Partner shut off key on overnight run now engine won't run... - Page 3 - SailNet Community
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post #21 of 53 Old 08-27-2014
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Re: Partner shut off key on overnight run now engine won't run...

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Originally Posted by JRickW View Post

Here is what I will try this weekend:
1) Pull the alternator belt
2) Purchase a new electric fuel pump and rig it to pump from a clean can of diesel directly into the injector pump. That way, I bypass the filters and all lines up to the injector pump.

How does that sound? Any other experiments to narrow it down?
Definitely worth a try. But if the problem is damage to the HP fuel pump I would expect the problem to be too little fuel, but your description suggests too much fuel/bad burn.

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post #22 of 53 Old 08-27-2014
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Re: Partner shut off key on overnight run now engine won't run...

Air entry in fuel pickup system? No cracks, loose clamps, fossilized gaskets? Can you see small air bubbles being sucked into the fuel filter?

Does fuel system require a re-bleed after 30 seconds of running? Does any air come out of fuel system after it shuts down?

Had similar symptoms from a JD powered tow-behind air compressor. Could see air bubbles filling up filter, and it died after a very short run. Would restart, but sucked air back into system. Repeat until batt dies. Fixed by brazing crack closed in pickup tube.
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post #23 of 53 Old 08-27-2014
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Re: Partner shut off key on overnight run now engine won't run...

BTW - shut your raw water inlet valve while doing all these engine start/die cycles
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post #24 of 53 Old 08-27-2014
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Re: Partner shut off key on overnight run now engine won't run...

Dumb question maybe, but why does the boat have an electric fuel pump? the YSB engines all have mechanical pumps. If the boat ran for 6 hours with the key off, I will assume that the pump is not wired through the switch. Is the pump currently working?

It's 5 o'clock somewhere:


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post #25 of 53 Old 08-27-2014
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JRickW I agree with your plan.

I understand you only have soot coming out in the exhaust water and not black or blue smoke? The soot is probably just being washed out of the exhaust system and is inconsequential.

If you don't have dark smoke the engine is not overloaded so I come back to being starved for fuel. As Faster says we can't tell a good injector by observation (but sometimes a really bad one). I would pick up a new one for your next troubleshooting session too.

Good luck.
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Re: Partner shut off key on overnight run now engine won't run...

There is definitely NO smoke. Only the soot in the water.

It literally sounds (the engine noise) like fuel starvation to me as well. The engine does not react to the throttle and just sort of peters out as if I pulled the throttle to shut it off. I will do the experiments and double check for air in the fuel.

Thanks again.
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post #27 of 53 Old 08-27-2014
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I also have a ysb12 and it has an electric fuel pump. I would re bleed the system all the way to the injector and do it again if it stalled after starting. We're your battery(ies) dead after you discovered the key was in the off position?
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post #28 of 53 Old 08-28-2014
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This is a stretch but the throttle cable is not doing something goofy is it?
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post #29 of 53 Old 08-28-2014
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Re: Partner shut off key on overnight run now engine won't run...

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Originally Posted by JRickW View Post
I'm not sure I would bet it is the injector (it may be) ......
It's your boat, place whatever bet you like. I see you're not fessing up to the last cleaning, however.

Do you religiously use biocide in your fuel or purchase fuel with it? Nasties could be inside your injector.


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post #30 of 53 Old 08-28-2014 Thread Starter
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Re: Partner shut off key on overnight run now engine won't run...

I am very confident there is nothing inside the injector, it was stripped and cleaned. What I don't know about the injector is the pop pressure and volume.

The fuel has all been replaced.

It is possible that something is going on with the throttle/governor. I will look into it a bit more.

Yes the batteries were dead after the run. That's because when the key is off, there is no field current to the alternator so it doesn't produce any voltage. The other thing with the key off is the electric fuel pump doesn't work. My engine doesn't seem to have a mechanical lift pump.
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