I have a 1995 mercury 115 I took the boat out today and it ran great. After about 2hrs an alarm started going off It would go off when I increased the speed and then stop once I slowed down. We stopped the boat and after about an hour I tried to start it back and it would not start the engine would turn over but the motor would not start. The oil looked a little low but only about 1/4 inch below the line is this the reason the alarm was going off and did this cause the boat not to start back? someone said it could be the VSO pump? Please help