I have a 230V Marathon pump feeding 5 AC units. The AC pump is not "on demand" - it is powered up seperately from the main panel, and runs continuously unless manually turned off, regardless if any of the AC units are turned on. I recently moved the boat to FL (had been keeping it on the chesapeake bay). After beeing away from the boat for 2 weeks, I started the pump and noticed water was not flowing. I checked the sea strainer and it was badly clogged with growth - very difficult to remove stuff, like weeds clinging to the strainer bowl. I got it cleaned out, added some chlorine tablets to the basket, powered on the pump and it still doesn't start. I can't detect any sort of humming or vibrating or any indication that it is running when powered on. I attempting to re-prime the system by 1) removing the bleed screw from the top of the pump - water streams out. Pump seems to be below the water line. 2) there is a t on the outlet where the water is diverted to a bank of 4 A/Cs on one side of the boat and another AC on the other side of the boat. I couldn't figure out a way to prime both sides at once without installing a new T and garden hose adapter, so I removed the raw water inlet hose from the AC on one side of the boat (we are above the water line at this point). I put a garden hose to it, in my mind forcing any air back through the line, through the T at the outlet of the pump, and through the line that feeds the other bank of A/C's. This should leave water in the system all the way up to the inlet of the AC's units on both sides, but not all the way through the heat exchangers to the raw water outlets on each side of the hull. I thought this would be sufficient to prime everything; perhaps not. I turned the power on to the pump, and it still won't turn on. I verified power at the panel/breaker; i have not checked the power on the pump side because i have no reason to suspect a power problem given the sequence of events above. Is the pump not starting symptomatic of a priming issue, a suction issue (e.g., not enough flow through the strainer to the pump), either, or neither? To prime the system, do i need to get water all the way through to the AC outlets above the water line on the boat hull, or is it sufficient to just everything filled with water from the through hull inlet through the pump and up to the AC raw water inlets? Is it worth dissassembling the wet end to check the impeller? I'd assume if the impeller was bad, the motor would still turn, it just wouldn't pump anything.