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    86 Mercruiser running rough after fuel filter change??

    We have an 86 Mercruiser 3.0 that prior to the fuel filter change was running great. We changed the filter for normal maintenance and we noticed that the fuel pump sounded like it was pumping hard( converted to electric fuel pump 2 years ago). Took it out this morning and it would start but not...
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    1986 Mercruiser 3.0 tach issue

    We have a Merc I/O 3.0 1986. Last year we replaced the old ignition system with electronic ignition. We found out during this process that we had a bad tach. The tach was disconnected and the boat has run beautiful minus the tach which would be really nice to have since we need to adjust our...
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    Trim pump problems!!

    We are restoring our boat and we had to remove the side panels for new vinyl work. We removed the shifter with trim switch making sure to take note of the way the wires were hooked up. After the new side panel went in we put the shifter back in and hooked all the wires back up according to the...
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    Mercruiser 3.0 won't start after ignition upgrade

    I am hoping that someone may have an answer to this dilemma..... I'll start by explaining what has been done first. We decided to upgrade our ignition system to the Delco EST ignition system. The boat is a 1986 and has a 140hp Mercruiser I/O Alpha one and we just got sick and tired of replacing...
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