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Hello. My name is Tan.
Could I get the engine serial number please?
The fuel pump should only have power when cranking, initial key on and engine running.
Have you tested for voltage when cranking? Do you hear fuel pump run momentarily when key ois turned to on?
Try applying voltage directly to the fuel pump. Does it run?
This will eliminate the fuel pump leaving us with and electrical issue. You didn't tell me whether it has power or not when cranking?
I also need the engine serial number to know exactly what you have. Different engine have different circuits.
There is an oil pressure switch # ***** that turns pump on once you have achieved oil pressure. http://www.marineengine.com/parts/mercury_marine_parts/static/img/COMMON/2207.gif