Join Date: Jan 2003
Location: Maine Coast
Thanked 287 Times in 220 Posts
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It's not sucking air...
If it's on the pressure side then no air is being sucked in, hence the bubbles. It's kind of hard to blow bubbles whilst sucking.... In either case you do seem to have a leak. I once took a banjo washer to my wet stone/diamond stone, for sharpening knives, and "smoothed" it over. It worked after that. If you don't have that you may try a piece of 400+ grit sand paper on a piece of glass or a very flat and hard surface.. Flipping it over might also work..
Just know that many secondary filters, the ones mounted on the engine, are between 2 and 5 microns so using a 30 may plug your engine mounted filter significantly faster if your tank is not totally clean. My Westerbeke's primary filter is rated as a 3 uM/micron so I use a 10 on my primary Racor 500..
If you know your secondary filter is a 10uM then use a 30uM primary. However if your secondary is a 2uM or 3uM use a 10uM primary.. Hope that makes sense..
-Maine Sail / CS-36T
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Last edited by Maine Sail; 05-24-2008 at 02:59 PM.