Boat will not idle when warm; will not start immediately after stopping

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tprout

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Jul 29, 2011
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I apologize - I rushed and posted this in the outboard forums . . .

Hello all,

I'm new to the forums and I read the 'How to Ask a Question' thread, so hopefully I will not frustrate anyone.

I recently purchased a 2002 Bayliner 195 Capri Sport with a Mercruiser 4.3L and an Alpha One outdrive from a gentleman that had around 93 hours on it (original owner). He indicated that he 'babied' the boat and always properly winterized the boat, etc.

We started it in the driveway with muffs on when I first looked at the boat, and I met the seller the next day for a test run, boat started right up ran super for 30 minutes and I was sold.

Excited; the family and I took her out to the lake that weekend for some fun . . the boat started right up, we left the dock area and proceeded to tour around the lake for 30-40 minutes. At this point, we decided to stop and try some tubing for the kids, so I pull out of the middle and turn off the engine so we can safely proceed . . .

Well, the boat will not start at all - 3, 10(ish)-second periods of cranking (yes; the engine turns over but will not start), and I wait approximately five minutes and try again - no dice.

We dropped our anchor and waited around 30 or so minutes. At this time, the engine does start, but it is very rough - I jiggle the throttle back and forth a little and coax the engine back up over 1000 RPM and then the boat runs like a champ again . . . we tool around the lake for another hour or so, low speed (1200 RPM-ish), and higher speed (3800 RPM) . . .no hesitation, no anything - the boat runs smoothly without a hitch.

We stopped and anchored for lunch and to let the kids swim a bit, so we had a 45 minute stop. Again - the boat started, but idled roughly and I need to throttle up and back a bit to coax her up above 1000 RPM and all is well.

We decide to play it safe and head back to the dock so we can go ahead and leave - while pulling in and waiting for a mooring, I pull the boat to neutral and the engine idles for 10 seconds before sputtering and dying - I cannot restart the engine. Luckily a fellow boater had just trailered his boat and offered to help us out.

Needless to say, I am a bit flustered . . . the boat idles when its cool (waiting for me to come back down to the slip after I drive the trailer to park it, but it will not idle hot.

It runs superbly (as far as I can tell) when I throttle up and back, but at idle, when warm/hot it will not stay running. Additionally, if I kill the engine its at least a thirty minute wait before I am starting it again.

ANy help would be appreciated - the fellow I bought the boat from, stabilized the gas over the winter, and there was about 10 gallons of the older gas in it, which I put 20 gallons of fresh gas on top of it.

The kids are itching to try the tube/skis, and I don't want to be towed to dock if I can help it!

Thank you,

Tim
 

grendelsniper

Petty Officer 3rd Class
Joined
Jul 18, 2011
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84
Re: Boat will not idle when warm; will not start immediately after stopping

sounds to me like a carbed motor not fuel injected right? is this a mercruiser tks,(turn key start) cause it sounds like a carburator issue or vapor lock, carb might need to be rebuilt, or fuel pump prob, just my 2 cents, hopefully someone else will chime in
 

tprout

Cadet
Joined
Jul 29, 2011
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Re: Boat will not idle when warm; will not start immediately after stopping

Yes sir - carbed engine, turn key start . . .
 

Mahoney

Chief Petty Officer
Joined
Aug 2, 2004
Messages
537
Re: Boat will not idle when warm; will not start immediately after stopping

It definitely sounds like its getting heat soaked. One thing to try if you haven't already is to run your blower after shut down or if possible open the engine hatch and see if it restarts any better after hot. I have also read that sometimes after you shut down, your carb can slowly leak a tiny bit of fuel into the bowl after shutdown, so you can check that as well and see if its dripping any fuel after shutdown and if the carb throat has a "gas fog" in it.
 

EddiePetty

Lieutenant Junior Grade
Joined
Aug 25, 2008
Messages
1,008
Re: Boat will not idle when warm; will not start immediately after stopping

Tim,
With the engine RUNNING at/or near operating temperatures, (on muffs is acceptable) and the choke completely off, remove the flame arrestor and peer down the throat of the carb. See any LIQUID fuel dripping from the bolsters? Shut 'er down and very slowly open the throttle (to not pump the accelerator circuit) to full ahead...see any liquid fuel lying in the bottom of the intake?
Yes to either spells carb re-build time.
 

tprout

Cadet
Joined
Jul 29, 2011
Messages
6
Re: Boat will not idle when warm; will not start immediately after stopping

Thanks for the advice folks . . . I'll be going through the suggestions tomorrow - I appreciate all of your input!

:)
 

fishhunter911

Petty Officer 2nd Class
Joined
Sep 18, 2002
Messages
132
Re: Boat will not idle when warm; will not start immediately after stopping

tprout, Anything new to report on this? Cause found?
 

oops!

Supreme Mariner
Joined
Oct 18, 2007
Messages
12,932
Re: Boat will not idle when warm; will not start immediately after stopping

look at the clear tubing going to the carb....is there fuel running thru it?....if so its a bad fuel pump and you are flooding the motor.....BTDT
 

tprout

Cadet
Joined
Jul 29, 2011
Messages
6
Re: Boat will not idle when warm; will not start immediately after stopping

Actually, I could not get the boat to start with muffs on yesterday . . . I'm going to give it another try tomorrow afternoon - I'm about ready to just take her in for service.

:(
 

fishhunter911

Petty Officer 2nd Class
Joined
Sep 18, 2002
Messages
132
Re: Boat will not idle when warm; will not start immediately after stopping

I was having the same issue. Decided to rebuild the carb myself. Cost $65 in part and 2 hours of my time. She purrs like a kitten now. Very easy to do with basic hand tools. The 2 smaller venturi tubes had white deposits in them, causing them to be mostly clogged. I suspect this was the idling issue.
 

loav8r

Cadet
Joined
Apr 30, 2012
Messages
6
Re: Boat will not idle when warm; will not start immediately after stopping

I've been having the exact problem as the original poster except my engine is a 4.3L MPI. It's attached to a 2005 Sea Ray 2000. I'm wondering if it's suffering from a vapor lock? Does it need an electrical "fuel boost pump?" Anyone have the same experience with this engine not running with a carb?
 

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: Boat will not idle when warm; will not start immediately after stopping

Welcome to iboats loav8r
You need to start your own thread, not hijack an old tread of someone elses. http://forums.iboats.com/announcement.php?f=21



If you have questions for the OP, send him a PM, he has not returned to the forums since August 1's 2011
 
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