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496 HO Hard to Start after sitting

Old 07-01-2018, 11:53 AM
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Default 496 HO Hard to Start after sitting

Hey guys,

One of my motors is giving me a hard time. Starts up initially fine, runs like a champ, and is not setting off any alarms on my vessel view. BUT, if I turn it off, to say anchor out or dock for a bit, and then go back to start it up it just cranks. If I crank it long enough (excessively) it will fire up. Yesterday it did sputter a pair of times before I finally got it cycled on. If I turn it off after a run, and then try to fire it back up after say 5 minutes, itís fine....but if we leave it for any longer period of time it just cranks.

Thoughts? Leaky injector causing it to flood after shut down? Bad coil? Something else?

Thanks in advance for the help!!
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Old 07-01-2018, 12:33 PM
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Sounds like vapor lock. What's your serial number?
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Old 07-03-2018, 02:44 PM
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If it's a Gen 3 cool fuel engine and has been operated in salt water the Fuel Service Module (FSM) cooling passages are probably restricted. The FSM becomes heat soaked and causes vapor lock. The fix is to replace the FSM housing. If it's a Gen 2 cool fuel engine the low pressure fuel pump is probably bad. Either way always leave the blower running and crack the hatch to let the hot air out.
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Old 07-03-2018, 03:42 PM
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I bet its the port engine........
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Old 06-14-2020, 01:07 PM
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Originally Posted by F-2 Speedy View Post
I bet its the port engine........
back at this issue again. Yes it is the port motor. Is this common?
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Old 03-26-2021, 11:22 AM
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Default Hard to start

I have exact same issue with both motors in fountain EC. Though it was vapor lock, but itís flooding. No cool can, big aeromotive fuel pumps with Whipples. After years of cranking, last year pulled fuel pump fuse and cranked a few seconds and started right up. Also replaced injectors, no difference.....

Did you ever figure out the root problem?
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Old 03-26-2021, 12:02 PM
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Originally Posted by AllDodge View Post
Sounds like vapor lock. What's your serial number?
Ive had 496's for 16 years in one boat or another. Is this a thing? Ive never heard of 496's vapor locking...


I would say have the injectors cleaned and fuel flushed out. Install another IAC. My IAC's use to give me problems upon start up every so often.

Last edited by Keith Atlanta; 03-26-2021 at 12:06 PM.
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Old 03-26-2021, 12:12 PM
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Originally Posted by joet13 View Post
I have exact same issue with both motors in fountain EC. Though it was vapor lock, but itís flooding. No cool can, big aeromotive fuel pumps with Whipples. After years of cranking, last year pulled fuel pump fuse and cranked a few seconds and started right up. Also replaced injectors, no difference.....

Did you ever figure out the root problem?
whats your fuel pressure, and what size whipples are you running
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Old 03-26-2021, 07:40 PM
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I'd check fuel pressure - auto zone will rent you a free tester. My starboard was giving me problems for 2 seasons. intermittent no starts. then worked fine. then no start. then fine. tried so many things. checked the fuel pressure of both - starboard was low. replaced the fuel pump, pain in the arse, but solved it right away.
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Old 04-07-2021, 04:14 PM
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Default 496 Hard Start

Originally Posted by F-2 Speedy View Post
whats your fuel pressure, and what size whipples are you running
W200ax 3.3l. Running at recommended fuel pressure (43psi at idle), TPS voltage correct, new IACís. New Injectors. New Plugs. Maybe Iíll replace wires, may be breaking down. Oh yea, new coils as well.
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