GT-40 hard start
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=50482
Printed Date: April-23-2024 at 8:41am
Topic: GT-40 hard start
Posted By: wetskier2000
Subject: GT-40 hard start
Date Posted: February-19-2022 at 10:37am
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Seemed to begin hard starting when the engine had been run and allowed to cool down for 15 minutes or so. I could start it by giving it considerable throttle. Now this has progressed to cold starts as well. Put in plugs, cap and rotor cuz they showed some wear/age. Didn't change it at all. Old plugs tell me fuel damp (not quite soaked) on the starboard side and 1 oil soaked on rearmost cylinder on the port side. Although, it's not really oil soaked on the portion in the cylinder, more on the exterior of the plug, but no obvious runny oil signs on the motor... Not sure how this is happening... Anyway, I suspect my main problem might be the fuel soaked plugs.... Injectors were rebuilt a couple years ago. Fuel management problem? ------------- Current: 1997 Nautique Previous: 1987 Nautique 1964 American Skier |
Replies:
Posted By: JoeinNY
Date Posted: February-19-2022 at 11:16am
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Injectors are still the likely culprit- can’t imagine what constituted a rebuild - but unlikely they are being driven open - more likely they are just dripping ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1477 - 1983 Ski Nautique 2001 1967 Mustang 302 "Decoy" http://www.youtube.com/watch?v=cO5MkcBXBBs - Holeshot Video |
Posted By: KENO
Date Posted: February-19-2022 at 12:35pm
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Click on the link below for some reading. He swapped lots of parts and when there was pretty much nothing left to do, he changed the injectors.............then he was happy  Fuel pressure regulator may be worth considering as a start, since it's cheaper and easier, but like Joe said, something's probably dripping/leaking http://www.correctcraftfan.com/forum/forum_posts.asp?TID=48524&KW=&title=gt40-takes-longer-to-start-when-warm" rel="nofollow - link
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Posted By: wetskier2000
Date Posted: February-19-2022 at 5:55pm
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Here's the guy that serviced them... You guys could be completely correct.... afterall, they are 25 years old now and certainly don't owe me anything... https://hurstinjectorservice.com/ ------------- Current: 1997 Nautique Previous: 1987 Nautique 1964 American Skier |
Posted By: wetskier2000
Date Posted: February-22-2022 at 8:10am
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A quick search on NautiqueParts doesn't show injectors... Are they available? ------------- Current: 1997 Nautique Previous: 1987 Nautique 1964 American Skier |
Posted By: Gary S
Date Posted: February-22-2022 at 8:32am
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You won't be able to afford any of those from a dealer- PCM is very proud of them. What you need are 24 pound injectors something like these- https://lmr.com/item/M9593LU24A-K/Mustang-Ford-Racing-24lb-Fuel-Injector-Kit-w-Adapters-86-04 they also come with the adapters you will need since the original connectors have been superseded. You can also do a google search for Ford 24# injectors look for the purple bodied ones ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: Gary S
Date Posted: February-22-2022 at 8:35am
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Here is Nautique Parts listing- https://www.nautiqueparts.com/product/fuel-injector/ notice the price 223.55- that is each ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: wetskier2000
Date Posted: March-20-2022 at 8:14am
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Anyone installed these on a GT-40? I'd sure like the be somewhat confident the parts fit before ordering them.... https://lmr.com/item/M9593LU24A-K/Mustang-Ford-Racing-24lb-Fuel-Injector-Kit-w-Adapters-86-04 thanks
------------- Current: 1997 Nautique Previous: 1987 Nautique 1964 American Skier |
Posted By: KENO
Date Posted: March-20-2022 at 3:31pm
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You can be about 101% confident
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Posted By: wetskier2000
Date Posted: March-22-2022 at 8:21am
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I ordered them up and will report back... thanks ------------- Current: 1997 Nautique Previous: 1987 Nautique 1964 American Skier |
Posted By: wetskier2000
Date Posted: April-26-2022 at 4:18pm
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The purple injectors are installed... I had to run the wires up over the fuel rails to accommodate the plug adapters, but no big deal (I hope). Before the wires were under the rails... Also should have listened to myself and used a little grease on the orings instead of the internet guy that used gasoline.. I tried using 93 Octane and it didn't work worth a crap... back to my method of a little grease and they slipped into the intake like a teenager into a cougar. Haven't run it yet but will yard test for leaks, get it into the river and try it out then report back... thank again thus far guys.... ------------- Current: 1997 Nautique Previous: 1987 Nautique 1964 American Skier |
Posted By: KENO
Date Posted: April-27-2022 at 7:59am
Might need a picture of this, maybe several |
wetskier2000 wrote:Posted By: wetskier2000
Date Posted: May-01-2022 at 6:50pm
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Early signs are positive... We'll see what the next couple of weeks brings... ------------- Current: 1997 Nautique Previous: 1987 Nautique 1964 American Skier |
Posted By: wetskier2000
Date Posted: May-06-2022 at 8:20am
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Evaluations of the new injectors may come in slowly... My wife broke her toe shoving it into her binding over the weekend... She's on injured reserve for a few weeks (... and less than happy about it)...
------------- Current: 1997 Nautique Previous: 1987 Nautique 1964 American Skier |
Posted By: gun-driver
Date Posted: May-06-2022 at 7:21pm
Sounds like you have a designated driver now.
