No start after boat has been running?

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smithrock

Petty Officer 1st Class
Joined
Jun 11, 2007
Messages
399
I have a Mercruiser 4.3L I'm having an issue with my boat not wanting to start after its been running for a while. It starts fine at first, but then after I've been running for a while and I go to re-start it doesn't want to unless I use the throttle only, but then as I go back into nuetral to engage the prop it dies? I had to turn the idle on the carb up to about 1300 to keep it from dying just so I could engage the prop to make it back to the launch ramp! Any ideas? :confused: No water in oil, engine was just rebuilt.
 
QC

QC

Supreme Mariner
Joined
Mar 22, 2005
Messages
22,783
Re: No start after boat has been running?

Engine/drive model? Age? History of this issue? All of that will help.
 
S

smithrock

Petty Officer 1st Class
Joined
Jun 11, 2007
Messages
399
Re: No start after boat has been running?

1985 Mercruiser (I believe the engine is a bit newer than an '85 though) Alpha 1 drive. Engine was just rebuilt a couple weeks ago- Runs fine except for this issue, with it not wanting to start and hold idle after an hour or more of use. after I turned up the idle to about 1300 I could get it into gear and get back. Actually had to get a jump start as I killed the battery trying to start it so much! (thanks to guy that helped me out on the water yesterday)!

I am having an issue with the remote control but thats for another thread!
 
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smithrock

Petty Officer 1st Class
Joined
Jun 11, 2007
Messages
399
Re: No start after boat has been running?

Any ideas on what could be the problem?
 
wellcraft-classic210

wellcraft-classic210

Master Chief Petty Officer
Joined
Sep 22, 2010
Messages
839
Re: No start after boat has been running?

Could be caused by low vacuum from a vacuum leak induced during the rebuild -- This can be monitiored with a vac gauge.

another possiblity-- Dirt in float bowl clogging idle passage inlets // once you hit 1300 rpms the fuel is delivered through the venturis in the carb which iis a different circuit. The dirt may move around when flow drops off to the idle circuit causing intermittent issues.
 
S

smithrock

Petty Officer 1st Class
Joined
Jun 11, 2007
Messages
399
Re: No start after boat has been running?

OK, I'll check the carb first. Thanks!
 
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