.... you don't get a HUGE number of stones coming up and hitting the fuel filter on a MicroLight when it's flying.... You don't get many microlights crashing into each other (well: more than ONCE) breaking each other's filters. You don't tend to restart your microlight once you have ploughed into a series of fixed tyre barriers which may have cracked the fuel filter..... Not many microlights suffer the vibration and g-loading that karts take (easily peaking at 5g on hitting kerbs on corner-exit, for example) EVERY lap and EVERY race.
And so on.....
Karts are NOT Microlights!
The logic on a race vehicle is simple..... anything you add increases the number of things that can go wrong.
If you can get 'crud' into your carb, your filter on the funnel is faulty. If not, then you didn't clean the tank well enough before you started or you are failing to clean the OUTSIDE of your funnel between re-fills. The outside of the funnel can pick up 'muck' by (for example) putting the funnel on the floor/track between re-fills.
Ian!
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