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Posted By: wetskier2000
Date Posted: July-12-2022 at 8:17am
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Pretty confident the new injectors have solved the hot start problem that also became a cold start issue... No signs at all of this symptom returning. I also pulled the plugs yesterday and every one looked fine. .... and the wife's toe is all healed up and she's skiing again... Happy wife.... well, you know... thanks for all the help on this!!! Next up, occasional crappy idle that wants to stall usually when the skier just said "hit it".... IAC??
------------- Current: 1997 Nautique Previous: 1987 Nautique 1964 American Skier |
Posted By: wetskier2000
Date Posted: August-10-2022 at 4:52pm
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IAC seems to have fixed the crappy idle... All is well now... thanks for all the help once again, guys! ------------- Current: 1997 Nautique Previous: 1987 Nautique 1964 American Skier |
Posted By: gun-driver
Date Posted: August-10-2022 at 5:36pm
Good deal,
 thanks for the follow up. |
Posted By: wetskier2000
Date Posted: August-29-2022 at 8:51am
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... I'd say our 1997 GT-40 is at about 90-95% right now... crappy idle is fixed, hard start is fixed... really running pretty much new... Only remaining issue is that it's slightly harder to start than it used to be.. It's barely worth mentioning, really... But I think it cranks just a tiny, little bit more than it used to when new before it starts. I've had a fuel pressure gauge on it in the past and it always read withing spec, but I gotta wonder if the pair of 25 year old pumps with 1700 hours should just be replaced anyway...... ------------- Current: 1997 Nautique Previous: 1987 Nautique 1964 American Skier |
Posted By: MrMcD
Date Posted: August-29-2022 at 3:18pm
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Easy test, turn the key on to the run position to prime the pumps, turn key off, turn key on once again right away and start the engine. Did it start better? If that fixes the slow start issue you are correct, your pumps are taking a little longer to pressurize or maybe your pressure regulator is leaking. 1700 hours is very good you must have been doing good maintenance over this long life. Glad to hear you won the battle. ------------- |
Posted By: wetskier2000
Date Posted: October-09-2022 at 7:41am
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.... sorry for the misstep putting this in another thread... I've never been accused of being the brightest bulb on the tree.,,, So if I have a steady idle with the regulator disconnected, it's the pumps? Are the pumps available? Will I need to refi my house?
------------- Current: 1997 Nautique Previous: 1987 Nautique 1964 American Skier |
Posted By: KENO
Date Posted: October-09-2022 at 11:48am
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If pressure is fluctuating with the regulator disconnected, the only thing that will make it do that is changing pump pressure. Engine vacuum won't make the regulator change positions. If it's steady, then the pumps would seem to be doing their job. How's it run at speeds other than idle? If it runs good with no issues, then the pumps must be delivering fuel like they should. Replacements for both pumps are reasonable pricewise, to answer your other question. Discount Inboard Marine prices add up to 250 for both.
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Posted By: wetskier2000
Date Posted: November-07-2022 at 11:14am
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Ok, back on this... The idle with the fuel pressure regulator disconnected seemed improved... I ordered the regulator and both pumps anyway... Replaced the regulator... first key on gives 31 psi, second one (without starting) gives 41 psi... I suspect with these symptoms that I have BOTH a fuel pump and regulator issue. I will replace both of my 25 year old pumps. The one on the block (low pressure?) does not have a plug like the new replacement does. It appears to be just wired into the harness. There do not appear to be any markings on the new one for + or -.... Both wires on the new one are black... Old one had green/striper and black... How the heck do I wire this correctly? ------------- Current: 1997 Nautique Previous: 1987 Nautique 1964 American Skier |
Posted By: KENO
Date Posted: November-07-2022 at 12:29pm
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Old one.............green striped wire is positive, black is ground. New one...........how about a picture looking straight down on the connections, along with brand and model number. Or compare it to this picture I took of a P4594 Carter pump, the terminal on the top has a teeny, tiny little (+) next to it and the other one has a( - ) symbol next to it. Pretty sure a P4389 is the same orientation but didn't have one close by to take a picture of. You may have to look closely to see the symbols. That should maybe help take some of the mystery out of the job  |
Posted By: wetskier2000
Date Posted: November-07-2022 at 12:35pm
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Sure enough!!! There is a teeny + and - I had not seen before... thanks!!! ------------- Current: 1997 Nautique Previous: 1987 Nautique 1964 American Skier |
Posted By: KENO
Date Posted: November-07-2022 at 12:40pm
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Posted By: MrMcD
Date Posted: November-08-2022 at 2:29pm
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Nice work once again Ken. You are correct that family of Carter pumps use the same connector and they have that small + and - ------------- |
Posted By: wetskier2000
Date Posted: November-12-2022 at 8:09am
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baby steps... Got the regulator in and the WX was too nice to continue on to the pumps and not ski... launched the boat and got in our last runs until FL in Feb. Then I pulled the boat and pickled it. I think the occasional crappy idle is gone, but time will tell. Its fooled me before.. I'm a little torn on installing the pumps now especially since the first test will be 1600 miles away in Feb... I thought about just taking them with us but installing them w/o my garage might not be the best idea either... ------------- Current: 1997 Nautique Previous: 1987 Nautique 1964 American Skier |
Posted By: KENO
Date Posted: November-12-2022 at 12:06pm
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I think I'd run the boat as it is now on your vacation since you know it runs and does everything OK except maybe the idle issue might or might not be cured New pumps followed by first real water tests on vacation might make for a bad vacation
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