Quote:
Originally Posted by Dave R
Yeah, I was pretty shocked when I could not get it to run the first time I changed the fuel filter. The fuel pump draws fuel from the tank, through the fuel filter and then pressurizes it for the MPI system. The "brains" of the system allows the fuel pump to run for a few seconds when you first turn the key on, then the pump shuts off and presumable turns on again while cranking the engine. It does not hold the vacuum to the fuel tank well enough to fill the filter, no matter how many times I cycle the key on and off and letting the engine crank for a long time is not good for the starter or the batteries. If I pour a few ounces of gas in the filter before installing it, it fires right up and runs perfectly. From what I've read on line, this problem is pretty common and is likely a function of the boat design more than the engine.
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I think the OP said his engine was 25 years old. My 1986
"MCM 260" (5.7L GM V8) has a mechanical fuel pump supplying a 4 barrel carb. I've never worked on fuel injected so I can't comment there. I think for the Mercruiser years 1986-1994, ONLY the Gen II 4.3L V6 had an electric fuel pump. No fuel injection.
NB
EDIT: Like somebody else said..maybe we need more info..like what engine...
The trouble is if a boat owner doesn't know much about engines he is totally at the
Mercy of the
"Mechanic".....