So first day on the lake and my left rear pump is't pumping. It's trying to pump but nothing is coming out. On the water I took off the output hose to see if it was something with my hoses...turned on the pump expecting to get water out and nothing...the other two pumps are working fine. Obviously something has clogged the intake but how can I check that? Obviously when we get back on the trailer I can look and see of there is something there but if I don't see anything what else could it be?

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