blwn-by

So its a LS2 block and the Knock sensors are down by the LT headers on the block. Went to go start the car and the pumps wouldnt prime, long story short i traced it down to the knock sensors (i think) would this be a reason why the pumps would NOT prime and fail to start? checked the pumps and fuses its all good to go.... this is the only thing i can think of....help!