Volvo Mini Excavator ....mechanical question

Hello,
I have a 2006 Volvo Ec15b with low hours (500) it runs fine but has a difficult time starting up.
On a cold start, the engine turns for almost 12-15 seconds before it fires up.
The warmer is it the faster it starts up.

It has a brand new battery and fresh fuel filters.

Is there anything else i can check or change before i play with the fuel pump ?..

thanks in advance.
regards, Nick.

Volvo Mini Excavator ....mechanical question