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One motor stalling at extended idle-fuel starvation....

 
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Reddog



Joined: 29 Sep 2015
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City/Region: Friday Harbor
State or Province: WA
C-Dory Year: 1985
PostPosted: Tue Aug 23, 2016 2:48 pm    Post subject: One motor stalling at extended idle-fuel starvation.... Reply with quote

OK, so as I continue to sort our new to us boat out, I have come to this situation:
2002 Tomcat with carbed Honda 90 HP Outboards. At extended idle times (something like over 3 mins., the port motor will start to stumble. If I go to squeeze the primer bulb, it is soft and after a few squeezes, it gets hard and the motor picks back up. The motors run fine at speed and do not falter.
I have replaced both primer bulbs with BRP units (correctly oriented regarding flow and upright attitude), tightened all hose clamps, checked all filters and associated lines.
It seems that I must be sucking air somewhere, but I'll be darned if I can find it or understand why this only happens at idle.
All suggestions greatly appreciated!

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ZoeB



Joined: 09 Aug 2013
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City/Region: Key West
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C-Dory Year: 2004
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Vessel Name: Zoe B
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PostPosted: Tue Aug 23, 2016 2:57 pm    Post subject: Reply with quote

Happened to me at idle and it was the fuel clip at the engine where suction was being lost. You must be leaking air somewhere. Have you thought about replacing all of the fuel hose? Given your fuel bulb is getting soft leaking air would seem to be the culprit, and replacing hose/or a thorough checking for leaks in hose and fuel filter would be the first place to look.

Possibly the fuel flow at higher RPMs is enough to counteract the suction loss.

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BrentB



Joined: 15 Jul 2006
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City/Region: Greenwood
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PostPosted: Tue Aug 23, 2016 3:42 pm    Post subject: Reply with quote

Do you have external fuel filters like Racor?

Fuel filter head in and out fittings need gas resistant sealant like Permantix. Maybe it is fuel filter gasket at the top and bottom or the O ring used if using a bowl at the bottom of filter. They changed O ring material and have new light color but that was a few yrs ago and maybe back to black.

on edit I agree with ZoeB
Check the clip.
I may have one or the hose goes directly to fuel filter under the cowling

Hard for a blind squirrel to find nuts

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BrentB



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PostPosted: Tue Aug 23, 2016 4:09 pm    Post subject: Reply with quote

Do you have a fuel tank selector valve ?
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thataway



Joined: 02 Nov 2003
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PostPosted: Tue Aug 23, 2016 4:20 pm    Post subject: Reply with quote

Switch fuel hoses temporally, if you can. See what happens. lots of places air can get into the line. Any connections, the in and out of filter, O rings, etc are all suspect all of the way to anti siphon valves---lets hope its not that--it was on my Tom Cat 255.
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Reddog



Joined: 29 Sep 2015
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City/Region: Friday Harbor
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PostPosted: Tue Aug 23, 2016 4:46 pm    Post subject: Reply with quote

all good info and suggestions.
Last week, while looking for the culprit, I was laying on the rear deck looking at the Port Raycor (engine not running, not underway....) and noticed it pulling air around the thread of the clear bowl and the top of the gas in the bowl "blipping" each time the bubble chased around the threads.
I tightened the bowl slightly and the bubble stopped as did the "blipping".
I have looked at that since and do not see it doing this again.
I may re-seal the fitting at the Raycor, I am inclined to think that is where the issue is.
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tsturm



Joined: 01 Nov 2003
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PostPosted: Tue Aug 23, 2016 6:09 pm    Post subject: Reply with quote

Reddog wrote:
all good info and suggestions.
Last week, while looking for the culprit, I was laying on the rear deck looking at the Port Raycor (engine not running, not underway....) and noticed it pulling air around the thread of the clear bowl and the top of the gas in the bowl "blipping" each time the bubble chased around the threads.
I tightened the bowl slightly and the bubble stopped as did the "blipping".
I have looked at that since and do not see it doing this again.
I may re-seal the fitting at the Raycor, I am inclined to think that is where the issue is.



I Once had similar symptoms with a carbureted Honda BF90.
The fuel hose between Raycor & Squeeze Bulb was collapsing,
restricting flow. Just another place to look?
Good luck on your search.
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