My 4.3GL Volvo Penta SX started and ran fine when the boat was put in the water the first time this season. We used it for a few hours, put it back on the trailer, towed it home and flushed it out. It sat for two weeks and was then put back in the water at the boat ramp. The engine turned over, sputtered for 2 or 3 seconds but wouldn't fire after numerous tries. I put the boat back on the trailer, towed it home, hooked it up to a garden hose, it fired right up and ran fine. The exact same thing has happened on two more trips to the boat ramp. The engine won't start in the water but will fire right up when on the trailer when hooked to a hose. This last trip, I tried to start it on the trailer while it was backed in the water at the ramp and no luck but when I hooked it to a hose after returning home, it started right up. Spark plugs and fuel filter have been replaced. Any suggestions?
