Unfortunately, I believe you are going to have to pull the tank, cut some access ports, clean the bio-growth and install plates:
http://www.downwindmarine.com/SeaBuilt-Tank-Access-Plates-p-91002326.html
An installed drop tube with fitting to fit an oil extractor would allow you to periodically remove tank bottoms (water). Pumps emulsify water, so it would be best to have the pump AFTER the filter. Draw the fuel with water into the filter and let it do it’s job. My tank has a drain plug at the low point, which could be fitted with a petcock for draining tank bottoms.
Believe those Catalina tanks are baffled and that bio growth will dog you until it is scrubbed out. Biobor really does seem to prevent it, but it won’t dissolve it.
http://www.downwindmarine.com/SeaBuilt-Tank-Access-Plates-p-91002326.html
An installed drop tube with fitting to fit an oil extractor would allow you to periodically remove tank bottoms (water). Pumps emulsify water, so it would be best to have the pump AFTER the filter. Draw the fuel with water into the filter and let it do it’s job. My tank has a drain plug at the low point, which could be fitted with a petcock for draining tank bottoms.
Believe those Catalina tanks are baffled and that bio growth will dog you until it is scrubbed out. Biobor really does seem to prevent it, but it won’t dissolve it.
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