Great info. I am pretty familiar with the Carter AFBs, and rebuilt a number of them back in the 60's. Fairly straight-forward carbs, and not bad to work on.
With the engines in our CC Commanders being on such an angle, I wonder about setting the float level and drop. Of course the level needs to be set to prevent flooding raw gas into the carb. But so far I have not actually found specs for the dimentions to set the floats for when mounted on an angle in a boat. Anyone have definitive data, or if not then data from what worked for you?
We are experiencing some starving of the engines at about 3000 rpm (all of a sudden the RPM drops off sharply). We are struggling to find the cause.
First, as much work as we have done to get the junk out of the old fuel tanks and fuel, I know there is still a lot of stuff in there. We pumped out much of the old fuel and diluted what was left with lots of new gasoline, but it is really hard to get everything out of the old tanks without cutting an access hole in the top to physically get inside.
The possible problems (I think) are a clogged intake screen inside the fuel tank (if there is such a screen), clogged fuel filter (this boat has "diesel" type filters -- very large capacity, but fine porosity), and inadequate fuel pumps.
About the filters -- when we bought the boat it had 1-micron filters installed. Totally wrong for gas engines! We changed to 30 micron, which is the most porus available for this housing, but is probably still way too fine. We have changed them out a couple of times, and they seem OK but who knows? We may have to buy a different filter housing which is designed for more porus gas filters.
Anyway, to conclude this rambling posting, I would like to get the carbs rebuilt and set up properly to at least eliminate that element to our "starving" problem.
Best wishes, Curt...
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1967 fiberglass 38' Chris Craft Commander Sportfisher with twin 427 CID 300 HP engines.
