Does it work for draining the bag sometimes, or is it always dead? We've seen this problem on quite a few Supra and Moomba boats, but typically it's because the drain pump isn't connected directly to the bag. Aaron is correct though, the pump closest to the bag (and connected to the bottom port) will be the drain pump. The fill pump is back near the transmission and v-drive. The first thing to check would be proper operation of the drain pump. The easiest way to do that is to take it out of the bag, and then look into the end to see if the aerator moves when you turn on the drain switch.
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