Dual Pre Filters for Fuel

Alan "Woody" Wood
 

Hi guys..
I have a SM'97 with a TMD22-B 
and MDKDP 6,5 KW genset and would like to change the single pre-filter for a (Racor?) dual filter.  I have no idea what the flow rate is or how to calculate it so was wondering what model of dual filter you have switched to and if you mounted the unit higher on the bulkhead to create more space below for drainage? If so, was there a problem with fuel flow from the tank or priming after changing filters?
Thanks in advance.. 
Woody 

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