Starts and then cuts out
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=49820
Printed Date: July-15-2024 at 2:34am
Topic: Starts and then cuts out
Posted By: BaccoBouncer
Subject: Starts and then cuts out
Date Posted: May-17-2021 at 12:22pm
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I have a '97 Sport Nautique with the PCM (chevy 350) It originally had the EFI but two years ago I swapped it for a Holley carb, mechanical fuel pump, and distributor with a built in coil. I took it back to basics as much as possible without having it pulled by a horse from the shore. It had worked great over the last two years. Unwrapped it and prepping before launch this past weekend. It started right up ran for 20 seconds and then died. if I give it a few minutes to rest I can get it going again, runs for 20 second (even at 3500 RPM) and then dies like you are cutting the throttle. Ideas? Diagnostic tips? If it is fuel (first guess) I was thinking of taking a spray bottle of gas and hand spraying into the carb as it dies to see if it keeps going. i.e. confirming fuel is the issue Could it be that it is using up what is in the bowl and the pump is too slow to keep up with it once that is gone? Could a fuel filter clog over the winter? Are there any common issues with water trapped in the fuel system and then freezing and breaking something like a pump diaphram? I did put Stabil in it before winterizing and I did sea foam the intake until it stalled out to protect inner surfaces. Could it be an ignition thing? Are there ignition issues that would work fine for 20 seconds and then cut out? Thanks, Adam ------------- '97 21' Sport Nautique |
Replies:
Posted By: Jonny Quest
Date Posted: May-17-2021 at 4:41pm
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Adam. The spray bottle method can help you determine if there is a fuel delivery problem. I’ve done this several times with good success. Just be safe and keep an extinguisher handy just in case. If it is fuel related, I would look at: - debris in fuel lines and/or tank - fuel water separator - fuel pump - carb float bowl issues JQ ------------- Current 2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
Posted By: KENO
Date Posted: May-17-2021 at 6:11pm
| After it quits, besides turning the key, what do you have to do to get the engine running again? |
Posted By: BaccoBouncer
Date Posted: May-17-2021 at 10:54pm
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It looks like it was a stuck float. I took the line off the mech pump and it was working fine. I took the line off of the carb and sprayed a bunch of carb cleaner into the bowls. Let it sit for a while. Then hooked it all back up and got it running. It idled fine. I think that even though I put Stabile in there I need to run more with that last tank. I will look to see if I can drain the carb as well at the end of the season. Now that some carb cleaner and a bunch fo starter fluid has gone through the system what would you advise as far as protecting the cylinders or should I not worry about it and just run it a bunch? I guess I am asking if I should fog it to get a good oil coat on there. Thanks for the help and input! ------------- '97 21' Sport Nautique |
Posted By: KENO
Date Posted: May-18-2021 at 5:03am
Everything you sprayed in there is long gone. it's been vaporized, combusted, vanished, don't worry about it. 
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Posted By: SNobsessed
Date Posted: May-18-2021 at 8:24am
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My experience is that if the float sticks, the carb is gummy in other ways too. So long term, taking bowls off & giving it a good scrub may be worth the effort. ------------- “Beer is proof that God loves us and wants us to be happy.” Ben Franklin |
Posted By: BaccoBouncer
Date Posted: May-18-2021 at 11:29am
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ok. I also am going to look to see if it has a drain. I could empty it when putting it away. When you change the oil do you pump it out or run the hose through the hull to a pan? How do you remove the filter without spilling oil in the hull? Thanks everyone for the quick response. You guys are the best. ------------- '97 21' Sport Nautique |
Posted By: KENO
Date Posted: May-18-2021 at 1:01pm
If you want to drain the carburetor bowls pull out one of the lower bowl machine screws/bolts with a little container underneath to catch the gas. One on the front and one on the back If you're gonna pull the bowls to check and clean them, then you might as well pull the carburetor and clean the rest of it too, since all those tiny little passages will clog up and get cruddy too if the bowls are getting cruddy and the floats are sticking Then you might as well have a rebuild kit so you have any extra parts/gaskets since you'll tear/lose the wrong part at just the wrong time Bags and rags and towels and a little creativity work pretty good for the oil filter removal Either way works to drain the oil, unless you don't have a pump
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BaccoBouncer wrote:Posted By: Jonny Quest
Date Posted: May-18-2021 at 11:16pm
I run the oil drain hose through the drain plug in front of the engine. I let the hose dangle into a 2 gallon used oil container. Warm up the engine first as the oil will flow better. If you want to drain cold oil, let the oil drain for several hours or overnight. It can be difficult to remove the oil filter on a SBF without spilling a bit. I always place a couple of shop towels under the filter to catch any spills / drips. I keep the towels in place for the filter re-installation as I like to install the new oil filter that has been pre-loaded with with oil to help get the oil pressure up quickly on re-start. I usually fill the filter to about 3/4 full with oil. JQ ------------- Current 2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
Posted By: KENO
Date Posted: May-19-2021 at 6:43am
I'm not too sure Bacco really cares about changing the oil filter on a SBF 
See post #1 sentence #1 for the brand of his engine.
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Posted By: BaccoBouncer
Date Posted: May-19-2021 at 9:25am
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What is a good additive to run int the fuel to help clean the carb during the season? Sea Foam? Marvel Mystery Oil? What is an SBF? ------------- '97 21' Sport Nautique |
Posted By: 8122pbrainard
Date Posted: May-19-2021 at 10:40am
I run ethanol. SBF: "small block Ford" ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |