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My A4 had a CAV (Lucas - I've only seen one model in yacht suppliers) filter/separator that had relatively inexpensive large-diameter cartridges that I changed only every two years. It worked fine. Because I was confident of its effect, I removed the filter in the base of the fuel pump; this had clogged with gum on two occasions despite being replaced annually. No problem after that.
My diesel has a Racor (200 series - don't remember exact model), which works well (no issues, anyway) and is nice for having a built-in primer pump, which means you don't have to prime the engine's fuel pump when changing the filter. Filter cartridges are $50, which is a fair markup on porous paper.
When buying a separator/filter for a gas engine, make sure you buy one with a metal bowl and plug, not plastic. Being able to see if there is water in the bowl is nice, but plastic is not fire-rated for a gas engine and it could void your insurance.
As to the reddish metallic deposits -- have a look inside your gas tank. Is the tank aluminum or steel? If the latter, get rid of it asap. Also pull the fuel sender -- you may have rust like that shown in Black Arts >> Gas tank warning. Drain and clean the tank thoroughly. If those little bits of crud get in your carburetor, you'll have all sorts of problems and in my experience, the only remedy is a new carb.
David Weatherston
Towser, Toronto
C&C 27 Mk IV
Addendum - Location of my filter has always been on the bulkhead at the forward end of the lazarette hatch. The only thing to watch on the Racor is that you must have clearance above to work the priming pump, which is a vertical piston.
Last edited by (2010-01-12 06:55:41)
David Weatherston
Towser, Toronto
C&C 27 Mk IV
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The metal Racor fuel/water separator/filters are popular in the A4 fleet, it seems. Not sure what the best advice re location is. Ours is in the fuel line where it exits the fuel tank. A4s also seem to like a finer, 7 micron secondary inline fuel filter between the fuel pump and the carb. Visit the forums at www.moyermarine.com for lots of info on the care and feeding of Atomic 4 engines.
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1974 Mark II C&C 27
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1974 Mark II C&C 27
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