In that year, are you sure you do not have 2 pumps for each bag? Usually there is a "main pump" that runs off the sprinkler valves to FILL all bags.

You may need new sprinkler valves. Before I replaced the pumps in my 2007, I did not have to turn on/off the sprinkler valves. I would turn the switch on, then to prime, I recall having the boat in forward, but did not have to go 20mph to start the priming of the pumps.

There should be a scupper-cup on the bottom of your boat to force the water into the main pump.

There are usually other smaller pumpa (on each bag) to drain the water out of the bag through the side of the boat.
Are those working - can you hear them turn on?

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