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Hello, my name is***** will assist you.
The guardian system on Mercury engines wil reset once the condition clears or the key is cycled. If you are still getting the alarm, make sure that the engine is not overheating and that the oil tank on the engine is full. If those items are both good, i will need the serial number to dig deeper into the engine with you.
If you could provide the serial number from the engine, I can get you all the causes for the alarms.
The alarm if a beeping tone would be for low oil on the tank of the engine. If the tank is actually full, disconnect one of the wires going to the cap, if the alarm stops, replace the cap. If the alarm is a solid tone, that is for overheating, inspect the cooling system on the engine and make sure that it is all clear, including the overboard at the rear of the boat.
It is just a booster pump to help the pulser pump get fuel to the carbs. The ECM is what tells it to come and turn off.
When you turn the key on, do you hear a test beep?
No it is only for priming to assist starting.
Have you tested to see if it is running when cranking the engine over. That would mean removing the discharge line from that pump, placing a container under it, then crank the engine over to see if you get any fuel from it?