I have a 1999 Powerquest 22ft with a mercruiser 454 MPI with a Braveo 1 drive. The Fuel Pump is not getting power, causing the engine to just turn over but not fire.
I put direct power to the electric fuel pump on the side of the motor near the motor mount and the boat will fire right up and run great. So somewhere in between the pump isn't getting power.
My guess is either the fuel pump relay, a fuse, or possibly the low oil pressure cut off switch. I didn't see any fuses, but I didn't really look all that hard. I did see 2 relays on the top of the motor, 1 of which when you turn the key on makes a single "click". Im guessing this relay is the fuel pump relay as it should normally come on for a few seconds when you turn the key. The relay is nothing the auto parts stores have so im not sure where to get one.
My question is, how to I diagnose the problem from here without throwing too many parts at it? Is there a way to rule out the low oil pressure cut off switch, if it even has one? Any guesses on anything else is could be?