Hi guys fitted a sytec fuel pump into my octavia Vrs and since then now on a cold start it stuggles to start, once it's started it will start up fine but for the first start up after a few hours of sitting it cranks for abit longer before it fires up any ideas what it could be?

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Vapour settling in the injector?. Mine has a similar issue where it struggles to crank when hot, but only occasionally. It WILL start but just takes a tad longer to fire on cranking than the immediate fire when cold.

Always done it but never got to the bottom of it. On asking my regular mechanic he suggested vapour settling.

I also noticed that starting and stopping the engine with the clutch disengaged makes the problem more common. How about you?.

Is the pump securely seated in the pot?, It could be partially closing off flow at the base of the pump to the pot.