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    Mercruiser 4.3 EFI - No Spark

    My boat is fitted with a Mercruiser 4.3 EFI with what I believe is a Thunderbolt IV ignition system. The motor consistently starts promptly and runs smoothly at all speeds. On the water today I had just got up on plane when the motor sputtered, died, and has since refused to start. The twin...
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    4.3EFI - No gas at injectors

    I'm still trying to work out why I have no fuel. I've read the 'sticky' on fuel systems, but the recommendations seem to mostly refer to tests with the engine running - and mine won't start. Pulled in for gas with 1/4 tank. The engine, which had been running flawlessly up till that time, would...
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    No fuel getting to 4.3L EFI Mercruiser

    I have a retrofit Mercruiser 4.3L - about 2000, I think. I pulled in for gas this past weekend with 1/4 of a tank on board. After filling up, the motor would crank, but not start. Checked for spark - good. Took the spark arrestor off and noticed no spray of gas. The motor would immediately start...
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    How to add sternleg gear lube

    I have a Mercruiser 4.3efi - with a gear lube reservoir for the sterleg. Thought I'd checked the reservoir earlier this season, but when the alarm went off yesterday I found that the tank was basically empty. I imagine I may have a leak, but as a first step I want to top up the gear lube to see...
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    Mercruiser 4.3 efi - oil leak

    My boat has been sitting for a couple of years. When I fired it up last week it started fine and ran well. Today I noticed some water mixed with fresh oil in the bilge. I've identified a few drips of water from the weep hole on top of the water pump, and will monitor it and, if necessary...
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