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1990 merc 115 4 cylinder


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LAst year had electric fuel pump on boat worked great until the ethyl alcohol ate pump.So I rebuilt the fuel pump on motor worked for about and hour then lost half of throttle thus lost speed.Carbs were rebuilt last year. Looked for vaccum leak none detected .She is the 4 cylinder model with idle speed she runs on two cylinders..Please give a clue to whats going on?

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