Help !!!!! Wilma 8 big xl

Hi and good evening I'm wondering if anyone can help , I have a Wilma 8 pot 11 litre system newish when I first had it up and running everything was great after a week the pump wasn't coming through three of the lines after reading a thread about the pump not being strong enough I purchased another and still the Same so today a purchased a even bigger pump and thought brilliant answer to my problem!!!! But no still not coming through 3 of the eight drip lines I have cleaned them blown them and just about everything else ,,,, has any one got any ideas before I bin it and go back to hand feeding
Thanks in advance
 
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