Join Date: Jul 2000
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The very BEST way to do all this is to apply an independent onboard recirc. polishing system at ~3-4 gallons per MINUTE @ 15µM (about 1.5µM 'resident' particle value in the tank in 'recirc' speak) to insure that all the 'seed' particles (spores, bacteria, agglomerating HC fragments, etc.) are constantly removed, then std Racor Primary/Secondary (that essentially NEVER gets challenged with particles due to the recirc. polishing system) but delivering into a small 2-3 gallon 'day tank' located DIRECTLY OVER the engine.
The day tank in 'normal' mode delivers to an internal 'weir' inside the day tank that keeps the day tank always ~full of 'constantly flowing particulate free oil'; but, when all hell breaks loose you can open an atmospheric vent on the top and a bottom cockvalve to 'gravity drain' directly to the injector pump. 3 gallons supply on most small sailboat diesels will give you ~4 hours to 'sort things out'. If you have an onboard polisher and an electric fuel pump at the TANK, most of the 'usual' problems are hardly ever encountered .... tank doesnt agglomerate larger and larger particles, fungus is removed constantly, you never build up the thick biomass on the tank walls to break loose and if you do 'break loose' the HIGH TURNOVER rate of the recirculation polisher will quickly bring the tank back down to acceptable (15µM) residual particle distribution level VERY quickly, ..... and you still dont 'challenge' the relatively low surface area racors in doing so.
DO NOT even think about putting a recirculation polisher on a return line .... the return flow is not the HIGH VOLUME ('tank turnover') you need to effectively operate a recirculation polisher.
I can explain more if you need. I can send a .pdf of what Im talking about - email me at RhmpL33ATattDOTnet