500FG Series Racor
but not for the reasons mentioned thus far.First of all, you want maximum capacity in the filter's ability to take on a large quantity of contaminant. When (not if) junk dislodges from your fuel tank you'll be glad to have a filter that can swallow it and not immediately plug up. This'll be especially meaningful when you're committed to a truly snotty inlet.Secondly, when you DO have to change the element in a hurry (is there any other way?) you'll want the ability to drain the bowl, pop the top, drop in another element, refill and get going in minutes without flooding the area in spilled diesel fuel. If you're really smart you'll plumb two in parallel so that you can simply throw a valve to switch to a clean filter.Don't even bother estimating flow rates. Most diesel auxillaries won't come near challenging the flow capacities of all but the smallest filters. The 500FG flows 60 GPH. You wouldn't be near that but that's not a bad thing.A couple comments about the see through bowl. If mounted in a visible spot it will allow you to spot water that has been 'spun out' but it will NOT clue you in to how dirty the element is. The only sure fire way to guage remaining capacity on the element is to add a vacuum guage (an option on this model.)As for a fire corrupting that plastic bowl, I'll just suggest that you might want to be equally paranoid about the several FEET of RUBBER fuel hose you probably have running though your engine compartment. You could, of course, isolate the filter from the engine area but if you've got raging flames roaring through your engine compartment that can't be contained then I'd humbly suggest that the bowl is the least of your concerns and that you should get off the damn boat. I can't quote CG regs but for those concerned about such things the Racor can be had with a metal bowl.Yes, you should absolutely be concerned with fire onboard but I'll bet you'd be more likely to lose your boat on the rocks because you saved a few bucks on a cheaper filter and it left you stranded.Just my 2 pennies.