Noel, I like the idea.
Note that along with the electric fuel pump, USCG regs require us to incorporate a means of cutting power to the fuel pump in the absence of engine oil pressure.... or more specifically, if the engine was to stop running due to a severed fuel line.
This is fairly easy to do.
You will install a N/O (normally open) Low Oil Pressure switch into the engine's oiling system.
The LOP switch (when approx 4 to 6 psi oil pressure is achieved) will trigger a relay.
The relay will then power the fuel pump.
In the absence of 4 to 6 psi oil pressure, the relay will drop out of the loop, and the fuel pump will stop working.
That covers the safety feature.
Now you will need a means of powering the fuel pump prior to engine oil pressure.
Two ways to do this:
1 ..... a start-by-pass circuit that uses the starter motor solenoid circuit to temporarily trigger the relay.
2 ..... a momentary helm switch (must be "momentary") that will temporarily trigger the relay.
#2 allows the operator to prime the fuel delivery system without cranking the engine over.
In the long run, this will extend starter motor and battery life.
Your call on that!