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Engine wont start after it is at operating temp.

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  • Engine wont start after it is at operating temp.

    I recently purchased a 1979 Chris Craft 28' Express Cruiser with twin GM181 inboards. I made three trips, one of which was 1.5 hours each way, without any issues. On my last trip, I had a starboard engine failure on both the 1.5 hour trip out and on the trip home. Both times the failure happened the exact way.

    The engines started fine and ran fine. As I entered the harbor and placed both engines in neutral to dock, the starboard engine died and would not restart at all. I had to dock on a single engine, which in this boat doesn't work so well. After the first failure, I thought it was a result of a ball valve I put in the fuel vent line. I did this because gas spilled out and I wanted to make sure this never happened again. I forgot to open the valve after we were underway. I laid awake that night trying to mentally come up with an explanation as to what the problem might be. It dawned on me the valve was closed and the engine probably died due to the lack of fuel created by the vacuum.

    I went out to the boat the next day, opened the valve and the motor fired right up. Problem solved, so I thought, until a day later when we went back to our home port and the same engine again died while docking.

    Due to my work schedule, I will not be able to see my boat for another 3 weeks and I would like to come up with some likely reasons this happened, possibly order some parts so I have minimal down time on my next time off. I realize it is either a spark or fuel issue. I cant fathom why the carburetor would crap out on me in this fashion, so I am leaning towards a spark issue. Does anyone think maybe there is crack in the cap and rotor that the heat is causing to create an open circuit or maybe the coil is being affected by the heat?

    Thanks for any suggestions.

  • #2
    take the ball valve out of the vent. that is a good way to rupture the fuel pump

    the motor dying could be fuel system relate or electrical system. most likely its fuel.
    1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - http://forums.iboats.com/forum/owner...988-rogue-2420

    Past Boats
    1970 Wooster Hellion - Merc 9.8
    2002 SeaRay 190BR - 5.0 - A1G2 - "Cheasheads in Paradise"
    1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

    What’s behind you doesn’t matter.Enzo Ferrari

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    • #3
      It dies going into neutral makes me think electrical. Bring along a voltmeter and see if you have 12V on the + side of the coil.
      94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
      95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
      07 SeaDoo GTX
      Raw Water Pump Maintenance
      Merc Adults Only

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      • #4
        Originally posted by AllDodge View Post
        It dies going into neutral makes me think electrical. Bring along a voltmeter and see if you have 12V on the + side of the coil.

        Ya, I'm leaning towards the coil too. If I drive from the boat ramp to the fuel dock, it idles just fine and easily restarts. This only seems to happen after the engine has been running for a significant amount of time. I will be checking the fuel line just to make sure it isn't close enough to the engine to be boiling, but I really don't think its a fuel issue.


        Also, I'm not removing the ball valve. There is no way I'm risking a $10,000 fine over spilled fuel. Way to many hippies in my area that would ***** up a storm given the chance and the coast guard is almost always present.

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        • #5
          i'm chasing the same over the last couple years. I think I found a guy who knows what he is doing and it seems to be a lot om little things adding up. I'll post results if it looks like it might help you.

          1979 Carver Montego 2357 | 260 Mercruiser upgraded to Alpha | 2006 Nissan 15hp kicker

          Girls cry and boys fart in front of friends, but girls fart and boys cry in front of true friends.

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          • #6
            Sign up today
            See post #46



            http://forums.iboats.com/forum/engin...-rebuild/page2



            1979 Carver Montego 2357 | 260 Mercruiser upgraded to Alpha | 2006 Nissan 15hp kicker

            Girls cry and boys fart in front of friends, but girls fart and boys cry in front of true friends.

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