Mechanical Advice?

I have an '05 Supterjet - stock motor - everytime I bring it out to the salt water, it runs great, but when I get home and hook the hose up to the flsuh kit, it runs for about 4-5mins then floods and dies. Pulled spark plugs out, found a small amount of water, tried reducing the amount of initial water flow through the flush kit, but had the same problem. Has anyone else ever had this problem or can anyone think of anything that I might be overlooking?

Thanks!
 
I had the water barely flowing through and started the ski up before attaching it, and detached the hose before shutting the ski off. Also, my bilge switch stopped working...I don't think this would have anything to do with the problem though, right?
 
I would guess you probably have a slight head gasket leak and when running under a load with the throttle open and fuel passing through at a higher rate,the motor is burning off the small amount of water leaking in but on the trailer,idleing with no load its slowly filling your clyinders.
 
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