Can anyone tell me how the fuel system on a Mercruiser 4.3EFI 2001 vintage works? My boat won't start - there's fuel in the tank, spark at the spark plugs, but no sound of the fuel pump running and no fuel at the injectors. All the fuses are good and I also tried swapping the two relays over. If I could get to the fuel pump I would test for voltage at the pump, but it is buried somewhere under the port side of the engine.
The fuel line from the tank comes in on the starboard side and runs to the water separator filter which is buried under the starboard side of the engine. I was wondering if anyone can describe how the filter/separator is connected to the fuel pump, where the fuel lines run (I assume there is a pressure regulator in there as well somewhere). It looks like there are three connections to the fuel filter, which I don't understand, so if anyone knows what that is about that would be handy.
Any explanations, tips or general pointers would be useful before I dismantle half the engine to get at the fuel pump.