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I have a 2001 centurion elite bowrider with a 350 mercruiser.

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Hello I have a 2001...
Hello I have a 2001 centurion elite bowrider with a 350 mercruiser. After driving the boat and then killing it. It will not start right back up unless I leave it sitting for an hour or more. Any help would be appreciated, thanks.
Submitted: 2 years ago.Category: Boat
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Answered in 9 hours by:
5/31/2015
Marine Mechanic: Jason, Marine Mechanic replied 2 years ago
Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 16,996
Experience: Degree in Marine Technology. Gas and diesel marine mechanic.
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Hello my name is ***** ***** am I speaking with?
All Mercruisers are cataloged by serial number, do you have that number? If not, is this a fuel injected or carbureted engine?
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Customer reply replied 2 years ago
I am steven and I'm not around my boat right now to get the serial number but it is fuel injected
Marine Mechanic: Jason, Marine Mechanic replied 2 years ago
Hi Steven do you know if it is multiport injection( MPI ) Or throttle body injection, (TBI).
Have you ever tried to restart it with the throttle all the way forward in neutral?
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Customer reply replied 2 years ago
MPI and ya it didn't make any difference
Marine Mechanic: Jason, Marine Mechanic replied 2 years ago
The engine is loosing either fuel pressure or loosing spark. What needs to happen is the boat has to go out on to the water, the problem needs to be duplicated. And then spark and fuel pressure needs to be checked to see which one the engine is loosing. Once you figure out which it is loosing, then you can work on a why. Is that something you are able to do?
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Customer reply replied 2 years ago
Ya i will check it out in a little bit and get back with you on what happens
Marine Mechanic: Jason, Marine Mechanic replied 2 years ago
What you would want to do as the testing is hook up a fuel pressure gauge and leave it hooked up. Go and run the boat and duplicate the problem. When you shut down, look at the fuel pressure gauge and see if it drops within the first 2 to 3 minutes. After that let it sit and then check it 1/2 hour later and see if it has dropped.
Let me know how you make out.
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Customer reply replied 2 years ago
Thanks for your help but neither fire or or fuel was the problem. The impeller inside the water pump was dry and not pumping enough water so the sensor would shut the boat down after a few degrees above normal running temperature
Marine Mechanic: Jason, Marine Mechanic replied 2 years ago
You still have a problem. You never mentioned to me that you were running hot. But even so, there is no sensor on the engine that would prevent it from starting. That is not the way the ECM and sensors work on the engine.
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Marine Mechanic: Jason, Marine Mechanic replied 2 years ago
Depending on how hot it might me running, the ECM will put the engine into varying degrees of power reduction. You would have anything from 10% to 90% of power available depending on how hot it actually was. But it would still start every time. Does that make sense?
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Customer reply replied 2 years ago
Makes sense but already put new impeller on and it's running like a champ so problem fixed
Marine Mechanic: Jason, Marine Mechanic replied 2 years ago
That doesn't make any sense. But I am glad to hear you are up and running again.
Happy boating!
Jason
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Customer reply replied 2 years ago
Ya it wasn't gettin very much over normal running temperature so I didn't think it was gettin hot. Only thing I can think of is previous owner must have installed an after market cutoff for the motor and must be extremely sensitive
Marine Mechanic: Jason, Marine Mechanic replied 2 years ago
If you have any contact with the previous owner you might want to call him and ask if he did anything like that. These are sophisticated engines and they do have protection modes as part of them. If the previous owner did something to alter the way the protection mode works that might cause an issue in the opposite direction. For example, if you ever have say a low oil pressure issue, which is really bad, the protection system might not work as its designed to. And that would cause big problems. So if you can, I would definitely try to find out if the previous owner did any "tinkering" to the engine.
I do want to make sure you are happy with the service I am providing to you before you go. Did you have any other questions on the engine or do you think that covers it? --Jason
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Jason, Marine Mechanic
Category: Boat
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