Baller Up North Posted June 29, 2017 Baller Share Posted June 29, 2017 Hi everyone, After doing some troubleshooting on a friends boat, we have determined that the computer needs to be repaired or replaced, and have not gotten anywhere in finding a solution. The problem is that the relay associated with the fuel pumps (second one in the circuit) is not energizing for the brief period after turning the key on, like it is supposed to. It seems like the input to the computer is supposed to create a briefly held ground path for the relay to be turned on, but isn't. I have verified this operation on my boat with the same engine, and after installing my boats computer in his boat, his runs great. Long story short, I have not researched this a lot yet, but he has called everyone from a Correct Craft dealer, PCM, Discount Inboard Marine, and a couple ECM repair places he found on the internet and hasn't gotten anywhere. The story he is being told is that they do not make these any longer, and has not found anyone who can help him out or point him to a solution. Because there are a lot of these boats still in service and running strong, I have to believe someone has a solution for this, and thank you in advance for your feedback. Have a great day! Kent Link to comment Share on other sites More sharing options...
Baller Andre Posted June 29, 2017 Baller Share Posted June 29, 2017 To help others help you,you way want to post year of the engine and a pix of the ECM serial and model numbers. Good luck! Have you tried with @Jody_Seal and Indboard sulutions (not sure of the name ) ? My ski finish in 16.95 but my ass is out of tolerance! Link to comment Share on other sites More sharing options...
Baller whitecaps Posted June 29, 2017 Baller Share Posted June 29, 2017 Check Plantetnautique. There is a thread on there about programming a different ECM to be used on the GT-40. It has been done with success. Hope I don't need to deal with it personally but I do know you aren't the only one that's gone down this path. Link to comment Share on other sites More sharing options...
Baller JayG80 Posted June 29, 2017 Baller Share Posted June 29, 2017 ECM on PN Link to comment Share on other sites More sharing options...
Baller rockdog Posted June 30, 2017 Baller Share Posted June 30, 2017 Correctcraftfan likely also will have a thread related. Link to comment Share on other sites More sharing options...
Baller A_B Posted June 30, 2017 Baller Share Posted June 30, 2017 I went through the same thing with my ECM. Ended up getting a new one. There is a rebuild place online, but at that point, I was tired of chasing the issue and just popped for a new one. Possible Rebuilder Link to comment Share on other sites More sharing options...
Baller_ Jody_Seal Posted June 30, 2017 Baller_ Share Posted June 30, 2017 I have one, but it ain't cheap!! $1500 300-M Link to comment Share on other sites More sharing options...
Baller Orlando76 Posted June 30, 2017 Baller Share Posted June 30, 2017 Seems like there's two choices: Jody Seal, or swap over to a carb. I can't necessarily say I'd switch to a carb quite so soon unless there's other issues. But a properly tuned carb is flawless. Link to comment Share on other sites More sharing options...
Baller JC McCavit Posted June 30, 2017 Baller Share Posted June 30, 2017 @Jody_Seal - How many years did PCM build the GT-40? Is the 300-M new or used? Can you get more when you sell the one you have? Link to comment Share on other sites More sharing options...
Baller_ Jody_Seal Posted June 30, 2017 Baller_ Share Posted June 30, 2017 @JC McCavit I stumble across GT engine's all the time currently I am in possession of three ECM's however only one of them is a 300-M and one of the others has hot soak issues (wont run the pumps after it reaches a certain temp). None are new, even PCM has only one on the shelf for diagnostic purposes. Gt-40 years roughly 1995-2002. Another place to look is Volvo Penta as they also utilized the same ECM. The common failure in these are the fuel pump drivers. Link to comment Share on other sites More sharing options...
Baller JC McCavit Posted June 30, 2017 Baller Share Posted June 30, 2017 @Jody_Seal - Thank you for the information. I wish PCM would make some more, it's hard to see how it wouldn't be profitable with so many of the GT-40 engines in use. Link to comment Share on other sites More sharing options...
Baller oldjeep Posted June 30, 2017 Baller Share Posted June 30, 2017 Choice 3 might be an aftermarket injection kit. About the same price as Jody's ECM but at least there will be longer term parts support affordable-fuel-injection.com ford-marine Link to comment Share on other sites More sharing options...
Baller_ Jody_Seal Posted June 30, 2017 Baller_ Share Posted June 30, 2017 @oldjeep A lot more to it then just installing that kit: replace intake manifold also another $250, gaskets $50. and if ya are not in possession of the correct squeezers and twisters or don't know how they work then it becomes more of a $2500-$3000 job if it rolls into a shop for the conversion. Also have had some experiance with these aftermarket EFI systems. they are ok in a vehicle but the fiddle factor in a marine application especially for a ski boat becomes very apparent. but if that is all one has to do and it is a hobby then by all means let rip Taterchip!!! All of a sudden that $1500 ECM looks good especially when in less then 5 min it can be changed out!! Link to comment Share on other sites More sharing options...
Baller eleeski Posted June 30, 2017 Baller Share Posted June 30, 2017 I've put aftermarket electric fuel pumps in cars. I wonder if you could replace just the fuel pump? Link to comment Share on other sites More sharing options...
