Intermittent cut out and then hard start

am_dew

Chief Petty Officer
Joined
Apr 3, 2005
Messages
417
This past weekend I had a problem with my engine...factory rebuilt Volvo AQ130C (4 cyl) with 150 hours on it... while we were out cruising on the California Delta. We had cruised about 50 miles according to my GPS...a combination of high/medium speed (25-30 mph) in wide open areas and slow going (~1400 rpm) in the many 5 mph "slow zone" areas we came across. While speeding up after going thru a slow zone about 1/3 mile long, the engine suddenly cuts out and dies. I try to restart and it's not starting. I checked to be sure the dual, single barrel carbs were getting gas, and I also checked for spark...all looks good. I figure for some reason, the engine is flooded, so I just let her sit for about 5 minutes and try to start again. I crank the engine and pump the throttle at the same time...it wants to start while the throttle is wide open. It starts and I imemdiately back off on the throttle but it dies. I repeat this a couple times and finally it stays started after slowly backing off the throttle from about 2000 rpm down to idle speed (1000 rpm). We then cruise without issues for quite a few miles and come to another slow zone, where this time the engine cuts out while we are going slow. Again, it would not start unless we let it sit for about 5-10 minutes, and again, once started we cruised just fine afterwards and it was fine the entire way back to the launch ramp where we began our 60 mile journey.<br /><br />This same thing happened last summer, and the engine would die while slowing down after a cruise, and I never did figure out what the problem was nor did I do anything to try and fix it, but this is the first time it has happened this season in which we have accumulated over 30 hours of completely trouble free boating.<br /><br />I am thinking that perhaps a float in one of the carbs is sticking or there is some other problem in at least one of the carbs.<br /><br />Any other ideas or theories?<br /><br />Thanks!
 

AdamB

Petty Officer 1st Class
Joined
Aug 26, 2004
Messages
251
Re: Intermittent cut out and then hard start

Did you say you were getting spark? If not, I'd say the same thing happened to me. It ended up being a faulty ingnition switch. I found this out AFTER having been towed off the ocean. <br /><br />I relaced the switch and all was well. Must have been corroded inside.
 

am_dew

Chief Petty Officer
Joined
Apr 3, 2005
Messages
417
Re: Intermittent cut out and then hard start

Thanks...yes I was getting spark.
 

jim.bresee

Cadet
Joined
Sep 5, 2005
Messages
7
Re: Intermittent cut out and then hard start

I have a similar problem on my Volvo 501b... which uses a 4 barrel holley marine carb.<br /><br />I suspect in my case that I have a sticky float, or leaking needle valve that is letting too much gas flow into the carb throat, flooding the engine.<br /><br />I'm going to rebuild the carb on my boat, probably over the winter. Some people report that if they look into the carb throat immediatly after shutdown, they can 'see' fuel running into the carb... <br /><br />Good luck.<br />Jim
 

Hermyboy3000

Petty Officer 3rd Class
Joined
Jul 25, 2005
Messages
93
Re: Intermittent cut out and then hard start

Hey Bob,<br /><br />This is off topic, but could you possibly upload some bigger pictures of your boat? The avatar you use looks like my Geneva. I was wondering if maybe Delta's and Genevas shared the same mold?
Geneva4web.jpg
<br /><br />Thanks in advance bob!
 

trebor0301

Petty Officer 2nd Class
Joined
Jul 1, 2004
Messages
166
Re: Intermittent cut out and then hard start

I always had that same problem.I would run hard for awhile then I idled thru the no-wake zone.When I would get going again it would do EXACTLY what yours is doing.Try running thru no wake with blower running or motor cover off.It will keep everything cooler.I never have anymore problems.I think it was vapor locking.
 

jaybirdtx

Petty Officer 3rd Class
Joined
Sep 19, 2005
Messages
79
Re: Intermittent cut out and then hard start

Sounds like a problem with the fuel heating up and causing a vapor lock. A simple remedy to this next time it does this, take a wet rag and wrap it around the fuel pump for a bit then see if she''ll start. If so, it's vapor locking.
 
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