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Thread: 350mpi starts and dies

  1. #1
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    Dec 2011
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    350mpi starts and dies

    I have a 1999 28zx with twin 350 mpi. The port engine starts and dies when the engine is hot and it's hot outside.
    I can only get it restarted using full throttle. ( like it's flooded) Any ideas on what is causing this?

  2. #2
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    Feb 2010
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    Sounds like a weak fuel pump. Does it start up after sitting awhile.

  3. #3
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    Dec 2011
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    never waited long enough to find out. But always starts cold.

  4. #4
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    Feb 2010
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    I had the same issue on mine and it ended up being the fuel pump. When the pump got hot it would not pump enough fuel. Tryed changing all kinds of things. ect sensor, map sensor, tps sensor ecu and it ended up being the fuel pump. I hope this helps

  5. #5
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    Dec 2011
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    Thanks to all. I was told by a marina that Mercury has a booster fuel pump that would resolve the problem.

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