You gotta be getting water in there pretty fast for the automatic bailer tubes to not be sucking it all out! Check your carbon seal, try to pull the seal back (towards the pump) by hand... it should be nearly impossible to pull it back by hand, very difficult! Also, crawl under and check the bolt at the front of the intake grate... is it there and tight? The hole that front bolt goes into goes completely thru and into the inside of the hull... if that bolt comes loose and vibrates out, water will pour in thru the hole not to mention your grate may snap off at higher speeds (if it hasn't already gone AWOL... you may not notice much change if your intake grate has come off, it'll still run and pump water it's just sloppier handling mostly).
Finally, check all your hoses... you may have a hole in 1 of the water lines. Take the seat off on the trailer, hook the pump up to a water hose, start the engine THEN turn on the water hose and look inside with a flashlight for water spraying from a line somewhere. Remember to turn OFF the waterhose before shutting the engine off, or else you'll flood the engine thru the exhaust valves!!! Engine on, water on... water off, engine off! 10 minutes run time on trailer max with water hose, the carbon seal slowly heats up and isn't being cooled by the water hose water this way. I prefer to run less than 5 minutes on trailer with water hose.
Lastly, consider installing an automatic electric bilge pump in your watercraft... something like 600 gph, sure gives peace of mind that it won't sink while at anchor or tied to a dock if it is taking on water without your knowledge! Automatic bailers only suck water out of the hull when the engine is running! There are how-to threads on how to do this if you want, the cost can be as low as $60 if you do it yourself (bilge pump, wire, switch for manual operation, bilge hose and thru-hull fitting).
- Michael