My S4 came with only a gascolator with a fine mesh screen. There isn't a filter after the mechanical engine driven fuel pump. No problems to this point. Gascolator seems to catch everything. Float bowls are clean. Would you suggest a filter down stream of the engine driven fuel pump?
When the engine was new and again after maintenance, two years ago, I did have two partial engine failures with small rubber particles being sucked up into the jet. No problems in two years :)
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