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So these new fangled Yanmars come with both an engine mounted and remote pre-filter?

Sounds like I'd lose the Yanmar pre-filter altogether and replace with a Racor. Intuitively, those bango fitting are not the best inlet for a fuel filter.

I'm not a fan of dual 2 micron filters in series. That means that everything clogs the first filter and nothing ever gets to the second. If you had real sediment, I think that shuts off the fuel sooner.

I use a 30 micron Racor and a 2 micron engine mounted. The big stuff is caught first, as well as the Racor separating any water, then the 2 micron gets anything left over. Change them both on schedule, which is annual for my use. I would change every 6 months, if I was full time and taking on suspect fuel.
 

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One thing I substantially prefer about the Racor 500, over the Yanmar filter in your pic, is the clear bowl. You can visually see sediment and water.

You probably know this, but the 500 comes with and without a metal cup under the clear plastic bowl. I understand the metal cup is necessary, if mounted in the engine compartment. I'm really not sure if it's to deflect heat or catch a drip. It's nearly impossible to ignite dripping diesel fuel, unless a fire is already raging, in which case, I don't see the cup helping. :eek
 

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Almost unheard of to pump bad fuel in New England. Water maybe, but still uncommon.

I've been in third world countries, where fuel has been hand cranked out of 55 gallon barrels off a flat bed truck. Into an aircraft! Guess how long you sit there on the ramp, running up the engines to insure the fuel isn't contaminated. :eek
 

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Another thought is to use a pre-fill filter. I read in PS that the West Marine pre-fill rated best. I have that one and don't like it. Takes forever. I think they all might. The Baja filter is popular and expensive, but I've never tried it. Also gets good ratings. Says 2 gallons per minute filtration rate. We can easily take on 60 gallons (we hold 110). That's a half hour. I suppose, if cruising the islands, it's just part of the deal.
 

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.....Every trawler I've been on has a for real polishing system and a day tank. You could have dead bodies floating in the fuel tank(s) and the engine would be fine. Has anyone here done something similar on their boat?
Good point. No way one is prefiltering at 2gal/min, when taking on 1000+ gallons. Not humanly possible.

Best I can tell, polishing systems are nothing more than a couple of filters in series that recirculate the fuel. Probably a 10 mic and 2 mic in series, with water separating filters.

They would be a great idea, if one has the space, power and money. 2 Racors, a pump and all the supplies and fittings is probably running north of a boat buck, before all is done. I wonder if one could rig a dual R500 system to do double duty. If each filter went to/from a mainfold, some valving might do the job. Motor away from the dock, drop the hook, turn some valves and power up the polisher, while one cracks a cold one or makes a meal. Interesting thought.
 

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I don’t have heat shields on mine either, but they are in a cabinet outside the engine room. Does that ABYC quote apply regardless of where they are installed?
 
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