Longer tube between tank and engine will be harder to prime when cold. Make this as short & straight as possible, best with an inline filter.
Longer tube between pipe and tank will dampen the pulses, which is a good thing. No harm going longer here, you won't "lose" pressure. The tank doens't need huge pressure anyway, just a gentle puff - otherwise your carb settings will be extremely twitchy & sensitive (& very hard to start when cold).
When racing, volume of tank + filter + tube must be under the limit set by the rules. If you have too much volume you will be disqualified. That's why most cars' tanks are smaller than the set limit (eg 75cc, 125cc) to allow for the extra outside.
Some ppl use 2 filters to give extra volume... to give slow marshalls extra time.
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