Baller Andre Posted June 30, 2017 Baller Share Posted June 30, 2017 If it's indeed the fuel pump driver all the fuel pump need is another source of 12 volts to run.There is a way to fix that for someone with a bit of mechanical/electrical knowledge But i would try to get in touch with the guy from the planet nautique thread linked before. That would be my first choice. 1500$ US is a lot of cash for me... My ski finish in 16.95 but my ass is out of tolerance! Link to comment Share on other sites More sharing options...
Baller DanE Posted June 30, 2017 Baller Share Posted June 30, 2017 Beware of scrapping the ECM just because the fuel pumps don't run. If the symptom is that they won't run unless you are cranking the starter there is a diode hidden in the harness that can break and cause this. Study the wiring diagram and rule this out. Link to comment Share on other sites More sharing options...
Baller Up North Posted July 21, 2017 Author Baller Share Posted July 21, 2017 The fuel pump relay is energized for a few seconds when you turn the key (at least it is supposed to). The relay is turned on by a ground being created in the ECM that temporarily energizes that relay which in turn energizes the pumps. I am not sure if that same ground is created once the engine starts or if there is another means that powers the pumps at that point. If it is just needed when the key is turned initially, a switch could be installed that would need to be manually be turned on and off again, but I am guessing that same circuit is used once the engine starts and would need to be shut off to stop flowing fuel to the engine in a normal or emergency shutdown. Anyway, it is this circuit in the ECM that is the issue Link to comment Share on other sites More sharing options...
Baller thager Posted July 22, 2017 Baller Share Posted July 22, 2017 I had a similar problem this spring with the Excaliber engine. Energize system but no fuel pump pressurization whine noise. Crank the engine all you want but no start. Problem for me was bad connection on back of kill switch. Wire spade connection to post was not tight and had a little corrosion on it, Link to comment Share on other sites More sharing options...
Baller A_B Posted July 23, 2017 Baller Share Posted July 23, 2017 Don't rack your brains on this like I did. Throw a fuel pump gauge on the rail and if the pump fluctuates it is the ECM having a brain fart. Mine would hold pressure and then fluctuate and the engine would sputter. I replaced the pumps, relays, and something else. Jody is right on as usual. Link to comment Share on other sites More sharing options...
Baller_ DW Posted July 24, 2017 Baller_ Share Posted July 24, 2017 @Mark_Matis : How do you like the AFI system? Pros / cons (performance / fuel economy)? Any issues? Thx. Link to comment Share on other sites More sharing options...
Baller Up North Posted December 1, 2017 Author Baller Share Posted December 1, 2017 After continuing to look for a company to repair my ski partners PCM GT-40 ECM, we found a company in Arvada Colorado (ECU Repair Now) http://www.ecurepairnow.com/ that was willing to take a look at it for us. It took them about a month and they ended up having to order some parts and do some research but were able to get us back on the water for around $500. We received it back from them this fall (just before taking the boat out for the season), and it seemed to work like new. Thank you ECU Repair Now!!!!! Link to comment Share on other sites More sharing options...
Baller Andre Posted December 1, 2017 Baller Share Posted December 1, 2017 Congrats on saving 1k ! That's a lot of ski rides! My ski finish in 16.95 but my ass is out of tolerance! Link to comment Share on other sites More sharing options...
shansen345 Posted December 1, 2017 Share Posted December 1, 2017 There are many shops out there that will program EFI systems to run on standalone aftermarket ECUs. I have a hard time believing that a reputable tuning or speed shop could not make someone a new ECU for their GT40. I am hoping to buy a GT40 boat within the next few years, so I appreciate you sharing your positive result with us. Glad it worked out for you. Link to comment Share on other sites More sharing options...
Baller JC McCavit Posted December 1, 2017 Baller Share Posted December 1, 2017 @Up North -What year is your friends GT-40, do you know if your friends ECU is a 300-M or the older version? I have a 1997 with the older ECU and would like to have it upgraded to the specs of a 300-M ECU. Link to comment Share on other sites More sharing options...
Mike9812121298 Posted October 19, 2018 Share Posted October 19, 2018 Just throwing it out there for anyone looking for a gt40 ecu, check out gt40ecu.com last I checked they have some in stock Link to comment Share on other sites More sharing options...
Baller JC McCavit Posted October 19, 2018 Baller Share Posted October 19, 2018 I am not a able to view the products area, something about not having a valid security certificate. Link to comment Share on other sites More sharing options...
Mike9812121298 Posted October 20, 2018 Share Posted October 20, 2018 take a look now I added a buy it now button on the home page. I'll have to look into the security certificate issue, i haven't seen that on my end Link to comment Share on other sites More sharing options...
Baller JC McCavit Posted October 21, 2018 Baller Share Posted October 21, 2018 @Mike9812121298 - are the ECMs the 300-M version? The products tab on your website is working now. Link to comment Share on other sites More sharing options...
Mike9812121298 Posted October 24, 2018 Share Posted October 24, 2018 Yes there uploaded with the most up to date firmware. 300-M Please let me know if you find anything else about the site. Still trying to work out the kinks Link to comment Share on other sites More sharing options...
johnsugar Posted November 13, 2021 Share Posted November 13, 2021 For anyone just finding this thread and new to the ECM issue like me, there are two avenues to fix it. See the thread on PlanetNautique. https://www.planetnautique.com/vb5/forum/nautique-topics/maintenance-technical-discussion/510361-hope-for-gt40-efi-ecu Link to comment Share on other sites More sharing options...
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