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99 Nautique GT 40 Fuel Delivery issue high RPM |
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KENO 
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Joined: June-06-2004 Location: United States Status: Offline Points: 11112 |
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 Topic: 99 Nautique GT 40 Fuel Delivery issue high RPMPosted: August-26-2023 at 12:11pm |
You should do what he says  Fuel pressure at idle with high engine vacuum should be about 31 psi plus or minus a little and at full throttle Little to no vacuum) it should be about 39 plus or minus a little. Cruisin' around it'll be somewhere in between those numbers I'd hook it up and leave the engine box open so you can see the gauge and go for a ride. Same with an in line spark tester, hook it up to #5 if you have a helper to watch the spark tester. Should be able to see it pretty easily sitting in the observer seat
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bwinn
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Joined: July-13-2009 Location: ct Status: Offline Points: 396 |
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Posted: August-26-2023 at 8:19am |
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I think it would be helpful to check fuel pressure at the rail while the problem is occurring before you change any more parts. Do you have a fuel pressure gauge?
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Jonny Quest
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Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 2978 |
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Posted: August-25-2023 at 9:10pm |
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Inside the FCC (fuel control cell) there is a short rubber hose connected to the high-pressure fuel pump. These hoses can develop cracks and cause fuel delivery problems. Several threads on this site have discussed the hose cracking. SKIDIM sells a fix kit:
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2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
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jhenrichon
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Joined: August-20-2023 Location: Montana Status: Offline Points: 6 |
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Posted: August-25-2023 at 5:07pm |
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Thanks Keno. Yes I did typo and replaced the anti suction valve as well as new pick up line, both relays by the ecm and then both fuel pumps. Still having issues. Could it now be the injectors?
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KENO
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Posted: August-21-2023 at 7:28pm |
I don't know what a check cleave is, but what the hell, why not check it out I figure you typed check valve and got bit by autocorrect or something like that. The anti siphon valve that you already replaced is probably what that person was referring to. I'm not sure from your first post if you replaced the suction line in the tank or the suction hose for the LP pump, but the tank suction is a plastic line with a small strainer at the bottom that can get gunked up Back in the first post where you mention fuel modules, do you mean you replaced the 2 relays for the ECM and the fuel pumps?
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jhenrichon
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Posted: August-21-2023 at 7:10pm |
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Thanks JQ. Both are. I did replace the anti siphon and we tested the vent
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Jonny Quest
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Posted: August-21-2023 at 6:54pm |
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The fuel tank has an anti-siphon valve and a tank vent. Both must be operating properly for fuel to flow out of the tank. You really should verify that both are working properly in your trouble-shooting efforts.
JQ
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2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
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jhenrichon
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Posted: August-21-2023 at 5:54pm |
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Thanks guys for the input. Check engine light is operating. One person mentioned the check cleave in the tank. That make any sense to try next?
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Mpost
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Joined: July-05-2018 Location: Monticello, MN Status: Offline Points: 329 |
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Posted: August-21-2023 at 8:57am |
Does the check engine light come on when you turn on the key but dont try to start it? It should. If not your bulb may be burnt out or wire disconnected.
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84 SN Sold 98 SN Lund Pro V 1975 Alumacraft
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KENO
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Posted: August-20-2023 at 9:55pm |
So you think a gt40 will run on 2 cylinders? Come on now
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bwinn
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Posted: August-20-2023 at 7:26pm |
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You should be checking for fuel pressure or spark while it’s hard to start.
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jhenrichon
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Posted: August-20-2023 at 7:09pm |
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Thanks JQ. Haven’t seen the light come on. Also after boat stalls out from high rev cutting out is hard to start up again.
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Jonny Quest
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Posted: August-20-2023 at 6:15pm |
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Could be the ECM going into "limp mode". Have you noticed the red cyclops light between the speedos being illuminated? Limp mode happens when the ECM senses a high temp or low oil pressure event and shuts down all but 2 cylinders and allows you to "limp home". Usually, the engine won't turn over 2,000 RPMs in limp mode.
This thread deals with the red C-E-L light coming on: http://www.correctcraftfan.com/forum/forum_posts.asp?TID=51306&title=red-check-engine-light
JQ
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2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
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jhenrichon
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Posted: August-20-2023 at 2:39pm |
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Hi all. I have a 1999 sport Nautique with GT. The engine was having trouble at high rpm and shutting down over 20 MPH. I have tried the following in order to try and resolve the issue and still having problems. Any insight would be appreciated.
New fuel filter New spark plugs New fuel filter New fuel pick up Removed anti siphon valve New fuel modules New high pressure fuel pump New low pressure fuel pump New ignition module Drained fuel tank and filed new fuel |
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bwinn wrote: