Fuel Filter Empty

Is it vapor? When i ran a Holley double pumper it was set up with two transparent fuel filters immediately before the carb inlets. The filters normally looked only half full--until I added an aluminum "cool can" and added ice at the drag strip--the filters thereafter would be completely full (as long as the ice held out, that is). I was using a Holley electric fuel pump with pressure regulator at the time (no mechanical pump).

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