Long Running Stalling then No Start Issue - GT40

StevoDevo wrote: So here is the EEC connector I have - which of the connectors does the cable I'm going to make go into?

Picture?????

Any updates on a fix??

StevoDevo wrote: Should I buy a timing light? Thanks! Steve

Yes!

Heat soak problems hey Paul and Steve. Been there before myself they can be confusing.

Test for spark when the heat soak problem is there if spark is OK. Zone in on the fuel system pumps running, plenty of fuel pressure while cranking without start?

The fuel pump relay is activated by the ECM completing the circuit by supplying the ground (pin 52 on ECM connector). You can leave the STO jumpered to ground and the fuel pumps should run all the time. If intermittent you can leave this jumper in place and rule out problems with the ground supplied by ECM when it is in the heat soak condition.

There is one other possibility now in that if it has spark and fuel pressure but still will not start. It may not be getting the spark at the correct time or the injectors not firing properly. This could then be a ECM (Computer) heat soak problem.

You can test spark by getting tester like Brian said or in a pinch crank the engine and hold one plug anywhere to the metal one the engine . Crank and look for spark.

I have been fighting the same problem about stalling for a year. It finally stopped completely. I put in a new low pressure pump and it started in the driveway! Can't wait to get to the lake this weekend. I believe the problem has been solved.

Boat ran great this weekend. No stalling issues for the first time in a year. Appears the low pressure pump was going bad for a long time and finally died. Life seems much better when you can trust your boat!

Thanks' Jose (PT Skier) for your post as well. I've added both yours and Gary's to the GT40 thread.

I would run the blower frequently and leave the motorbox cover up to let it cool. When it did stall, I would pour lake water on the pump and it would decrease the time of the stall. Wish I would have changed the pump sooner. I believed it was vapor lock but it wasn't.

Actually, mine did not stall. It would run great until I stopped for an extended time. Then it would start and run about 100 yards and die. The pump is easy to install. Three screws on the top and reconnect the fuel lines. I used teflon tape on the fittings. If I can install it, anyone can!

Let me know how it works out

I don't have access to post pics at this time, however, I am sure someone will later. Looking at the front of the engine it is a small bowl that is suspended below the alternator belt pulley...that is the lower right hand side. It is a round cylinger about 6 inches long and attaches from the top with 3 small nuts. There is a electrical cable coming from it and the fuel line that goes up into the FCC. Hope this helps.

Very cool - thanks for the picture - definitely helps! So now I just need to work out the part number! Shouldn't be too hard I guess! Might make it part of my winter maintenance.

Thanks guys!

Just replaced mine after learning how to deal with it by holding the starter a little longer than just getting it going. 500 hours but 19 years....on the 1996'Super Sport. The position for repairing it is to climb in adjacent to the engine. Leaning over the back seat was not fun. Advice....take a few pics before starting so you can easily recall.whatmwent where.