And of course flow.

Worth noting the little Sytec filters are crap unless it's a low flow/power setup.

And the mention of a "30 micron" filter above...the only place I've seen sell 30 micron are Torques...and I suspect that's more like 130micron the amount of dirt they let through.

In general, 40-100micron pre pump.

And 10microns or less post pump to protect injectors. But as said..some might be happy with a genuine 30-40 micron...some will die very fast at that.

I ran my own for years with only a 40 micron, although a reputable brand. A friend ran his with the Torques 30 micron...and killed the injectors in a matter of weeks. 2 sets actually !

Needless to say there is a proper filter in place post pump now.