check may be in order, but a stock $20.00 pump usually only puts out 6 lbs which does not need a regulator. If it is a high pressure Carter or Holley, then get the part number and talk to the manufacturer, it may need a regulator. If it has one, is the vacuum advance hooked up to the distributor? This will lean out the mixture at idle/slow cruise and may improve your fuel economy.
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Old 07-06-2003, 11:18 PM
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If it has a very big cam, I would say the idle transfer slots are exposed at idle. Take the carb off and look below the throttle blades to see if they are open too far exposing the transfer slots.
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