Are there filters fitted to the fuel tap? It may be those, that are restricting the flow. Instead of a filter why not install a trap ? I have a glass see through filter but with the filter removed. The glass bit is down low so any sediment or water is trapped in the glass bowl. Most crud is heavier than petrol.
fuel line runs, tap to trap which is lower than the carb. then trap up to carb. Any sediment remains in the trap and can easily be seen. Both input and exit to trap are higher than the bottom of the trap.
This system presents no restriction to fuel flow, just uses gravity to trap sediment, water etc.
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