loss of power and shut down of engine
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=31668
Printed Date: October-08-2024 at 5:21pm
Topic: loss of power and shut down of engine
Posted By: Tom
Subject: loss of power and shut down of engine
Date Posted: September-29-2013 at 11:31am
Dear all,
I just bought my first boat which has an Indmar 351 engine. Unfortunately, i have some problems which i haven't been able to solve yet. I have replaced the carburator (second hand though), the starting enginge and the coil. When the boat has to pull a heavier skier, it gets the skier out of the water but, the engine suddenly shuts down after a few minutes of skiing. While pulling the skier, i notice that the engine doesn't have as much power as it should have. The strange thing is that we can ski a whole morning with slightly lighter skiers.
Does anyone have some suggestions as to what could be wrong?
Could it be that something is wrong with the carburator?
Or could it be the cylinder head gasket (loss of compression)? Although i doubt it could be the cylinder head gasket because there is no water in the oil.
Thanks a lot,
Tom
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Replies:
Posted By: SNobsessed
Date Posted: September-29-2013 at 1:38pm
You may want to check the fuel line / filter for blockage. It is common for the anti siphon valve (elbow on top of fuel tank) to clog.
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“Beer is proof that God loves us and wants us to be happy.”
Ben Franklin
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Posted By: Hollywood
Date Posted: September-29-2013 at 9:32pm
If you suspect low compression (which I don't) simply do a compression test.
Did the boat perform the same with the previous carburetor?
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Posted By: Tom
Date Posted: September-29-2013 at 9:41pm
With the previous carborator, the boat would shut down much faster. The carb. was very dirty and the valves did not open and close smoothly anymore. It also kept dripping fuel. So if the same problem was present then, we didn't notice because of all the other problems we were having.
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Posted By: Bri892001
Date Posted: September-30-2013 at 7:12pm
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How does it do wide open throttle with no skiers?
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Posted By: Tom
Date Posted: October-01-2013 at 5:42pm
wide open throttle without skiers, the engine also shuts down the same way as it does with a heavier skier at lower speed.
I also checked the anti siphon valve and this was in good condition. Just to be sure, i cleaned it in an ultrasonic bath in a fuel cleaner solution.
This weekend, i will connect an external fuel tank to the boat to check if the filter inside the tank might be the problem.
Does anyone how the filter inside the fuel tank looks like?
thanks!
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Posted By: Hollywood
Date Posted: October-01-2013 at 5:46pm
We don't know what kind of boat/tank you have, probably not any kind of filter in there anyway.
Get a fuel pressure reading.
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Posted By: Tom
Date Posted: October-01-2013 at 6:08pm
I have a Ski centurion Tru Trac 2.
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Posted By: oldcuda
Date Posted: October-01-2013 at 10:44pm
Posted By: Tom
Date Posted: October-06-2013 at 7:51am
Hey all,
we finally found the problem: it is the fuel pump!
We tested our boat with an external fuel tank and a manual pump. When the boat started to drop in rpm's, (which is the sign the boat is about to shut down) we could avoid the engine shutting down by pumping manually fuel into the carb.
Thank you all for your help! it is very much appreciated!
Cheers,
Tom
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Posted By: OrlandoGuy82
Date Posted: October-21-2013 at 5:28pm
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I had this same issue with my GT-40 Sport. There is a tube going down into the tank and at the top of it was a little mesh filter. The crud got up the tube and clogged it. I blew out the wad of crud and runs perfect now. Of course this means I need to take the tank out and clean it.
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