Which pore size is best: 5-micron, 10 micron, 40-micron, or 100-micron?

One pore size is not better than the other. Different micron ratings are required to protect different fuel components. As a rule of thumb: 100-micron for fuel pumps, 40-micron for carburetors, 10-micron for manifold injectors, and 5 micron for direct injectors.

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