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2002 searay won't start when warm

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  • 2002 searay won't start when warm

    I have a new too me 2002 searay 190 with 4.3efi
    Boat starts perfect when cold and perfect when hot. But after running for a while then just stop and float for say an hour or so boat will not start. Have to let it sit till engine temp drops below 130 before it will start. Then it runs fine. It seem that if engine temp is below 150 but over 130 it will not start. Has anyone else had this problem? Any help would be great. Thanks

  • #2
    My first guess is vapor lock. When the engine compartment gets some heat soak happening after running for a while, the het builds up and causes the fuel to boil. The increased pressure creates a vapor pocket in the fuel system. When the motor is cranked over there is no fuel to run. If the motor cools back down it will start. It will start back when hot if it has not been shut off very long.

    Merc has attempted to fix and says to make sure to run the blowers when idling after a good run for a while. Has even installed a boost pump and this has helped some. Open the engine hatch to help it cool down. The real fix is a rerouting of the return fuel line from going back to the filter, to return it back to the tank
    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
    G-Dad always said "First Liar doesn't stand a chance"

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    • #3
      Have you tried advancing the throttle when cranking ? Probably the IAC valve if that works
      1999 Powerquest 260 legend
      502 mpi
      B1

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      • #4
        welcome aboard.

        Which seat arrangement / engine compartment config do you have on your 190? i have heard of issue with the small dog house and rear jump seat arrangement with vapor lock. are you running the blower constantly?

        need pics of the boat..... just because we like pics
        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 - "Cheeseheads in Paradise"
        1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

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

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        • #5
          So went out today ran for an hour stopped for 10 min and boat started fine ran for 30 min and stopped for an hour and wouldn't start. I used starting fluid and motor would fire and run as long as I sprayed starting fluid in carb but wouldn't stay running. Guess that rules out electric problems because there is spark so back to vapor lock as possible problem? Thoughts? Please and thankyou

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          • #6
            Scott danforth

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            • #7
              Also not sure if it matters but when I put fuel in boat once it's full I get lots of fuel shooting out of fuel port. Vent problem maybe?

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              • #8
                Does this engine have the cool fuel system ? Vapour lock is a candidate.

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                • #9
                  Do you have TBI or MPI motor?
                  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
                  G-Dad always said "First Liar doesn't stand a chance"

                  Comment


                  • #10
                    Not sure what a cool fuel system or RBI or moi motor is it's mercury 4.3 v6 efi. How do you fix a vapor lock?

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                    • #11
                      I'm going to assume its a TBI, and as mentioned above the real fix is to run the return line back to the tank. This can be done at the fill hose. From what I'm reading you may not be handy with the do it your self stuff, but if you can find some one that is to help.

                      The pic below is for an MPI (Multi Port Injection) and I think you probably have TBI (Throttle Body Injection) and both would use cool fuel. The cool fuel module is on the port side of the motor below the motor mount.

                      Click image for larger version

Name:	Vapor Lock Fix.jpg
Views:	3
Size:	75.7 KB
ID:	10496754
                      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
                      G-Dad always said "First Liar doesn't stand a chance"

                      Comment


                      • #12
                        As above. AD as per usual has great advice...

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                        • #13
                          Sign up today
                          Alldodge thanks for info. Your correct rerouting fuel line is a bit above my ability. Looks like I'm headed to dealer. I'll pass your info along to them
                          Thanks again

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