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Yanmar engines are found on many tractors .... simply go online and do websearch: "tractor+parts+Yanmar".
Such a replacement engine mounted filter for your engine (not a filter-separator) should have a µM removal 'rating' of 15-17µM.

However, if what you lost overboard is the small 'filter' thats mounted ON the engine it will be a very poor 'water separator' as its not located in bottom-most portion of the fuel delivery tubing where water will accumulate. A Water separator NEEDS to be placed in the VERY LOWEST portion of the fuel delivery piping.

If you NEED a water separator due to your history of operation, then I suggest simply to put an EMPTY filter housing with an integral bottom/'bowl' drain cockk valve in the lowest level of the fuel delivery system. Using an empty filter housing (with drain cockk) to trap water is known as a "knock-out pot".
 

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Id recommend that you get the water out of the tank, fuel lines (especially the lowest part of the fuel lines) and any other filter in the 'set' before you restart ..... hitting a HOT injector(s) with a 'slug' of water can 'shatter' the tips of the injectors. Water - drain it, and then BLOW all the system 'tubing' out.
With most Yanmars you dont have to bleed the whole system to restart ..... just bleed 'all' from the tank, the filters, the engine 'guard' filter .... everything up to but not necessarily including the high pressure fuel injection pump nor the injectors. 99% of the time this will air bleed a Yanmar as the injection pump and the injectors can handle 'slugs' of air.
Be sure to 'lubricate' the filter gaskets with fuel oil when reinstalling; dont overtighten the flare fittings or (god-awful) 'compression' fittings as they are easily 'cracked' by gorillas with wrenches.

;-)
 
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