If the engine manufacturer does not specify, I would suggest a filter micron anywhere from 50-120. My feeling would be one more towards the 100
Reasons:
- The engines fuel delivery system will be able to handle a certain particle size without damage or blocking. No point in filtering out these particles.
- Too small a micron leads to more rapid blocking of the filter = more frequent changes = more cost for no discernible benefit.
Personally I preferer the "plastic' transparent body/casing, gauze media filters. These are almost indestructible, allow for inspection without removal, the gauze media will not breakdown/deteriorate, can be cleaned using compressed air but better to replace . Good examples are made by Baldwin & Hengst (be careful to select original manufacturer


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