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Hello. My name is Tan.
Once the engine starts the fuel pump relay is energized by the alternator. Check the green wire coming off the alternator does it have voltage when engine is running?
Here is the fuel pump circuit. http://forums.iboats.com/filedata/fetch?id=6991400
The way the relay works is the cranking the engine energizes a coil in the relay connecting battery power to the fuel pump. So you have 2 sources to power the relay start circuit and the alternator. They look at it like if the alternator quits you won't run the boat any way as the battery will go dead. You can blow the ignition fuse and the engine will quit running. There are allot of things that can go wrong and strand you.
To get back to port all you would have to do is use a jumper wire going from a 12 volt source to run the fuel pump. If a mechanical pump quits you are done.
Ok keep me posted. I like to do the run test and check voltage at the alternator and the relay you could have a blown diode in the harness. So if the alternator checks good then you have to check for voltage at the relay with engine running. If no voltage then the diode in the harness is bad.
Could I get the engine model number please to be sure I have the correct model please?